WO2020174893A1

WO2020174893A1 - Ceramic structure

Info

Publication number: WO2020174893A1
Application number: PCT/JP2020/000611
Authority: WO
Inventors: 峻有馬; 光司本田
Original assignee: 三井金属鉱業株式会社
Priority date: 2019-02-28
Filing date: 2020-01-10
Publication date: 2020-09-03
Also published as: TW202033480A; TWI760679B; CN113454414B; JP6952170B2; CN113454414A; KR20210116564A; JP2020189785A

Abstract

A ceramic structure (1) comprises: a plurality of first ceramic linear parts (10) that extend in one direction; a plurality of second ceramic linear parts (20) that extend in a direction intersecting with the first linear parts (10); and a third ceramic linear part (30) that passes on the diagonal of a quadrangle defined by the intersection of the first linear parts (10) and the second linear parts (20). A plurality of triangular through-holes, which are each defined by the first linear parts (10), the second linear parts (20), and the third linear part (30), are formed.

Description

\¥02020/174893 1 卩 (: 17 2020/000611

Specification

Title of invention: Ceramic structure

Technical field

The present invention relates to a structure formed by combining ceramic linear portions.

Background technology

[0002] The present applicant has previously found that a plurality of first linear filament portions made of ceramics extending in one direction and a plurality of ceramic linear filaments extending in a direction intersecting with the first linear filament portions. A ceramic grid having a second linear portion was proposed (see Patent Documents 1 and 2). At the intersection of the first and second filaments in this ceramic grid, the second filament is arranged on the first filament at any of the intersections. It has a rectangular through hole in plan view.

Prior art documents

Patent literature

[0003] Patent Document 1: Japanese Patent Laid-Open No. 2018_1884340

Patent Document 2: JP 20 18-1 9 3 2 7 4

Summary of the invention

[0004] The ceramic lattice bodies described in Patent Documents 1 and 2 have high strength and excellent spalling resistance due to the lattice structure. In particular, the strength along the direction parallel to the lattice is extremely high. However, further improvement in strength may be required in the diagonal direction of the lattice.

[0005] Therefore, an object of the present invention is to improve a structure composed of a plurality of ceramic linear portions, and more specifically, to provide the structure with higher strength and high heat shock resistance. To do.

The present invention is directed to a plurality of ceramic first linear portions extending in one direction and a plurality of ceramic first linear portions extending in a direction intersecting the first linear portions. \¥02020/174893 2 (:171?2020/000611

The second linear portion, and the third linear portion made of ceramics that passes along the diagonal of the quadrilateral defined by the intersection of the first linear portion and the second linear portion. ,

By providing a plate-shaped ceramic structure having a plurality of triangular through holes defined by the first linear portion, the second linear portion and the third linear portion, It is a solution to the problem.

Brief description of the drawings

[0007] [FIG. 1] FIG. 1 is a plan view showing an embodiment of a ceramic structure of the present invention.

[Fig. 2] Fig. 2 is a perspective view of the ceramic structure shown in Fig. 1, viewed from the top side.

[Fig. 3] Fig. 3 is a perspective view of the ceramic structure shown in Fig. 1 as seen from the lower surface side.

[Fig. 4] Fig. 4 is a cross-sectional view taken along the line 8_8 in Fig. 1.

[Fig. 5] Fig. 5 is a sectional view taken along the line _ _ in Fig. 1.

[Fig. 6] Fig. 6 is a cross-sectional view of the third filament portion in the ceramic structure shown in Fig. 1.

[Fig. 7] Figs. 7(a) and 7() are cross-sectional views of the first linear portion and the second linear portion in the ceramic structure shown in Fig. 1, respectively.

[FIG. 8] FIG. 8 (8) is a plan view showing another embodiment of the ceramic structure of the present invention, and FIG. 8 (13) is a sectional view taken along line 8 — 8 in FIG. 8 (a ). Is.

[FIG. 9] FIG. 9 ( ₃ ) is a plan view showing still another embodiment of the ceramic structure of the present invention, and FIG. 9 (13) is a sectional view taken along line 8 — 8 in FIG. 9 (a ). Is a figure

MODE FOR CARRYING OUT THE INVENTION

[0008] Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. 1 to 7 show one embodiment of the ceramic structure of the present invention. The ceramic structure (hereinafter also simply referred to as “structure”) 1 shown in these figures has a flat plate shape, and has a first surface 13 and a second surface facing it. \\02020/174893 3 (¥171?2020/000611

1 13 and.

[0009] The structure 1 of the present embodiment has a plurality of ceramic first linear portions 10 extending in the one direction X. The respective first linear portions 10 are substantially straight and extend parallel to each other. The intervals between the adjacent first linear portions 10 are almost equal.

