TWI739838B - Ceramic lattice body - Google Patents

Abstract

The present invention provides a ceramic lattice body with high strength and excellent peeling resistance. The ceramic lattice body (1) has a plurality of first line portions (10) and a plurality of second line portions (20). The first line part (10) is a convex curve part (10B) whose cross-section is outside the intersection (2) and has a straight part (10A) and both ends of the straight part (10A) as the ends. The shape of the composition. The second line portion (20) has a circular or elliptical shape in a cross section outside the intersection (2). Observed in the longitudinal section of the intersection (2), the first line part (10) and the second line part (20) are only the top and the first line part (10) of the convex curve part (10B) in the first line part (10). 2 The circular or elliptical shape in the line part (20) is in contact with the top of the downward protrusion.

Description

Ceramic lattice body

The present invention relates to a lattice body made of ceramics.

When calcining electronic parts or glass made of ceramics, the calcined object is usually placed on a shelf or backing plate, which is also called a setter, and then calcined. In order to shorten the degreasing and calcining time of the calcined object and increase the number of production per unit time, the calcining step needs to be quenched and quenched. Regarding the previous ceramic bracket, if it is quenched and/or quenched, Defects such as cracks are prone to occur. In addition, defects such as cracks are likely to occur due to repeated use. In addition, in the case of using a metal bracket, it is pointed out that it cannot be used in an oxidizing gas atmosphere, or that it will be greatly deformed if it is repeatedly used in a high temperature region above 1200°C.

As a prior art related to ceramic brackets, the following brackets for thermoforming processing are known which are composed of a porous plate made of ceramics mainly composed of aluminum nitride, for example, and have a penetrating front surface and a back surface. Multiple holes (refer to Patent Document 1). According to the document, by using aluminum nitride as ceramics, the highest temperature that can be used is higher than that of oxide ceramics represented by alumina or magnesia, and the thermal conductivity is also greater. Therefore, it is considered to be The resistance to the thermal shock of rapid heat or cold becomes greater.

Patent Document 2 describes a kiln furniture plate for ceramic firing in which at least the front side and the back side on which the object to be fired is placed are provided with uneven shapes and formed with openings. It is described in this document that the kiln furniture plate can reduce the heat capacity and reduce the cost, and the contact area with the calcined material is reduced, so that the gas leakage is improved, and the gas atmosphere It is homogenized and the calcined object can be manufactured uniformly.

Prior art literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 6-207785

Patent Document 2: EP2251628A1

However, even if the techniques described in the above-mentioned patent documents are used, it is not easy to prevent the bracket from cracking during rapid heating and cooling of the calcined object to a satisfactory level.

Therefore, the subject of the present invention is to provide a ceramic lattice body that can eliminate the various shortcomings of the above-mentioned prior art.

The present invention provides a ceramic lattice body having a plurality of first line portions made of ceramics extending in one direction and a plurality of second line portions made of ceramics extending in a direction intersecting the first line portions, And regarding the intersection of the first line part and the second line part, at any of the intersections, the second line part is arranged on the first line part. At the intersection, the first line part has a cross-section A shape consisting of a straight part and a convex curved part with both ends of the straight part as the end. At the intersection, the second line part has a circular or elliptical cross-section, and is at the intersection. When viewed in the longitudinal section of the part, the first line part and the second line part are only the top of the convex curve part in the first line part and the circular or elliptical downward protrusion in the second line part. The top contact.

Furthermore, the present invention provides a ceramic lattice body having ceramics extending in one direction A plurality of first line parts made by the system, and a plurality of second line parts made of ceramics extending in the direction intersecting the first line part, and the intersection of the first line part and the second line part, any One of the intersections has a second line section arranged on the first line section, and the first line section has a straight line section and both ends of the line section as the ends. The second line part is a circular or elliptical shape in a section other than the above-mentioned intersection, and the second line part is a projected image in a plan view at the above-mentioned intersection. A shape that is curved and bulged toward the outside in the width direction, whereby the width of the projected image at the intersection becomes larger than the width of the projected image at parts other than the intersection.

1: Ceramic lattice body

1': 1st grid body

1": 2nd grid body

1A: Ceramic lattice body

1a: The first side of ceramic lattice body 1

1b: The second side of ceramic lattice body 1

2: Intersection

3: Through hole

3a: side 1

3b: second side

10: The first line part

10': 1st line part

10": The first line part

10A: Straight line

10a: The first side of the first line part 10

10B: Curved part

10b: The second surface of the first line part 10

11: Roughly straight line (curve)

20: 2nd line part

20': 2nd line part

20": 2nd line part

20a: The first side of the second line part 20

20b: The second side of the second line part 20

21: Roughly straight line (curve)

30: corner

33: 3rd line part

P: plane

P1: Pitch

P2: Pitch

S: Space

T1: thickness

T2: thickness

Tc: thickness

W1: width

W1a: width

W1b: width

W2: width

W2a: width

W2b: width

X: direction

Y: direction

Fig. 1(a) is a perspective view showing an embodiment of the ceramic lattice body of the present invention, and Fig. 1(b) is a perspective view of the ceramic lattice body shown in Fig. 1(a) viewed from the opposite side.

Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1.

Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1.

Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 1.

Fig. 5 is a sectional view taken along the line V-V in Fig. 1;

Fig. 6 is a projection view of the vicinity of the intersection as viewed from the side of the second line in the ceramic lattice body shown in Fig. 1.

Fig. 7 is a projection view of the vicinity of the intersection as viewed from the side of the first line in the ceramic lattice body shown in Fig. 1.

Fig. 8 is a schematic diagram showing the shape of the through hole in the ceramic lattice body shown in Fig. 1.

Fig. 9(a) is a perspective view showing another embodiment of the ceramic lattice body of the present invention, and Fig. 9(b) is a perspective view of the ceramic lattice body shown in Fig. 9(a) viewed from the opposite side.

Fig. 10 is a cross-sectional view taken along line IIIa-IIIa in Fig. 9.

Fig. 11 is a projection view of the vicinity of the intersection as viewed from the side of the second line in the ceramic lattice body shown in Fig. 9.

Fig. 12 is a cross-sectional view taken along line IVa-IVa in Fig. 9.

Fig. 13 is a projection view of the vicinity of the intersection as viewed from the side of the first line in the ceramic lattice body shown in Fig. 9.

Fig. 14 is a schematic view showing the shape of the through hole in the ceramic lattice body shown in Fig. 9.

Fig. 15(a) and Fig. 15(b) are schematic diagrams respectively showing another embodiment of the ceramic lattice body of the present invention.

Fig. 16 is a schematic view showing still another embodiment of the ceramic lattice body of the present invention.

Hereinafter, the present invention will be described based on the preferred embodiments of the present invention while referring to the drawings. In Fig. 1(a) and Fig. 1(b), one embodiment of the ceramic lattice body of the present invention is shown. The ceramic grid body (hereinafter also referred to as "grid body") 1 shown in these figures has a plurality of first line portions 10 made of ceramics extending in one direction X. The respective first line portions 10 extend in a straight line and parallel to each other. In addition, the ceramic lattice body 1 has a plurality of second line portions 20 made of ceramics extending in a direction different from the X direction, that is, the Y direction. The respective second line portions 20 are linear and extend parallel to each other. Since the X direction and the Y direction are different directions, the first line portion 10 and the second line portion 20 intersect. The crossing angle of the two line parts 10 and 20 can be set according to the specific use of the ceramic lattice body 1. For example, the intersection angle of the second line part 20 can be set to 90 degrees with respect to the first line part 10. Alternatively, the intersection angle of the second line portion 20 with respect to the first line portion 10 can be set to Change within the range of 90°±10°. The lattice body 1 is formed by crossing a plurality of first line portions 10 and a plurality of second line portions 20.