The structure 1 has a plurality of second filament portions 20 made of ceramics and extending in a vertical direction that is a direction different from the X direction. Each second linear portion 20 is straight and extends parallel to each other. The intervals between the adjacent second linear portions 20 are almost equal. Since the X direction is different from the vertical direction, the first linear portion 10 and the second linear portion 20 intersect. The crossing angle between the two linear sections 10 and 20 can be set according to the specific application of the ceramic structure 1. For example, the angle of intersection of the second linear portion 20 with the first linear portion 10 can be 90 degrees. Alternatively, as shown in Fig. 1, when viewed along the counterclockwise direction with the first linear portion 10 as the reference, the first linear portion 10 and the second linear portion 20 are It is also possible to change the intersection angle 0 formed by the angle within the range of 60 degrees ± 40 degrees or 90 degrees ± 40 degrees. When the plurality of first linear portions 10 and the plurality of second linear portions 20 intersect each other, a grid having quadrangular apertures is formed in the plan view of the structure 1. To be done. Although Fig. 1 shows a state in which a lattice having diamond-shaped openings is formed by the intersection of the first linear portion 10 and the second linear portion 20. The shape can be a quadrangle other than the rhombus, for example, a rectangle or a square not shown.

The [001 1] structure 1 further has a plurality of third linear portions 30 made of ceramics.

Each third linear portion 30 is straight and extends parallel to each other. The third linear portion 30 extends along a direction different from both the extending direction X of the first linear portion 10 and the extending direction of the second linear portion 20. Each of the third linear portions 30 is arranged so as to pass on the diagonal line of the quadrilateral defined by the intersection of the first linear portions and the second linear portions. As a result, in the structure 1 of the present embodiment, the first linear portion 10 and the second linear portion 20 and \¥02020/174893 4 (: 17 2020/000611

A plurality of triangular through holes 3 defined by the third linear portions 30 are formed. FIG. 1 shows a state in which a substantially equilateral triangular through hole 3 is formed.

[0012] As described above, in the structure 1, the third linear portion 30 is a quadrilateral diagonal line defined by the intersection of the first linear portion and the second linear portion. Since it is arranged so as to pass above, it is preferable that the first to third linear portions 10 0, 20 0 and 30 0 always intersect at one intersection 2 in the plan view of the structure 1. .. In other words, it is preferable that, among the three linear portions 1 0, 2 0, 3 0, the intersection portion where only two linear portions intersect does not substantially exist in the structure 1. ..

[0013] As in the present embodiment, the structure 1 in which the triangular through holes are formed by using the three types of linear portions in combination has a high strength in the three directions of the X direction, the ridge direction and the directional direction. Becomes Therefore, the anisotropy of strength reduction is less than that of the lattice bodies described in Patent Documents 1 and 2 which have high strength along the two directions. In particular, when the through-hole 3 is a substantially equilateral triangle as shown in FIG. 1, the sides of the equilateral triangle are substantially equal in length, and the first to third filament portions 10 and 20, Since it is formed by any one of the 30, it is almost equivalent in strength. Therefore, the anisotropy of the strength decrease is further reduced, and the strength is almost equal in all directions.

[0014] Furthermore, according to the structure of the present embodiment, it is possible to easily form the small through holes as compared with the lattice bodies described in Patent Documents 1 and 2. Therefore, when the structure of the present embodiment is used as a setter also called, for example, a shelf plate or a floor plate, which is used when baking an object to be fired, an object to be baked having a smaller size is mounted on the structure. It is possible to place it. This means that by firing it, chip monolithic ceramic capacitors

Is particularly advantageous when producing

Moreover, the structure of the present embodiment can have a smaller mass than that of the lattice bodies described in Patent Documents 1 and 2, when the structure has the same strength. As a result, when the structure of the present embodiment is used as a setter, the structure is set during firing. \¥02020/174893 5 ((171?2020/000611

There is also an advantage that temperature unevenness in the body is reduced and thermal shock resistance is improved.

As shown in FIGS. 4 and 5, in the structure 1, the third linear portion 30 is located on the first surface 13 side, and the first line is on the second surface 1 side. Article 10 is located. Then, the second linear portion 20 is arranged on the third linear portion 30 and the first linear portion 10 is arranged on the second linear portion 20. Further, as shown in FIGS. 1 to 5, the third linear portion 30 and the second linear portion 20 are located on the third linear portion 30 at any intersection 2. Two linear parts 20 are arranged. That is, at intersection 2, the structure

Of the set, the second linear section 20 located relatively on the second surface 1 side is located on the third linear section 30 located relatively on the first surface 13 side. Has been done. In addition to this, the second linear portion 20 and the first linear portion 10 are arranged so that, at any intersection 2, the first linear portion 1 is located on the second linear portion 20. 0 is allocated. That is, at intersection 2, the structure

The first linear portion 10 located relatively on the side of the second surface 1 is arranged on the second linear portion 20 located relatively on the side of the first surface 13 of the set. Has been done.

[0017] The thickness at the intersecting portion 2 is the thickness of the first linear portion 10 at the portion other than the intersecting portion, the thickness of the second linear portion 20 and the thickness of the third linear portion 30. It may be larger than the sum. Alternatively, the thickness at the intersecting portion 2 is the thickness of the first filament portion 10, the thickness of the second filament portion 20 and the thickness of the third filament portion 30 at portions other than the intersection portion. It may be the same as the sum or may be smaller than the sum. Therefore, the maximum thickness part of the structure 1 exists at the intersection 2 or exists at a portion other than the intersection.