The ceramic grid body 1 forms a grid by intersecting the first line portions 10 and the second line portions 20, and has a plate shape having a plurality of through holes 3 divided and formed by the grid. As shown in Fig. 2, the ceramic lattice body 1 has a first surface 1a and a second surface 1b facing the first surface 1a.

The ceramic lattice body 1 has an intersection portion 2 at a location where each first line portion 10 and each second line portion 20 intersect. The intersection 2 is a part where the first line part 10 and the second line part 20 overlap in the projected image of the ceramic grid body 1 in a plan view.

The first line part 10 has a fixed width W1 in a plan view at a position other than the intersection 2 of the two line parts 10 and 20 (refer to FIG. 2). The cross-sectional shape of the first line portion 10 along the thickness direction in the direction orthogonal to the longitudinal direction is as shown in FIGS. , And the second surface 10b located on the second surface 1b side of the ceramic lattice body 1 is divided and formed. In detail, the first line portion 10 has a cross section along the thickness direction in a direction orthogonal to the longitudinal direction and has a straight portion 10A at a location other than the intersection 2 and ends with both ends of the straight portion 10A. The convex part of the curved part 10B constitutes the shape. As a result, the cross section of the first surface 10a of the first line portion 10 in the thickness direction of the line portion 10 becomes a flat surface. The flat surface is substantially parallel to the in-plane direction of the ceramic lattice body 1. On the other hand, the cross section of the second surface 10b of the first line portion 10 in the thickness direction of the line portion 10 has a convex curved surface shape from the first surface 1a of the ceramic lattice body 1 toward the second surface 1b.

Similar to the first line part 10, the second line part 20 also has a fixed width W2 in a plan view at a position other than the intersection 2 of the two line parts 10 and 20 (refer to FIG. 5). The width W2 may be the same as the width W1 of the first line portion 10, or may be different. The second line part 20 has a cross-sectional shape along the thickness direction in a direction orthogonal to its longitudinal direction, as shown in FIGS. 4 and 5, and is located on a ceramic grid The first surface 20a on the side of the first surface 1a of the sub-body 1 and the second surface 20b on the side of the second surface 1b of the ceramic lattice body 1 are partitioned and formed. The first surface 20a of the second line portion 20 has a convex curved surface shape from the second surface 1b of the ceramic lattice body 1 toward the first surface 1a. On the other hand, the cross section of the second surface 20b of the second line portion 20 in the thickness direction of the line portion 20 has a convex curved surface shape from the first surface 1a of the ceramic lattice body 1 toward the second surface 1b. The curved surface shape may be the same as or different from the curved surface shape in the first line portion 10. In this embodiment, the first surface 20a and the second surface 20b of the second line portion 20 are symmetrical. As a result, the cross section of the second line portion 20 along the thickness direction in the direction orthogonal to the longitudinal direction The shape becomes round or oval.

As shown in FIGS. 3 and 4, when the linear portion 10A of the first line portion 10, that is, the first surface 10a is placed on the plane P as the placement surface, all the first surfaces 10a are located on the plane P . Since the first surface 10a constitutes the first surface 1a of the ceramic lattice body 1, the fact that all the first surfaces 10a are located on the plane P means that the first surface 1a of the lattice body 1 is a flat surface. Therefore, when the ceramic lattice body 1 is placed such that its first surface 1a is in contact with a flat placing surface, the entire area of the first surface 1a is in contact with the placing surface.

As shown in FIG. 3, when the linear portion 10A of the first line portion 10, that is, the first surface 10a is placed on the plane P as the placement surface, the second line portion 20 is formed at two adjacent intersections. A shape separated from the plane P between the parts 2. Therefore, a space S is formed between the second line portion 20 and the plane P between two adjacent intersections 2.

On the other hand, the second surface 1b of the ceramic lattice body 1 is constituted by the second surface 20b of the second line portion 20 in the shape of a convex curved surface as shown in FIG. noodle.

In the intersection part 2 of the first line part 10 and the second line part 20 in the ceramic lattice body 1, the two line parts 10 and 20 are integrated. The so-called "integration" means that when observing the cross section of the intersection 2, the two lines The parts 10 and 20 form a continuous structure in the form of ceramics. The through holes 3 formed in the ceramic lattice body 1 by the intersection of the two line portions 10 and 20 have the same size and the same shape. Each through hole 3 has a substantially rectangular shape. The through holes 3 are regularly arranged.

As shown in Figure 1, Figure 3 and Figure 4, regarding the intersection 2 of the first line portion 10 and the second line portion 20, at any intersection 2, the second line is arranged on the first line portion 10部20。 Section 20. That is, at the intersection 2 of the first line portion 10 and the second line portion 20, the first line portion 10 located on the side of the first surface 1a opposite to the two surfaces 1a and 1b of the lattice body 1 is arranged The second line portion 20 located opposite to the second surface 1b side. Furthermore, the thickness at the intersection 2 is greater than any one of the thickness of the first line section and the thickness of the second line section at locations other than the intersection. That is, the thickness of the first line part 10 at a position other than the intersection 2 of the two line parts 10 and 20 is set to T1 (refer to FIG. 2), and the position other than the intersection 2 of the two line parts 10 and 20 When the thickness of the upper second line portion 20 is set to T2 (refer to FIG. 5), and the thickness at the intersection is set to Tc (refer to FIGS. 3 and 4), Tc>T1 and Tc>T2. Therefore, in the second surface 1b of the ceramic lattice body 1, the position of the intersection of the two linear portions 10, 20 is the highest. Furthermore, the thickness Tc of the intersection 2 is also the thickness of the ceramic lattice body 1.

As shown in FIG. 4, with regard to the first line portion 10, at locations other than the intersection 2, the highest position of the second surface 10b in the first line portion 10, that is, the top position extends along the first line portion 10 The same direction. Regarding the second line portion 20, as shown in FIG. 3, the highest position of the second surface 20b in the second line portion 20 is either the position of the intersection 2 or the position other than the intersection 2, which becomes along Positions where the directions in which the first line portion 10 extends are the same as each other. The lowest position of the first surface 20a in the second line portion 20 is a position other than the intersection 2 and becomes the same position along the direction in which the second line portion 20 extends.

As shown in FIGS. 3 and 4, when the intersection 2 of the ceramic lattice body 1 is viewed in longitudinal section, the first line part 10 and the second line part 20 are only the convex curved part 10B in the first line part 10 Top and second The top of the circular or elliptical convex curve in the line portion 20, that is, the top of the first surface 20a, is in contact with each other. In other words, the first line portion 10 and the second line portion 20 are in a state of point contact or surface contact close to point contact. As a result of research conducted by the inventors, it was found that when the first line portion 10 and the second line portion 20 are in such a contact state, the spalling resistance of the ceramic lattice body 1 is improved. It is considered that the reason is that the first line part 10 and the second line part 20 are in point contact or close to the surface contact and are joined, so that the two line parts 10 and 20 are not easily joined to the same place excessively. Therefore, it is possible to relax The volume change caused by rapid heating and/or cooling. From this point of view, the intersection 2 is in a point contact state to the extent that its thickness Tc is relative to the thickness T1 of the first line portion 10 at a position other than the intersection 2 and the first line at a position other than the intersection 2. The sum of the thickness T2 of the line portion 20, that is, (T1+T2), is preferably 0.5 or more and 1.0 or less, more preferably 0.8 or more and 1.0 or less, and more preferably 0.9 or more and 1.0 or less.