As shown in FIG. 6, the third linear portion 30 has a constant width \^/3 in plan view at positions other than the intersection 2. The third linear portion 30 has a cross-sectional shape along the thickness direction in the direction orthogonal to the longitudinal direction thereof, as shown in FIG. 6, which is located on the first surface 13 side of the ceramic structure 1. It is defined by one surface 303 and a second surface 30 s located on the second surface 1 sill side of the ceramic structure 1. In detail \¥02020/174893 6 卩 (: 171?2020/000611

The cross section of the third linear portion 30 along the thickness direction in the direction orthogonal to the longitudinal direction is such that the straight portion 30 and both end portions of the straight portion 30 It has a shape that is composed of a convex curved part 30 and a part. As a result, the first surface 303 of the third linear portion 30 has a flat cross section in the thickness direction of the linear linear portion 30. The flat surface is substantially parallel to the in-plane direction of the ceramic structure 1. On the other hand, the second surface 30 of the third linear portion 30 has a cross section in the thickness direction of the linear portion 30 that is convex from the first surface 13 to the second surface 1 of the ceramic structure 1. It has a curved shape.

[0019] Similar to the third linear portion 30, as shown in Figs. 7(a) and (匕), the first linear portion 10 and the second linear portion 20 are also other than the intersection 2. At the position, it has a constant width \^/1, \^/2 in plan view. The widths \^/1 and \^/2 may be the same or different from each other. The widths \^/1 and \^/2 may be the same as or different from the width \^/3 of the third linear portion 30. In manufacturing Structure 1, it is convenient to make \^1, \^/2, and \^/3 the same. The first linear portion 10 and the second linear portion 20 have a cross-sectional shape along the thickness direction in a direction orthogonal to the longitudinal direction thereof as shown in FIGS. 7 ( ₃ ) and (). body

It is defined by 203 and the second surface of the ceramic structure 1, which is located on the side of the second surface and the second surface of the ceramic structure. First surface 1 〇 ₃ of the first linear portions 1 〇 and second linear portions 20, 2_Rei _3, a cross section in the thickness Direction, first from the second surface 1 spoon of the ceramic structure 1 1 It has a convex curved shape toward the surface 13. On the other hand, the second surface 1013, 2013 of the first linear portion 10 and the second linear portion 20 has a cross section in the thickness direction from the first surface 13 to the second surface 1 of the ceramic structure 1. It has a curved surface that is convex toward the swell. This curved surface shape may be the same as or different from the curved surface shape of the third linear portion 30. In the present embodiment, the first surface 1 〇 ₃ of the first linear portions 1 〇 and second line ridges 20, 2_Rei ₃ and the second surface 1 013, 20 spoon has become symmetrical As a result, the first linear portion 10 and the second linear portion 20 have a circular or elliptical cross-sectional shape along the thickness direction in the direction orthogonal to the longitudinal direction. \¥02020/174893 7 卩 (: 171-12020/000611

ing.

[0020] As shown in FIG. 5, the straight line portion 30 in the third linear portion 30 is the

When one surface 103 is placed on a flat surface as a mounting surface, each first surface 303 is located on the flat surface. Since the 1st surface 3 0 3 forms the 1st surface 13 in the ceramic structure 1, the fact that all the 1st surfaces 3 0 3 lie on the plane means that the 1st surface in the structure 1 It means that 1 3 is a flat surface. Therefore, when the structure 1 is mounted such that the first surface 13 thereof contacts the flat mounting surface, the entire area of the first surface 13 contacts the mounting surface.

[0021] As shown in FIG. 5, the straight line portion 30 in the third linear portion 30

When the first surface 3 0 3 is placed on a flat surface as a mounting surface, the first linear portion 10 and the second linear portion 20 are separated from the flat surface between two adjacent intersecting portions 2. It has a shape that Therefore, a space 3 is formed between the first linear portion 10 and the second linear portion 20 and the plane between two adjacent intersecting portions 2.

[0022] On the other hand, the second surface 1 of the structure 1 is composed of the second surface 1 0 13 of the first linear portion 10 having a convex curved surface shape as shown in Fig. 7(a). Therefore, the surface is uneven, not flat.

[0023] At the intersection 2 of the structure 1, the three kinds of linear portions 10 0 20 0 30 are integrated. “Integrated” means that, in observing the cross section of the intersection 2, the three types of linear portions 10, 20, and 30 are continuous structures as ceramics. The through holes 3 formed in the structure 1 by the intersections of the three types of linear portions 10, 20, and 30 have the same size and the same shape. The through holes 3 are regularly arranged.

[0024] The third linear portion 30 has the highest position of the second surface 30 in the third linear portion 30 at a position other than the intersection 2; They are the same along the direction in which the linear portions 30 extend.

Regarding the second linear strip portion 20, the highest position of the second surface 20 sill in the second linear strip portion 20 is the highest position of the second linear strip portion 20 in the portion other than the intersection 2. Extend \¥02020/174893 8 卩 (: 171?2020/000611

They are in the same position along the direction. The lowest position of the first surface 20 _{3 in} the second linear portion 20 is the same position as the second linear portion 20 along the extending direction of the second linear portion 20 except the intersection 2. ..

Further, regarding the first linear portion 10, the highest position of the second surface 10 13 in the first linear portion 10 is at either the position of the intersection 2 or the position other than the intersection 2. However, they are located at the same position along the extending direction of the first linear portion 10. The lowest position of the first surface 10 3 in the first linear portion 10 is the same position as the first linear portion 10 along the extending direction of the first linear portion 10 except the intersection 2. ..