The ceramic lattice body 1 of this embodiment is composed of a layer of first line portions 10 and a layer of second line portions 20. The ceramic lattice body 1 is composed of n layers of first line portions 10 and m layers of second line portions 20 In the case (n and m are each independently an integer of 1 or more, where n and m are not at the same time 1), the intersection 2 becomes a point contact state to the extent that the thickness T of the ceramic lattice body 1 is relative to ( nT1+mT2) is preferably 0.5 or more and 1.0 or less, more preferably 0.8 or more and 1.0 or less, and more preferably 0.9 or more and 1.0 or less.

In order to make the first line portion 10 and the second line portion 20 into a state of point contact or surface contact close to point contact, the ceramic lattice body 1 may be manufactured, for example, by the following method.

As shown in Fig. 1(a) and Fig. 6, the width W2a of the projected image in plan view at the intersection 2 of the second line portion 20 is approximately the same as the width W2b of the projected image in plan view at locations other than the intersection 2. Or slightly larger than W2b. In detail, regarding the second line portion 20, (i) the contour along the longitudinal direction of the projected image in a plan view becomes approximately straight lines 21 and 21 at the intersection 2 or (ii) is drawn toward the wide A very gentle convex curve (not shown) on the outer side of the degree direction X. In the case of (ii), the contour along the length of the projected image of the second line portion 20 in the plan view includes the largest width portion with a width W2a. As it moves away from the largest width portion, the width gradually decreases. The position between the intersections 2 is the width W2b. The width W2b is the same as the width W2 described earlier. W2a is preferably 1 time or more and 1.5 times or less of W2b, more preferably 1 time or more and 1.3 times or less, and more preferably 1 time or more and 1.1 times or less.

On the other hand, the first line portion 10 is the width W1a of the projected image in the plan view at the intersection 2 and the projected image in the plan view at the location other than the intersection 2 as shown in Figs. 1(b) and 7 The width W1b is approximately the same or slightly larger than W1b. In detail, with regard to the first line portion 10, (i) the contour along the longitudinal direction of the projected image in a plan view becomes approximately straight lines 11 and 11 at the intersection 2, or (ii) it is drawn to the outside of the width direction Y. A gentle convex curve (not shown). In the case of (ii), the outline along the length of the projected image of the first line portion 10 in the plan view includes the largest width portion with the width W1a. As it moves away from the largest width portion, the width gradually decreases. The position between the intersections 2 becomes the width W1b. The width W1b is the same as the width W1 described earlier. W1a is preferably 1 time or more and 1.5 times or less of W1b, more preferably 1 time or more and 1.3 times or less, and more preferably 1 time or more and 1.1 times or less.

In FIG. 8, a top view of the ceramic lattice body 1 is shown. As shown in the figure, in the lattice body 1, a plurality of first line portions 10 and a plurality of second line portions 20 are substantially orthogonal to each other, and in a plan view of the lattice body, a plurality of substantially rectangular shapes are formed Through hole 3. The through hole 3 constituting a substantially rectangular shape has first sides 3a and 3a as a set of sides facing each other. At the same time, the through hole 3 has the second side 3b, 3b which is another set of opposite sides. The first sides 3a and 3a are sides corresponding to the side edges of the first line portion 10. On the other hand, the second sides 3b and 3b are sides corresponding to the side edges of the second line portion 20. The through hole 3 is delimited by these four sides. The opposing first sides 3a, 3a become straight lines and extend parallel to each other stretch. Similarly, the opposing second sides 3b and 3b also become straight lines and extend parallel to each other. Furthermore, the first line portion 10 and the second line portion 20 have the above-mentioned substantially linear shape at the intersection 2 thereof, whereby the through hole formed by the first line portion 10 and the second line portion 20 is substantially orthogonal 3 As shown in the schematic diagram of FIG. 8, the corner 30 is a rectangle with a substantially right angle.

When the ceramic lattice body 1 having the above-mentioned structure is used as a bracket for firing, for example, if the body to be fired is placed on the first surface 1a of the lattice body 1, the first surface 1a is a flat surface, so it is suitable for mounting a calcined body that requires flatness. Examples of the to-be-fired body that requires flatness include small chip-shaped electronic components such as multilayer ceramic capacitors. These small electronic parts must not be caught by the bracket during the firing step, so it is advantageous that the first surface 1a of the lattice body 1 is flat. In addition, since the body to be calcined is only in contact with the first line portion 10, which is the member constituting the first surface 1a, the contact area between the lattice body 1 and the body to be calcined is greatly reduced, thereby facilitating rapid heating of the body to be calcined And cooling. In addition, the grid body 1 is formed by the intersection of the first and second line portions 10 and 20, and a plurality of through holes 3 are formed. Therefore, the heat capacity is small. In this respect, the sintered body is easy to be calcined. Rapid heating and cooling. Furthermore, the grid body 1 has good air permeability due to the presence of a plurality of through holes 3, and therefore, it is also easy to perform rapid cooling of the body to be calcined. The good air permeability becomes more remarkable by floating the second line portion 20 between the adjacent intersections 2 with each other. In addition, in the grid body 1, since the first and second line portions 10 and 20 are integrated in the intersection portion 2, they have sufficient strength.

On the other hand, it is advantageous to place a calcined body in the order of millimeters on the second surface 1b of the lattice body 1. The reason is that the second surface 1b is a concave-convex surface formed by the curved surface of the second line portion 20. For electronic parts of this level, having concave-convex systems on the surface on which it is placed is advantageous from the viewpoint of improving degreasing properties. .

In this way, the lattice body 1 of the present embodiment has a flat surface on one side and an uneven surface on the other side. Therefore, it is advantageous in that the mounting surface can be distinguished and used according to the type of the calcined body.

From the viewpoint of making the aforementioned various advantageous effects more remarkable, the value of T1 is preferably 50 μm or more and 5 mm or less, and more preferably 200 μm or more and 2 mm or less. On the other hand, the value of T2 is preferably 50 μm or more and 5 mm or less, and more preferably 200 μm or more and 2 mm or less. The relationship between the values of T1 and T2 is not particularly limited, and it can be T1>T2, or vice versa, T1<T2, or T1=T2.

From the same viewpoint, the thickness Tc at the intersection portion 2 is preferably 0.5 or more and 1.0 or less with respect to (T1+T2), preferably 20 μm or more and 5 mm or less, and more preferably 50 μm or more and 2 mm or less.

In addition, when the cross-sectional shape in the thickness direction of the second line portion 20 (refer to FIG. 5) is elliptical, in terms of smooth placement of the calcined body, the minor axis of the ellipse is preferred It is consistent with the thickness direction of the grid body 1, and the long axis of the ellipse is consistent with the plane direction of the grid body 1. In this case, the ratio of the major axis/minor axis is preferably 1 or more and 5 or less, and more preferably 1 or more and 3 or less. Moreover, the cross-sectional shape in the thickness direction of the second line portion 20 being elliptical or circular also contributes to the improvement of the strength of the lattice body 1.

Regarding the through holes 3 formed in the ceramic lattice body 1, in terms of reducing the heat capacity of the lattice body 1, or improving the air permeability, and maintaining the strength of the lattice body 1, the area is preferably 100 μm ² More than and 100 mm ² or less, especially 2500 μm ² or more and 1 mm ² or less. In addition, the ratio of the total area of the through holes 3 in a plan view to the apparent area of the ceramic lattice body 1 is preferably 1% or more and 80% or less, more preferably 3% or more and 70% or less, and more preferably Above 10% and below 70%. The ratio is calculated by cutting out a rectangle of any size from a plan view of the ceramic lattice body 1, and calculating the total area of the through holes 3 included in the rectangle, dividing the total by the area of the rectangle and multiplying by 100. In addition, the area of each through hole 3 can be measured by image analysis of a microscope observation image of the lattice body 1.

In relation to the area of the through hole 3, the width W1 of the first line portion 10 is preferably 50 μm or more and 10 mm or less, and more preferably 75 μm or more and 1 mm or less. On the other hand, the width W2 of the second line portion 20 is preferably 50 μm or more and 10 mm or less, and more preferably 75 μm or more and 1 mm or less. There is no particular restriction on the magnitude relationship between the values of W1 and W2, and it can be W1>W2, or vice versa, W1<W2, or W1=W2.

In relation to the widths W1 and W2 of the first and second line portions 10 and 20, the distance P1 between adjacent first line portions 10 is preferably 100 μm or more and 10 mm or less, and more preferably 150 μm or more and 5 mm the following. On the other hand, the distance P2 between the adjacent second line portions 20 is preferably 100 μm or more and 10 mm or less, and more preferably 150 μm or more and 5 mm or less.

The first line portion 10 preferably has a smooth first surface 10a in its surface. Since the first surface 10a of the line portion 10 is smooth, there is an advantage that when the body to be burned is placed on the ceramic lattice body 1, it is not easy to damage the body to be burned. In addition, it also has the advantage that the calcined body obtained by the calcining of the calcined body is not easily caught in the ceramic lattice body 1, and the extractability is good. Furthermore, if the calcined body is a thin-walled sheet-shaped body such as a substrate, the surface condition of the first surface 10a is transferred to the bottom surface of the calcined body, so there is an advantage that the bottom surface of the calcined body can be easily completed smoothly. On the other hand, if the surface roughness is large, the flow of the gas under the calcined body becomes better when the calcined body is placed, so it has the advantage that degreasing can easily progress smoothly. From these viewpoints, the surface roughness Ra of the first surface 10a of the first line portion 10 is preferably 0.01 μm or more and 10 μm or less, and more preferably 0.01 μm or more and 5 μm or less. On the other hand, the surface roughness Ra of the second surface 20b of the second line portion 20 is preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less. The surface roughness Ra is specifically for the use of color 3D laser microscopes (e.g. Keyence (KEYENCE) VK-8710 manufactured by (Stock)) The profile curve obtained by scanning with the photographic magnification set to 200 times, the value of the centerline surface roughness calculated in accordance with JIS B0601 (2001). Regarding the first surface 10a of the first line portion 10, the surface roughness was measured along the center line of the first surface 10a, and the average value was calculated from 20 measured values, and it was set as Ra. On the other hand, on the second surface 20b of the second line portion 20, the surface roughness was measured along the center line of the second surface 20b, and the average value was calculated from the 20 measured values, and set as Ra.

In order to reduce the value of the surface roughness Ra of the first surface 10a of the first line portion 10 and the second surface 20b of the second line portion 20, for example, as long as the surface roughness is smaller as the coating for forming The substrate of the paste of the line portion, or the paste with low viscosity may be used as the paste. On the other hand, in order to increase the value of the surface roughness Ra of the first surface 10a of the first line portion 10 and the second surface 20b of the second line portion 20, for example, as long as the paste has a high viscosity, Or increase the diameter of the nozzle through which the paste is ejected. Depending on the situation, the first surface 1a and/or the second surface 1b of the ceramic lattice body 1 may be polished to obtain a specific surface roughness.

As the ceramic material constituting the ceramic lattice body 1, various ceramic materials can be used. For example, aluminum oxide, silicon carbide, silicon nitride, zirconium oxide, mullite, zircon, cordierite, aluminum titanate, magnesium titanate, magnesium oxide, titanium diboride, boron nitride, etc. can be cited. These ceramic materials can be used alone or in combination of two or more. It is particularly preferable to include ceramics containing alumina, mullite, cordierite, zirconia or silicon carbide. In the case of using ceramics containing zirconia, in order to make the lattice body 1 more suitable for use under high-temperature calcination, zirconia which is completely stabilized by adding yttrium oxide or the like can be used. When the ceramic lattice body 1 is rapidly heated and cooled, it is particularly preferable to use silicon carbide as the ceramic material. Furthermore, since silicon carbide may react with the calcined body, when silicon carbide is used as a ceramic material, it is preferable to coat the surface with a ceramic material with low reactivity such as zirconia. As the raw material powder of the ceramic material constituting the lattice body 1, if it is considered to be made In the case of a paste, it is preferable to use those having a particle size of 0.1 μm or more and 200 μm or less for viscosity or sinterability. The ceramic material constituting the first line portion 10 and the ceramic material constituting the second line portion 20 may be the same or different. From the viewpoint of improving the integration of the first and second line portions 10 and 20 at the intersection 2, it is preferable that the ceramic materials constituting the two line portions 10 and 20 are the same.

The inventor’s research results revealed that in terms of improving the strength of the ceramic lattice body 1 and further improving the peeling resistance, except that the first line portion 10 and the second line portion 20 are in point contact at the intersection 2 of them. In addition, it is advantageous that both the first line portion 10 and the second line portion 20 include ceramics in which two or more types of crystal phases are mixed. The so-called ceramics formed by a mixture of two or more types of crystalline phases are composed of a single material. Ceramics have two or more types of crystalline phases. The types of two or more crystal phases are not particularly limited. In terms of further improving the strength of the ceramic lattice body 1 and further improving the peeling resistance, in particular, the first line portion 10 and the second line portion 20 both contain a local stabilization formed by a mixture of tetragonal crystals and cubic crystals. Zirconia is more advantageous. In order to stabilize zirconia locally, tetragonal crystals and cubic crystals are mixed, for example, yttrium oxide may be added to zirconia. Regarding the addition amount of yttrium oxide, the sum of the molar numbers of Zr and Y may exceed 0 mol% and not reach 8 mol%.

Next, a preferable manufacturing method of the ceramic lattice body 1 of this embodiment will be described. In this manufacturing method, the raw material powder of the ceramic material is prepared first, and the raw material powder is mixed with a medium such as water and a binder to prepare a paste for manufacturing the line part.

As the binding agent, the same binding agent as previously used for this paste can be used. Examples include: polyvinyl alcohol, polyethylene glycol, polyethylene oxide, dextrin, sodium and ammonium lignosulfonate, carboxymethyl cellulose, ethyl cellulose, hydroxypropyl methyl cellulose Cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxyethyl methyl cellulose, sodium and ammonium alginate, epoxy resin, phenolic resin, gum arabic, polyvinyl butyral, polyacrylic acid and polypropylene resin Acrylic polymers such as amines; Sanxian gum and guar gum and other thickening polysaccharides; gelatin, agar and pectin and other gelling agents; vinyl acetate resin latex, wax latex, and alumina sol and silica sol and other inorganic adhesives. Two or more of them can also be mixed and used.