As shown in FIGS. 4 and 5, when the cross section 2 of the structure 1 is viewed in a longitudinal section, the third linear portion 30 and the second linear portion 20 are The apex of the convex curved portion 30 of the linear portion 30 and the downward convex curve of the circular or elliptical shape of the second linear portion 20, that is, the first surface 2 0 3 Only the top is touching. In other words, the third linear portion 30 and the second linear portion 20 are in a state of point contact or surface contact close to point contact. The second linear portion 20 and the first linear portion 10 are the tops of the upwardly convex curves in the circular or elliptical shape of the second linear portion 20, that is, the second surface 20 The top and the top of the downward convex curve in the circular or elliptical shape of the first linear portion 10, that is, the first surface 1

Only the top 6 of is in contact. As a result of the study by the present inventors, it was found that the structure 1 has improved spalling resistance due to the three kinds of linear portions 10, 20, and 30 being in such a contact state. The reason for this is that there are three types of filaments 1 0, 2 0,

Since 30 is connected by making point contact or surface contact close to it, it becomes difficult for these linear portions 10, 20, 0, 30 to bond excessively firmly, and as a result, rapid contact is possible. It is considered that this is because it is possible to alleviate the volume change that occurs at the time of heating and/or cooling. From this point of view, the thickness of the intersection 2 is 0, the thickness of the first linear portion 10 at positions other than the intersection 2, and the thickness of the second linear portion 2 at positions other than the intersection 2. It is the sum of the thickness 0 of 0 and the thickness 3 of the third linear portion 30 at positions other than the intersection 2 (D 1 + D 2 + D 3), preferably 0 \¥02020/174893 9 ((171?2020/000611

.5 or more! 0.0 or less, more preferably 〇 or more! 0.0 or less, more preferably 0.9 or more! The point contact condition is such that it is less than 0.0.

[0026] In order to bring the first linear portion 10 and the second linear portion 20 and the third linear portion 30 into point contact or surface contact close to point contact, For example, the structure 1 may be manufactured by the method described below.

When the ceramic structure 1 having the above structure is used as, for example, a setter for firing a body to be fired, by placing the body to be fired on the first surface 13 of the structure 1, Since the first surface 13 is a flat surface, it is suitable for placing an object to be fired, which requires flatness. Examples of the object to be fired that requires flatness include small chip-shaped electronic parts such as multilayer ceramic capacitors. Since these small electronic components are required not to be caught by the setter during the firing process, it is advantageous that the first surface 13 of the structure 1 is flat. Further, since the object to be fired makes contact only with the first linear portion 10 which is a member forming the first surface 13, the contact area between the structure 1 and the object to be fired is significantly reduced, which It becomes easy to rapidly heat and cool the object to be fired. Further, since the structure 1 is formed by the intersection of the three types of linear portions 10, 20, 20 and 30 and the plurality of through holes 3 are formed, the heat capacity is small, and from this point as well It is easy to heat and cool the body rapidly. Further, since the structure 1 has good air permeability due to the presence of the plurality of through holes 3, this also facilitates rapid cooling of the body to be fired. The good air permeability becomes more remarkable due to the fact that the second linear portion 20 floats between the adjacent intersections 2. Moreover, in the structure 1, since the three kinds of linear portions 10, 20, and 30 are integrated at the intersection portion 2, the structure 1 has sufficient strength.

[0028] On the other hand, in the second surface of the structure 1

It is advantageous to place an order object to be fired. The second surface (1) is an uneven surface due to the curved surface of the first linear portion (10).The electronic component of this leader size has unevenness on the surface on which it is placed. However, it is advantageous from the viewpoint of enhancing degreasing property.

[0029] As described above, in the structure 1 of the present embodiment, one surface thereof is flat and the other surface is flat. \¥02020/174893 10 ((171?2020/000611

Since the surface is uneven, it is advantageous in that the mounting surface can be used properly according to the type of the object to be fired.

[0030] From the viewpoint of making the various advantageous effects mentioned above more remarkable, the value of Ding 3 is

, 500! or more and 500!! or less, and more preferably 200! or more and 20!111 or less. On the other hand, the values of Ding 1 and Ding 2 are

It is preferably not more than 200,000 and more preferably not more than 200!111. There is no particular limit to the size relationship between Ding 1, Ding 2, and Ding 3.

[0031] From the same viewpoint, the thickness D at the intersection 2 is preferably at least 0.5 or more with respect to (Ding 1 + Ding 2 + Ding 3)! .0 or less, provided that

More preferably, it is not less than 500! And not more than 20!.

[0032] In addition, when the cross-sectional shape of the first linear portion 10 and the second linear portion 20 in the thickness direction (see Fig. 7 (3) and (bath)) is elliptical, an elliptical shape It is preferable that the short axis of the above-mentioned is aligned with the thickness direction of the structure 1 and the long axis of the ellipse is aligned with the plane direction of the structure 1 from the viewpoint that the object to be fired can be placed successfully. In this case, the ratio of major axis/minor axis is preferably independently 1 or more and 5 or less, and more preferably 1 or more and 3 or less. In addition, the elliptical or circular cross-sectional shape of the first linear portion 10 and the second linear portion 20 in the thickness direction also contributes to improving the strength of the structure 1.

[0033] The triangular through holes 3 formed in the ceramic structure 1 have an area of 10

Are preferable from the viewpoint of reducing the heat capacity of the structure 1, improving the air permeability, and maintaining the strength of the structure 1. The ratio of the total area of the through holes 3 to the apparent area of the ceramic structure 1 in plan view is preferably 1% or more and 80% or less, and 3% or more and 70% or less. More preferably, it is more preferably 10% or more and 70% or less. This ratio is obtained by cutting the ceramic structure 1 in a plan view and cutting it into a rectangle of any size. \¥0 2020/174893 1 1 卩 (: 171? 2020 /000611

It is calculated by calculating the sum of the areas of the through holes 3 included therein, dividing the sum by the area of the rectangle, and multiplying by 100. The area of each through hole 3 can be measured by image analysis of a microscope observation image of the structure 1.

[0034] In relation to the area of the through hole 3, the width \^/ 3 of the third linear portion 30 is 50 0 or more 1

It is preferably 0! or less, more preferably 7500! or more and 10! or less. On the other hand, the widths \^/1, \^ 2 of the first linear portion 10 and the second linear portion 20 are independently 50 or more 1

It is preferable that

The following is more preferable. There is no particular limitation on the magnitude relation between the values of \^/ 1, \^/ 2 and \^/ 3.

[0035] In relation to the widths \^/ 1, \^/ 2, \^/ 3 of the first, second and third linear portions 1 0, 2 0, 3 0, adjacent third lines The distance 0 3 between the strips 30 is preferably 100 or more and 1 0 111 〇! or less,

It is further preferable that On the other hand, the distance 0 between the adjacent first linear portions 10 and the distance 0 2 between the second linear portions 20 are

Is more preferable, and it is more preferable that it is 1 500 1 or more and 5 01 01 or less. 0 1, 0 2 and 0 3 may be the same as or different from each other. From the viewpoint of manufacturing the structure 1, it is convenient that the mouths 1, 0 2 and 0 3 are the same.

Various materials can be used as the ceramic material forming the ceramic structure 1. Examples thereof include alumina, silicon carbide, silicon nitride, zirconia, mullite, zircon, cordierite, aluminum titanate, magnesium titanate, magnesia, titanium diboride, and boron nitride. These ceramic materials can be used alone or in combination of two or more. In particular, it is preferably made of ceramics containing alumina, mullite, cordierite, zirconia or silicon carbide. When ceramics containing zirconia are used, zirconia completely stabilized by the addition of yttria can be used in order to make Structure 1 more suitable for use at high temperature firing. Sudden heating and cooling of the ceramic structure 1 \¥02020/174893 12 ((171?2020/000611

In the case of use, it is particularly preferable to use silicon carbide as the ceramic material. Since silicon carbide may react with the material to be fired, when silicon carbide is used as the ceramic material, it is preferable to coat the surface with a ceramic material having low reactivity such as zirconia. As the raw material powder of the ceramic material constituting the structure 1, it is preferable to use a powder having a particle size of 0.1 or more and 200 or less in consideration of the viscosity and the easiness of baking when formed into a paste. The ceramic materials forming the three kinds of linear portions 10, 20, and 30 may be the same or different. From the viewpoint of increasing the unity of the three types of linear portions 1 0, 2 0, 3 0 at the intersection 2, the ceramic materials forming the linear portions 1 0, 2 0, 3 0 are the same. I like that.

Next, a preferred method for manufacturing the ceramic structure 1 of the present embodiment will be described. In the present manufacturing method, first, a raw material powder of a ceramic material is prepared, and the raw material powder is mixed with a medium such as water and a binder to prepare a paste for producing a linear portion.

[0038] As the binder, the same binder as that conventionally used for this type of paste can be used. Examples thereof include polyvinyl alcohol, polyethylene glycol, polyethylene oxide, dextrin, soda and ammonium ligninsulfonate, carboxymethylcellulose, ethylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, alginic acid. Sodium and ammonium, epoxy resins, phenolic resins, gum arabic, polyvinyl butyral, acrylic polymers such as polyacrylic acid and polyacrylic amide, thickening polysaccharides such as xanthan gum and guar gum, gelatin, agar and bectin. Gelling agents, vinyl acetate resin emulsions, wax emulsions, and inorganic binders such as alumina sol and silica sol. Two or more of these may be mixed and used. \¥02020/174893 13 ((171?2020/000611

[0039] The viscosity of the paste is preferably high at the temperature at the time of application from the viewpoint that the structure 1 having the structure of the present embodiment can be produced successfully. In detail, the viscosity of the paste should be 1.

a 3 or more 5.0

It is preferably IV! 33 or less, more preferably 1.7 IV! 33 or more and 3.0 IV! 3-or less. The viscosity of the paste was measured 4 minutes after the start of measurement at a rotation speed of 0.3 ", using a cone-plate type rotary viscometer or rheometer.

[0040] The ratio of the ceramic raw material powder in the paste is 20% by mass or more 8

It is preferably 5% by mass or less, more preferably 35% by mass or more and 75% by mass or less. The proportion 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 proportion 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.