Regarding the viscosity of the paste, in terms of smoothly manufacturing the lattice body 1 having the structure of the present embodiment, it is preferable to have a high viscosity at the temperature at the time of coating. In detail, the viscosity of the paste at the coating temperature is preferably 1.5MPa‧s or more and 5.0MPa‧s or less, and more preferably 1.7MPa‧s or more and 3.0MPa‧s or less. The viscosity of the paste is measured at 4 minutes after the start of the measurement using a cone-plate rotary viscometer or rheometer at a speed of 0.3 rpm.

The ratio of the raw material powder of the ceramic material in the paste is preferably 20% by mass or more and 85% by mass or less, and more preferably 35% by mass or more and 75% by mass or less. The ratio of the medium in the paste is preferably 15% by mass or more and 60% by mass or less, and more preferably 20% by mass or more and 55% by mass or less. The ratio of the binder in the paste is preferably 1% by mass or more and 40% by mass or less, and more preferably 5% by mass or more and 25% by mass or less.

In the paste, it may contain viscosity increasing agents, flocculants, thixotropic agents, etc. as viscosity modifiers. Examples of thickening include: polyethylene glycol fatty acid esters, alkyl allyl sulfonic acid, alkyl ammonium salts, ethyl vinyl ether-maleic anhydride copolymer, smoked silica, white Protein and other proteins. In most cases, the bonding agent has a thickening effect, so it is sometimes classified as a thickening agent. However, when stricter viscosity adjustment is required, a thickening agent that is not classified as a bonding agent can be used. Examples of the flocculant include polyacrylamide, polyacrylate, aluminum sulfate, polyaluminum chloride, and the like. As an example of a thixotropic agent, fatty acid amide, oxidized polyolefin, polyether ester type surfactant, etc. are mentioned. As a solvent for preparing the paste, in addition to water, alcohol, acetone, ethyl acetate, etc. may also be used, and two or more of these solvents may be mixed. In addition, in order to stabilize the discharge amount, plasticizers, lubricants, dispersants, precipitation inhibitors, pH adjusters, etc. may be added. Examples of plasticizers include glycol systems such as 1,3-propanediol and 1,4-butanediol, glycerin, butanediol, phthalic acid systems, adipic acid systems, phosphoric acid systems, and the like. Examples of lubricants include hydrocarbons such as liquid paraffin, microcrystalline wax, and synthetic paraffin, higher fatty acids, fatty acid amides, and the like. As the dispersant, sodium polycarboxylate or ammonium salt, acrylic acid, polyethyleneimine, phosphoric acid and the like can be mentioned. Examples of precipitation inhibitors include polyamide amine salts, bentonite, aluminum stearate, and the like. Examples of pH adjusters include sodium hydroxide, ammonia, oxalic acid, acetic acid, and hydrochloric acid.

Using the obtained paste, a plurality of lines of the first coating body are formed parallel to each other and linearly on a flat substrate. The line first coating system corresponds to the first line part 10 in the target grid body 1. The first paste, which is the paste for forming the first coating body of the line, contains the first raw material powder of the ceramic material, the medium, and the binder. In order to form the first coating body using the line of the first paste, various coating devices such as a small extruder or a printer can be used.

After the first coating body of the line is formed, the medium is then removed from the first coating body of the line and dried to further increase the viscosity of the first coating body of the line. In order to remove the medium from the first coating body of the line, for example, it is sufficient to blow hot air or irradiate infrared rays to the first coating body of the line. The ratio of the medium in the first coating body of the line after the medium is removed is preferably reduced to 50% by mass or less, and more preferably to 30% by mass or less, so that the viscosity of the first coating body of the line is extremely high and it is guaranteed The shape is further improved.

After removing the medium from the first coating body of the line, a second paste is then used to form a plurality of lines of the second coating body parallel to each other and linearly so as to cross the first coating body of the line . The line second coating system corresponds to the second line part 20 in the target grid body 1. As the second paste, the same composition as the first paste can be used, including the second raw material powder of the ceramic material, the medium, and the binder. For the formation of the second coating body of the line, the same coating device as the first coating body of the line can be used. After the second coating body of the line is formed, it is then removed from the second coating body of the line The medium is dried to further increase the viscosity of the second coating body of the line. This operation can be performed in the same manner as the operation performed on the first coating body of the line. In this way, by sequentially performing the formation of the first coating body of the line and the removal of the medium, and the formation of the second coating body of the line and the removal of the medium, the second line part 20 is smoothly obtained on the first line part 10 Grid body 1.

The lattice-shaped precursor obtained in this way is peeled from the substrate and placed in a calcining furnace to be calcined. By this firing, the target ceramic lattice body 1 is obtained. The calcination can generally be carried out under the atmosphere. The calcination temperature is just to select an appropriate temperature according to the type of the raw material powder of the ceramic material. The same applies to the calcination time.

The target ceramic lattice body 1 is obtained by the above method. The ceramic lattice body 1 is suitable for use as a bracket for degreasing or calcining ceramic products such as shelves or backing plates, and can also be used as kiln furniture other than brackets, such as boxes or beams. Furthermore, it can also be used for purposes other than kiln furniture, such as various jigs such as filters and catalyst carriers, or various structural materials. In this case, the body to be calcined is generally placed on the uneven surface of the lattice body 1 that is the second surface 1b. However, depending on the type of body to be calcined, the body to be calcined can also be placed on the flat surface, that is, the first surface. On 1a. For example, in the case of performing the firing step in the manufacturing process of MLCC (Multi-layer Ceramic Capacitors), it is preferable to place the fired body on the flat surface, that is, the first surface 1a.

According to the present invention, in addition to the ceramic lattice body 1 of the above-mentioned embodiment, the ceramic lattice body 1A of the embodiment shown in FIGS. 9 to 14 is also provided. Regarding the ceramic grid body 1A, the points different from the ceramic grid body 1 described above will be described. Regarding the aspects that are not specifically described, the description related to the ceramic grid body 1 described above is appropriately applied. In addition, with regard to FIGS. 9 to 14, the same components as those in FIGS. 1 to 8 are given the same reference numerals.

As shown in FIGS. 9 to 11, the ceramic grid body 1A has a second line portion 20 whose projected image in a plan view has a shape curved and bulged toward the outside of the width direction X at the intersection 2. Take this, cross The width W2a of the projected image at the part 2 becomes larger than the width W2b of the projected image at parts other than the intersection part 2. In detail, the contour along the longitudinal direction of the projection image of the second line portion 20 in a plan view draws gently convex curves 21, 21 toward the outside of the width direction X at the intersection portion 2. The contour along the length of the projection image of the second line portion 20 in a plan view includes a maximum width portion having a width W2a. As it moves away from the maximum width portion, the width gradually decreases at a position between the intersections 2 It becomes the width W2b. The width W2b is the same as the width W2 described earlier.

On the other hand, as shown in FIGS. 9, 12, and 13, the first line portion 10 has a projected image in a plan view that is curved and bulged toward the outside of the width direction Y at the intersection 2. As a result, the width W1a of the projected image at the intersection 2 becomes larger than the width W1b of the projected image at locations other than the intersection 2. In detail, the contour along the longitudinal direction of the projection image of the first line portion 10 in a plan view is drawn at the intersection 2 with gently convex curves 11 and 11 toward the outside of the width direction Y. The outline along the length of the projection image of the first line portion 10 in a plan view includes a maximum width portion having a width W1a. As it moves away from the maximum width portion, the width gradually decreases at the position between the intersections 2 It becomes the width W1b. The width W1b is the same as the width W1 described earlier.