[0041] The paste may contain, as a viscosity modifier, a thickener, a coagulant, a thixotropic agent, and the like. Examples of the thickener include polyethylene glycol fatty acid ester, alkylallyl sulfonic acid, alkyl ammonium salt, ethyl vinyl ether/maleic anhydride copolymer, fumed silica, proteins such as albumin and the like. In many cases, the binder has a thickening effect and thus may be classified as a thickener, but when more strict viscosity adjustment is required, a thickener not separately classified as a binder is used. Agents can be used. Examples of the coagulant include polyacrylic amide, polyacrylic acid ester, aluminum sulfate, polyaluminum chloride and the like. Examples of thixotropic agents include fatty acid amides, oxidized polyolefins, and polyether ester type surfactants. As the solvent for preparing the paste, alcohol, acetone, ethyl acetate and the like are used in addition to water, and two or more kinds of these may be mixed. Further, in order to stabilize the discharge amount, a plasticizer, a lubricant, a dispersant, a sedimentation inhibitor, a !! Plasticizer \¥02020/174893 14 卩 (: 171?2020/000611

Glycerin such as trimethylene glycol and tetramethylene glycol, glycerin, butanediol, phthalic acid, adipic acid, phosphoric acid and the like. Examples of the lubricant include liquid paraffin, micro wax, hydrocarbon type such as synthetic paraffin, higher fatty acid, fatty acid amide and the like. Examples of the dispersant include sodium or ammonium polycarboxylic acid, acrylic acid-based, polyethylenimine, and phosphoric acid-based. Sedimentation inhibitors include polyamine amine salts, bentonite, aluminum stearate and the like. ..! Adjusting agents include sodium hydroxide, aqueous ammonia, oxalic acid, acetic acid, hydrochloric acid.

[0042] Using the obtained paste, a plurality of linear third line coated bodies are formed in parallel and linearly on a flat substrate. The third line-shaped coated body corresponds to the third line-shaped portion 30 in the target structure 1. The third paste, which is the paste used for forming the third filament coated body, contains the above-mentioned third raw material powder of the ceramic material, a medium, and a binder. Various coating devices such as a small extruder and a printing machine can be used to form the third filament coating material using the third paste.

[0043] After the medium is removed from the line-shaped third coated body, a second paste is used to form a plurality of line-shaped second coated bodies so as to intersect the line-shaped third coated body. Form parallel to each other and linearly. The second linear strip coated body corresponds to the second linear strip portion 20 in the target structure 1. The second paste may have the same composition as the third paste, and contains the second raw material powder of the ceramic material, the medium and the binder. The same coating device as that used for the third filament coating can be used to form the second filament coating. After the second filament coated body is formed, the medium is removed from the second filament coated body and dried to further increase the viscosity of the second filament coated body. This operation can be performed in the same manner as the operation for the filamentary third coated body.

[0044] After the medium is removed from the filament-shaped second coated body, a plurality of filaments are then applied using the first paste so as to intersect the filament-second coated body and the filament-shaped third coated body. Stroke first coating \¥02020/174893 15 卩(: 171?2020/000611

(D) Form the bodies parallel to each other and in a straight line. The first linear strip coated body corresponds to the first linear strip portion 10 of the target structure 1. As the first paste, the same composition as the second paste and/or the third paste can be used, and it contains the first raw material powder of the ceramic material, the medium and the binder. The same coating device as that used for the second line coated body and the third line coated body can be used to form the first line coated body. After the first filament coating material is formed, the medium is then removed from the first filament coating material and dried to further increase the viscosity of the first filament coating object. This operation can be performed in the same manner as the operation for the second line coated body and/or the third line coated body. In this manner, the formation of the filament 3rd coated body and the removal of the medium, the formation of the filament 2nd coated body and the removal of the medium, and the formation of the filament 1st coated body and the removal of the medium are sequentially performed. By doing so, the structure in which the second linear section 20 is located on the third linear section 30 and the first linear section 10 is located on the second linear section 20. 1 is obtained successfully.

The pre-fired structure thus obtained is separated from the substrate, placed in a firing furnace, and fired. By this firing, the target ceramic structure 1 is obtained. Firing can generally be performed in the atmosphere. The firing temperature may be selected as appropriate depending on the type of raw material powder of the ceramic material. The same applies to the firing time.

By the above method, the intended ceramic structure 1 is obtained. The ceramic structure 1 is preferably used as a setter for degreasing or baking ceramic products such as shelves and floor boards, and can also be used as a kiln tool other than the setter, for example, a jar or a beam. Further, it can be used for applications other than kiln tools, for example, various jigs such as filters and catalyst carriers, and various structural materials. In this case, it is general to place the object to be fired on the second surface 1 which is the uneven surface of the structure 1, but depending on the type of object to be fired, the first surface 1 3 You may mount the to-be-baked body on it. For example, chip monolithic ceramic capacitors

When performing the firing process in the process of manufacturing electronic components such as ceramics and monolithic ceramic inductors, place the firing target on the first surface 1 3 which is a flat surface. \¥02020/174893 16 卩 (: 171?2020/000611

It is preferable to mount it on. The setter on which the object to be fired is placed may fire the object to be fired, or another structure that may be another ceramic structure 1 or a lid on the object to prevent the object to be fired from scattering. You may place the body on it and bake it. In addition, in order to improve the efficiency of the firing process, the ceramic structures 1 on which the objects to be fired are placed may be stacked in a plurality of stages and may be fired. A spacer may be placed and baked. In addition, the ceramic structure 1 has the ceramic structure 1 mounted on a mounting portion of another ceramic tray, and the body to be fired is mounted on the ceramic structure 1 to form a unit with this. It is also applicable to a mode in which a plurality of units are fired in a stacked state.

Next, another embodiment of the ceramic structure of the present invention will be described with reference to FIGS. 8 (3) and (bath) and FIGS. 9 (a) and (bath). Regarding these embodiments, only the points different from the above-described embodiments will be described, and regarding the points that are not particularly described, the description of the above-described embodiments is appropriately applied. Further, in FIGS. 8(a) and (13) and FIGS. 9(a) and (10), the same members as those in FIGS. 1 to 7 are denoted by the same reference numerals.

[0048] The ceramic structure 1 of the embodiment shown in Figs. 8(a) and 8(c) shows how the first, second and third linear portions 10, 20 and 30 are laminated. It is different from the embodiment shown in FIG. Specifically, the second linear portion 20 is arranged on the first linear portion 10, and the third linear portion 30 is arranged on the second linear portion 20. The third linear portion 30 is arranged so as to pass on the diagonal line of the quadrangle defined by the intersection of the first linear portion and the second linear portion.

[0049] The first linear portion 10, the second linear portion 20 and the third linear portion 30 intersect at one intersection 2. Then, at any intersection 2, the second linear portion 20 is arranged on the first linear portion 10. Further, at any intersection 2, the third linear section 30 is arranged on the second linear section 20.

[0050] As shown in Fig. 8 (b ), the first linear portion 10 has a cross-sectional shape along the thickness direction in a direction orthogonal to the longitudinal direction, which is the first surface 1 3 of the ceramic structure 1. \¥02020/174893 17 卩(: 171?2020/000611

Side 1 located on side 1

And the second surface 10 sq. located on the second surface 1 sq. side of the ceramic structure 1. Specifically, the first linear portion 10 has a straight line portion 10 and a straight line portion 10 at a portion other than the crossing portion 2 in a cross section along the thickness direction in a direction orthogonal to the longitudinal direction. It has a shape composed of a convex curved portion 10 having both ends of the portion 10 as ends. As a result, the first linear part 10

The cross section of the linear portion 10 in the thickness direction is a flat surface. The flat surface is substantially parallel to the in-plane direction of the ceramic structure 1. On the other hand, the second surface 10 of the first linear portion 10 has a cross section in the thickness direction of the linear portion 10 from the first surface 13 to the second surface 1 of the ceramic structure 1. It has a convex curved surface shape. On the other hand, the cross sections of the second linear section 20 and the third linear section 30 have a circular or elliptical shape in a portion other than the intersection 2.

The ceramic structure 1 of the embodiment shown in FIGS. 9(a) and 9() is also shown in FIG.

Similar to the ceramic structure 1 of the embodiment shown in (a) and (), the method of stacking the first, second, and third linear portions 10 20, 20 and 30 is the same as the embodiment shown in FIG. Specifically, the third linear portion 30 is arranged on the second linear portion 20 and the first linear portion 1 0 is arranged on the third linear portion 30. The third linear portion 30 is arranged so as to pass on the diagonal line of the quadrangle defined by the intersection of the first linear portion and the second linear portion. ing.

[0052] The first linear portion 10, the second linear portion 20 and the third linear portion 30 intersect at one intersection 62. Then, at any intersection 2, the third linear portion 30 is arranged on the second linear portion 20. Furthermore, at any intersection 2, the first linear portion 10 is arranged on the third linear portion 30.

As shown in FIG. 9 (b ), the second filament portion 20 has a cross-sectional shape along the thickness direction in the direction orthogonal to the longitudinal direction, which is the first surface 1 3 of the ceramic structure 1. It is defined by the first surface 203 located on the side and the second surface 20 surface located on the side of the second surface 1 of the ceramic structure 1. Specifically, the second linear portion 20 has a cross section along the thickness direction in a direction orthogonal to its longitudinal direction at a portion other than the intersection portion 2. \¥02020/174893 18 卩 (: 171?2020/000611

In addition, it has a shape composed of a straight line portion 20 and a convex curved line portion 20 having end portions at both ends of the straight line portion 20. As a result, the first surface 208 of the second linear portion 20 has a flat cross section in the thickness direction of the linear portion 20. The flat surface is substantially parallel to the in-plane direction of the ceramic structure 1. On the other hand, the second surface 20 of the second linear portion 20 has a cross section in the thickness direction of the linear portion 20 from the first surface 13 to the second surface 1 of the ceramic structure 1. It has a convex curved surface shape. Regarding the second linear portion 30 and the first linear portion 10, their cross sections have a circular or elliptical shape in a portion other than the intersection 2.

[0054] The same effects as those of the embodiment shown in Figs. 1 to 7 are also obtained by the embodiments shown in Figs. 8(a) and (swell) and Figs. 9(a) and 9(s).