In FIG. 14, a top view of the ceramic lattice body 1A is shown. As shown in the figure, in the lattice body 1, a plurality of first line portions 10 and a plurality of second line portions 20 are substantially orthogonal to each other, and a plurality of substantially rectangular through-holes are formed in the plan view of the lattice body. Hole 3. The through hole 3 formed in a substantially rectangular shape has first sides 3a and 3a as a set of sides facing each other. At the same time, the through hole 3 has the second side 3b, 3b which is another set of opposite sides. The first sides 3a and 3a are sides corresponding to the side edges of the first line portion 10. On the other hand, the second sides 3b and 3b are sides corresponding to the side edges of the second line portion 20. The through hole 3 is delimited by these four sides. The opposing first sides 3a, 3a are straight lines and extend parallel to each other. Similarly, the opposing second sides 3b and 3b also become straight lines and extend parallel to each other. Moreover, the first line portion 10 and the second line portion 20 have the above-mentioned curved and bulging shape at the intersection 2 thereof. By this, the through hole 3 formed by the first line portion 10 and the second line portion 20 approximately orthogonal to each other becomes a rectangle with corners 30 that are not right-angled. Rectangle of radians.

When the ceramic lattice body 1A having the above configuration is used as a bracket for sintering, for example, the rectangular through-hole 3 has an arc at the corner 30, so that the strength and peel resistance are improved. The reason is that in the ceramic lattice body 1A, the most prone to defects such as cracks are the corners 30 of the through holes 3. Since the corners 30 are curved, the corners 30 are not prone to cracks and the like. In contrast to this, for example, in the kiln furniture board having an opening described in Patent Document 2, the corners of the opening are at right angles, so cracks and the like are likely to occur.

As long as the intersection 2 between the first line portion 10 and the second line portion 20, at least the second line portion 20 has the convex curve 21 along the length of the projection image of the second line portion 20 when viewed from above. The increase in exfoliation will be fully achieved. In particular, if both the first line portion 10 and the second line portion 20 have the above-mentioned convex curves 11 and 21 in the projection image in a plan view along the length direction, the strength and peel resistance will be further improved. .

The ceramic lattice body 1A can be manufactured by the same method as the ceramic lattice body 1 described above. However, when manufacturing the ceramic grid body 1 described above, the medium removal operation is performed after the first coating body of the line and the second coating body of the line are formed. However, when the ceramic grid body 1A is manufactured, the medium removal operation is not required. Thereby, at the intersection of the first coating body of the line and the second coating body of the line, the second coating body of the line moderately sinks into the first coating body of the line, whereby the side edges of the coating bodies Bending and bulging toward the outside in the width direction.

When manufacturing the ceramic lattice body 1A, a paste with relatively low viscosity can also be used. In the case of using a low-viscosity paste, it is preferable to dry the lattice-shaped precursor and remove the liquid form after the lattice-shaped precursor is manufactured and before the lattice-shaped precursor is subjected to the calcination step. Calcination is performed after improving the shape retention of the lattice-shaped precursor. When using a paste with relatively low viscosity, the viscosity at the coating temperature is preferably 10kPa‧s or more and 1.5MPa‧s or less, and more preferably 0.5MPa‧s or more and 1.3MPa‧ s or less.

In this way, a grid-shaped precursor formed by two kinds of line coating bodies was obtained. When the viscosity of the paste used in the manufacture of the grid-shaped precursor is relatively low, it is preferable to dry the grid-shaped precursor to exhibit shape retention. This prevents the second coating body of the line from sinking excessively into the first coating body of the line, and the side edges of the coating bodies are appropriately curved and bulged toward the outside in the width direction. In addition, the second coating body of the line between adjacent intersections is prevented from bending downward due to its own weight, and the bridging state of the second coating body of the line is maintained. Drying is performed, for example, by heating the lattice-shaped precursor at a temperature of 40°C or more and 80°C or less in the atmosphere. The heating time can be set to, for example, 0.5 hour or more and 12 hours or less. When the viscosity of the paste is high, it is not necessary to dry the grid-shaped precursor in most cases. In this case, the grid-shaped precursor can be directly subjected to the calcination step described below.

Above, the present invention has been described based on the preferred embodiments of the present invention, but the present invention is not limited to the above-mentioned embodiments. For example, in the ceramic lattice bodies 1 and 1A of the above-mentioned embodiment, the first line portion 10 and the second line portion 20 intersect in a substantially orthogonal manner, but the crossing angle of the two line portions 10 and 20 is not limited to 90 degrees.

In addition, the ceramic lattice bodies 1 and 1A of the above-mentioned embodiment use two types of line parts of the first line part 10 and the second line part 20, but in addition to this, a third line part (not shown), or Furthermore, there are three or more types of line parts such as the fourth and fifth line parts (not shown). In the case of using more than three types of line parts, the third line part and the subsequent line parts are preferably the same as the first and second lines with respect to the thickness T1, the width W1, and the pitch P1, respectively. The composition of the lines is the same. In addition, regarding the configuration of the intersection formed by the third linear portion and subsequent linear portions, it is also desirable to have It has the same structure as the intersection formed by the first and second line portions as described above.

In addition, the ceramic lattice bodies 1 and 1A of the above-mentioned embodiment have a single-layer structure, but a plurality of the lattice bodies 1 may be used instead, and they may be laminated as shown in Figs. 15(a) and 15(b). Layer and use. In the embodiment shown in FIG. 15(a), the first lattice body 1'including the first line portion 10' and the second line portion 20' and the first line portion 10" and the second line portion 20" The second lattice body 1" is laminated to form lattice bodies 1, 1A. The first line portion 10' in the first lattice body 1'and the first line portion 10" in the second lattice body 1" are at the same pitch Similarly, the second line portion 20' in the first lattice body 1'and the second line portion 20" in the second lattice body 1" are also arranged at the same pitch.

On the other hand, in the embodiment shown in FIG. 15(b), the first line portion 10' in the first lattice body 1'and the first line portion 10" in the second lattice body 1" are staggered by half The way of spacing configuration. Similarly, the second line portion 20' in the first lattice body 1'and the second line portion 20" in the second lattice body 1" are also arranged so as to be shifted by a half pitch.

In the ceramic lattice body 1, 1A of the embodiment shown in FIG. 15(a) and FIG. 15(b), it is preferable that at least the first line portion 10' and the second line portion 20 in the first lattice body 1' 'Point contact at the intersection of them. It is particularly preferable that any set of line parts adjacent to each other up and down are in point contact with each other at their intersections.

As a modification of the embodiment shown in Figs. 15(a) and (b), ceramic lattice bodies 1 and 1A of the embodiment shown in Fig. 16 can be cited. The ceramic lattice bodies 1 and 1A of the embodiment shown in FIG. 16 have, in addition to the first line portions 10 and the second line portions, a plurality of third line portions 33 made of ceramics extending in one direction. In this embodiment, the direction in which the third line portion 33 extends is the same direction as the direction in which the first line portion 10 extends, but instead, the third line portion 33 is inclined with respect to the direction in which the first line portion 10 extends. The direction (specifically, preferably greater than -45° and less than 45°, and more preferably greater than -45° and less than 30°) is inclined. The third line part 33 and the second line The part 20 intersects, and the intersection of the third line part 33 and the second line part 20 is any one of the intersections, the third line part 33 is arranged on the second line part 20. In the present embodiment, the arrangement distance between the third line portion 33 and the first line portion 10 is shifted by a half pitch (0.5 pitch). This embodiment is the best way to prevent the electronic parts from falling from the linear tribe when the electronic parts are placed and fired. However, the present invention is not limited to this embodiment. The stagger of the first line portion 10 and the third line portion 33 can be set to zero (0) or more and less than half pitch (0.5 Spacing) range. In this embodiment, the same effects as the ceramic lattice bodies 1 and 1A of the previous embodiment are also exhibited. Preferably, in the longitudinal cross-sectional view of the intersection of the third line portion 33 and the second line portion 20, the third line portion 33 and the second line portion 20 are only round or elliptical in the third line portion. The top of the lower protrusion is in contact with the top of the upward protrusion of the circle or ellipse in the second line part.

In addition, in order to increase the strength of the ceramic lattice bodies 1, 1A of each of the above embodiments, an outer frame may be provided on the outer circumference of the lattice bodies 1, 1A. The outer frame may be integrally formed with the same material as the lattice bodies 1, 1A, or it may be manufactured separately from the lattice bodies 1, 1A in advance and joined by a specific joining method. In addition, in order to improve the peeling resistance, a slit may be added to a part of the side along the longitudinal direction of the first line portion 10 and/or the second line portion 20 toward the inner side in the width direction. In order to further improve the peeling resistance, each line portion in the ceramic grid body 1 of each embodiment is preferably in a state where the end portion is exposed. State.

Example

Hereinafter, the present invention will be explained in more detail using examples. However, the scope of the present invention is not limited to this embodiment. Unless otherwise specified, "%" and "parts" refer to "mass %" and "parts by mass" respectively.

[Example 1]

In this embodiment, the ceramic lattice body 1 shown in FIGS. 1 to 8 is manufactured.

(1) Preparation of paste for forming line coating body

65.3 parts of locally stabilized zirconia powder with an average particle size of 0.8 μm added with 3 mol% yttrium oxide, 5.0 parts of hydroxypropyl methyl cellulose as a water-based binder (average degree of polymerization: 300,000 g/mol ), 2.5 parts of glycerin as a plasticizer, 1.1 parts of polycarboxylic acid dispersant (molecular weight 12000), and 26.1 parts of water are mixed and defoamed to prepare a paste. The viscosity of the paste is 2.3MPa‧s at 25℃.

(2) Formation of line coating body

Using the above-mentioned paste as a raw material, a dispenser with a nozzle having a diameter of 0.4 mm was used to form a line first coating body on the resin substrate. Then, using a dryer, hot air was blown to the first coating body of the line to remove water, and the first coating body of the line was dried. The water content of the first coating body of the line after drying is 10%. Next, the second coating body of the line intersecting with the first coating body of the line is formed. The crossing angle of the two line coating bodies is set to 90 degrees. The second coating body of the line was blown with hot air using a dryer to remove water, and the second coating body of the line was dried. The water content of the second coating body of the line after drying is 8%. In this way, a lattice-shaped precursor is obtained.

(3) Calcining step

After the dried lattice-shaped precursor is peeled off from the resin substrate, it is placed in an atmospheric calcination furnace. Degreasing and sintering are performed in the calcining furnace to obtain a ceramic lattice body of the shape shown in FIGS. 1 to 8. The calcination temperature was set at 1450°C, and the calcination time was set at 3 hours. In the obtained lattice body, the first line portion and the second line portion are in point contact with each other at their intersections. In the obtained lattice body, the thickness T1 of the first line portion was 400 μm, the thickness T2 of the second line portion was 410 μm, and the thickness Tc of the intersection was 770 μm. Therefore, Tc is 0.95 relative to (T1+T2). The width W1 of the first line portion is 425 μm, and the width W2 of the second line portion is 420 μm. The width W1a of the first line portion at the intersection is 445 μm, and the width W2a of the second line portion is 440 μm. Therefore, W2a is 1.05 times W2b, and W2a and W2b are approximately the same value. The distance P1 between the first line portions is 800 μm, and the distance P2 between the second line portions is 720 μm. The surface roughness Ra of the ceramic lattice body 1 is 0.3 μm on the first surface and 0.4 μm on the second surface. In addition, the area of the through holes in the ceramic lattice body 1 is 0.09 mm ² , and the porosity is 17%.

[Example 2]

In this embodiment, the ceramic lattice body 1A shown in FIGS. 9 to 14 is manufactured.

(1) Preparation of paste for forming line coating body

65.3 parts of fully stabilized zirconia powder with an average particle size of 0.8 μm added with 8 mol% yttrium oxide, 5.0 parts of hydroxypropyl methylcellulose as a water-based binder (average degree of polymerization: 300,000 g/mol ), 2.5 parts of glycerin as a plasticizer, 1.1 parts of polycarboxylic acid dispersant (molecular weight 12000), and 26.1 parts of water are mixed and defoamed to prepare a paste. The viscosity of the paste is 2.3MPa‧s at 25℃.

(2) Formation of line coating body

Using the above-mentioned paste as a raw material, a dispenser having a nozzle with a diameter of 0.4 mm was used to form a line first coating body on the resin substrate, and then a line second coating body intersecting it was formed. The crossing angle of the two line coating bodies is set to 90 degrees. In this way, a lattice-shaped precursor is obtained.

(3) Calcining step

After the dried lattice-shaped precursor is peeled off from the resin substrate, it is placed in an atmospheric calcination furnace. Degreasing and sintering are performed in the calcining furnace to obtain a ceramic lattice body of the shape shown in FIGS. 9 to 14. The calcination temperature was set at 1450°C, and the calcination time was set at 3 hours. The specifications of the obtained lattice body are shown in Table 1 below. In the obtained lattice body, as shown in Fig. 14, the corners of the rectangular through holes are curved.

[Example 3]

Except that the diameter of the nozzle was 0.8 mm, a ceramic lattice body was obtained in the same manner as in Example 2. In the obtained lattice body, as shown in Fig. 14, the corners of the rectangular through holes are curved.

[Example 4]

53.6 parts of fully stabilized zirconia powder with 8 mol% yttrium oxide added with an average particle size of 0.8 μm, 4.1 parts of hydroxypropyl methyl cellulose as a water-based binder (average degree of polymerization: 300,000 g/mol ), 2.0 parts of glycerin as a plasticizer, polycarboxylic acid dispersant (molecular weight 12000), and 39.4 parts of water are mixed and defoamed to prepare a paste. The viscosity of the paste is 1.15 million Pa‧s at 25℃. Using this paste, a grid-shaped precursor was obtained by the same operation as in Example 1. However, the diameter of the nozzle is set to 0.4 mm. While the grid-shaped precursor was dried by a dryer, the coated body was formed by a dispenser. Furthermore, after the coated body was formed, it was dried by a dryer at 60° C. for 12 hours. Except for this, a ceramic lattice body was obtained in the same manner as in Example 2. In the obtained lattice body, as shown in Fig. 14, the corners of the rectangular through holes are curved.

[Example 5]

In Example 4, the diameter of the nozzle was set to 0.8 mm. Except for this, a ceramic lattice body was obtained in the same manner as in Example 3. In the obtained lattice body, as shown in Fig. 14, the corners of the rectangular through holes are curved.

[Example 6]

In Example 2, four types of line parts were used. The four types of line parts are layered in the order of the first line part, the second line part, the third line part, and the fourth line part. The upper and lower adjacent line parts cross each other at 90 degrees. The position of the intersection produced by the intersection of the first line part and the second line part is the same as the position of the line part produced by the intersection of the second line part and the third line part in a plan view. same. The same applies to the intersection of the second line part and the third line part, and the intersection of the third line part and the fourth line part. Except for this, a ceramic lattice body was obtained in the same manner as in Example 2. In Table 1 showing the specifications, the thickness, width, and distance between the line parts of the third line are shown as T3, W3, and P3, respectively. In addition, the thickness, width, and distance between the line portions of the fourth line portion are shown as T4, W4, and P4, respectively. In Table 1, the first surface of the ceramic lattice body is the outer surface of the first line portion, and the second surface is the outer surface of the fourth line portion. In the obtained lattice body, as shown in Fig. 14, the corners of the rectangular through holes are curved.

[Comparative Example 1]

This comparative example uses a nickel mesh as an example of the grid body. The nickel mesh is formed by flat-weaving a nickel wire with a thickness of 315 μm to form a 32-mesh spray coated with zirconia, and has a thickness of 0.6 mm.

[Comparative Example 2]

In this comparative example, a solution obtained by dissolving gelatin in boiling water (concentration of gelatin is 3% relative to water) is prepared, and this solution is mixed with the yttrium oxide completely stabilized zirconia slurry prepared in advance. The mixing is carried out in such a way that the volume ratio of yttrium oxide in the mixed solution completely stabilized zirconia to water becomes 10:90. The mixed liquid was placed in a refrigerator to make it gelatinized. The gel was frozen by an ethanol freezer. After drying the frozen gel (freeze drying), the dried body obtained is degreased and calcined at 1600°C for 3 hours. The calcined system obtained in this way has a structure with a porosity of 79%, a pore diameter of 95 μm, and the pores are aligned in the thickness direction.

〔Evaluation〕

With regard to the lattice bodies obtained in the examples and comparative examples, the peeling resistance was evaluated by the following method. The results are shown in Table 2 below.

〔Evaluation of resistance to peeling〕

Prepare a sample with a length of 150mm × a width of 150mm × a thickness of 0.8~1.5mm. Place the kiln furniture in the shape of a bracket with legs made of mullite stone (external dimensions of 165mm×165mm, the width of the cross shape at the center is 15mm, and there are 4 hollow structures of 60mm×60mm between the outer frame and the cross). Platen, place the sample on the holder, heat it at high temperature in an atmospheric calcination furnace, and keep it at the desired temperature for more than 1 hour, then take it out from the electric furnace and expose it to room temperature, and visually evaluate whether the sample has undulations or warpage And rupture. The set temperature is gradually increased from 200°C to 1100°C in units of 50°C, and the upper limit of the temperature at which cracking does not occur is set as the "endurance temperature upper limit" as the evaluation of the peeling resistance.

〔Evaluation of shape change caused by repeated firing〕

Prepare each sample with a length of 150 mm × a width of 150 mm, and repeat the calcination mode 65 times in a carbon crucible as follows, that is, the temperature is raised at 400°C/hr in an argon atmosphere, and the temperature is maintained at 1300°C for 5 minutes. hr is cooled, and the difference between the initial shape and the shape of the sample after repeated calcination is evaluated based on the appearance.

From the results shown in Table 2, it is clear that the lattice body obtained in each example has higher peel resistance than each comparative example.

[Industrial availability]

The ceramic grid system of the present invention has high strength and excellent peeling resistance.

1‧‧‧Ceramic lattice body

2‧‧‧Intersection

3‧‧‧Through hole

10‧‧‧The first line part

20‧‧‧Second line part

X‧‧‧direction

Y‧‧‧ direction

Claims (12)

A ceramic lattice body having a plurality of first line portions made of ceramics extending in one direction and a plurality of second line portions made of ceramics extending in a direction intersecting the first line portions, and related to the first line The intersection of the first line part and the second line part. At any of the intersections, the second line part is arranged on the first line part. At the intersection, the first line part has a straight line in its cross section. , And a shape composed of convex curved portions with both ends of the straight portion as the ends, at the intersection, the second line portion has a circular or elliptical cross-section, and is positioned in the longitudinal direction of the intersection. Under the cross-sectional observation, the first line part and the second line part are only the top of the convex curve part in the first line part and the above-mentioned circular or elliptical downward convex top part in the second line part. . Such as the ceramic lattice body of claim 1, wherein the width of the projected image in the plan view at the intersection of the second line portion is approximately the same as the width of the projected image in the plan view at the locations other than the intersection. For example, the ceramic lattice body of claim 1, wherein the first line portion and the second line portion both include ceramics in which two or more types of crystal phases are mixed. Such as the ceramic lattice body of claim 3, wherein the first line portion and the second line portion both include locally stabilized zirconia formed by a mixture of tetragonal crystals and cubic crystals. Such as the ceramic lattice body of claim 1, which further has a plurality of third line parts made of ceramics extending in the same direction as the direction in which the first line parts extend, and the third line parts intersect with the second line parts. 3 The intersection of the line part and the second line part. At any of the intersections, the third line part is arranged on the second line part, and the arrangement pitch of each third line part and the first line part is staggered by half Space and configuration. A ceramic lattice body having a plurality of first line portions made of ceramics extending in one direction and a plurality of second line portions made of ceramics extending in a direction intersecting the first line portions, and related to the first line The intersection of the first line part and the second line part. At any of the intersections, the second line part is arranged on the first line part. A shape composed of a straight portion and a convex curved portion whose ends are the ends of the straight portion. The second line portion has a circular or elliptical shape in cross section at a portion other than the above-mentioned intersection, and the second The line part means that the projected image in the plan view is curved and bulged toward the outside in the width direction at the intersection, whereby the width of the projected image at the intersection becomes larger than the width of the projected image at the part other than the intersection. . For example, the ceramic grid body of claim 6, wherein the first line part is the projected image in a plan view. The projected image at the intersection becomes a shape that is curved and bulged toward the outside in the width direction, whereby the width of the projected image at the intersection becomes It is larger than the width of the projected image at parts other than the above-mentioned intersection. Such as the ceramic lattice body of claim 6, which contains ceramics containing alumina, mullite, cordierite, zirconia, silicon nitride or silicon carbide. Such as the ceramic lattice body of claim 8, which is coated with zirconia on the surface. For example, the ceramic lattice body of claim 1 or 6, wherein when the linear part of the first line part is placed on a plane as a placing surface, the second line part is formed between two adjacent intersections. The shape separated from the plane. Such as the ceramic lattice body of claim 1 or 6, which is used as a bracket for calcination of ceramic products. A method for manufacturing a ceramic grid body, which is to apply a first paste containing a ceramic material, a first raw material powder, a medium, and a bonding agent, on a flat substrate in a linear fashion, parallel to each other and linearly The first coating body of a plurality of lines is formed, the medium is removed from the first coating body of the plurality of lines, the first coating body of the line is dried, and the second raw material powder containing the ceramic material, the medium and the binder are removed. 2 The paste is applied linearly so as to intersect the plurality of lines of the first coating body after drying, and a plurality of lines are formed parallel to each other and linearly. The second coating body is from the plurality of lines above The line second coating body removes the medium, the line second coating body is dried to form a grid-shaped precursor, and the grid-shaped precursor is calcined.

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