Next, items common to the above-described embodiments will be described. The shape of the ceramic structure of each of the embodiments described above is not particularly limited in plan view, and may be, for example, a circular shape, an elliptical shape, a rectangular shape, or the like. Alternatively, it may have a contour that is a combination of straight lines and curved lines. If the ceramic structure has a straight side at least in part of its contour, one of the first, second, and third linear sections 10, 20, 20 It is preferable that the ridges are arranged in parallel with the straight side portions from the viewpoint of more strongly maintaining impact resistance near the straight side portions of the ceramic structure. Further, it is preferable that the straight side portion intersects with the intersecting portion at any position of the straight side portion from the viewpoint of preventing chipping due to chipping at the end portion of the ceramic structure.

[0056] Particularly, in the case of the ceramic structure 1 of the embodiment shown in Fig. 1, the first linear portion 10 or the third linear portion 30 is arranged in parallel with the straight side portion. Is preferred. In this case, the second linear portion 20 and the straight side portion are not less than 10 degrees and not more than 80 degrees or not less than 100 degrees and not more than 170 degrees, and particularly not less than 20 degrees and not more than 70 degrees or 11 Propagation of defects such as cracks generated in the ceramic structure 1 is that they intersect at an angle of 0 degrees or more and 160 degrees or less, particularly 30 degrees or more and 60 degrees or less, or 105 degrees or more and 150 degrees. From the viewpoint of effectively preventing \¥02020/174893 19 卩 (: 171?2020/000611

In the case of the ceramic structure 1 of the embodiment shown in FIG. 8 (3), the first linear portion 10 or the third linear portion 30 may be arranged in parallel with the straight side portion. preferable. In this case, the fact that the second linear portion 20 intersects with the straight side portion at the angle described above is more effective from the viewpoint of effectively preventing the propagation of defects such as cracks generated in the ceramic structure 18. preferable.

In the case of the ceramic structure 1m of the embodiment shown in FIG. 9 ( ₃ ), it is preferable that the third linear portions 30 are arranged in parallel with the straight side portions. In this case, it is preferable that the second linear portion intersects with the straight side portion at the above-mentioned angle from the viewpoint of effectively preventing the propagation of defects such as cracks generated in the ceramic structure 1.

Further, the ceramic structure of each of the above-described embodiments may be provided with an outer frame (not shown) on the outer periphery of the structure for the purpose of improving its strength. The outer frame may be integrally formed from the same material as the structure, or may be manufactured separately from the structure and joined by a predetermined joining means. The outer frame may have a constant width, or may have a wide portion and a narrow portion. If the width of the outer frame is constant, the width is 0.

The following is preferable. If the width of the outer frame is not constant, the width is 1 at the widest part.

The following is preferable, and in the narrowest part

〇 It is preferable that it is not less than 5 01 01 and not more than 1 01 01.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments. For example, in each of the above-described embodiments, three types of linear portions, which are composed of the first, second, and third linear portions 10, 20, and 30, are used, and three layers form one unit. However, instead of this structure, two or more repeating units composed of the first, second and third linear portions 10, 20 and 30 are laminated to form a structure. May be formed.

Further, in the embodiment shown in FIG. 1, the first linear portion 10 is arranged below the third linear portion 30 or the third linear portion 10 is arranged above the third linear portion 10. You may arrange a line part. Similarly, in the embodiment shown in FIG. 8( a ), the first linear portion 10 \¥02020/174893 20 ((171?2020/000611

The third linear portion 30 may be arranged on the lower side, or the first linear portion 10 may be arranged on the third linear portion 30. Further, similarly, in the embodiment shown in FIG. 9( a ), the first linear portion 10 is arranged below the second linear portion 20 and the first linear portion 10 is arranged. You may arrange|position the 2nd linear part 20 above.

Example

[0060] Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the invention is not limited to such examples. Unless otherwise specified, "part" means "part by mass". The morphology of the ceramic structure, the number of laminated filaments, the distance between filaments, the mass, etc. are as shown in Table 1.

[0061] [Example 1]

In this example, the flat plate-shaped ceramic structure 1 shown in FIG. 1 was manufactured.

(1) Preparation of paste for forming filament coating

Fully stabilized zirconia powder with 8 mol% yttria having an average particle size of 0.8 65.3 parts, methyl cellulose binder 5.0 parts as a water-based binder, and glycerin 2.5 parts as a plasticizer, A paste was prepared by mixing 1.1 parts of a carboxylic acid-based dispersant (molecular weight 12000) with 26.1 parts of water and defoaming. The viscosity of the paste was 2.0^\9 a-3 at 25 °.

(2) Formation of filament coating

Using the above paste as a raw material, diameter 0.8

Using a small extruder with a nozzle of 2°, form a line 3rd coated body on the resin substrate under the environment of 25° and continue to intersect the line 2nd coated body and the line. A first coated body was formed. The intersecting angle between the second filament-coated body and the first filament-coated body was set to 60° so that a rhombic lattice was formed. The line-shaped third coated body was designed to pass on the shorter diagonal line of the diamond-shaped diagonal lines. In this way, a pre-fired structure was obtained.

(3) Firing process

After drying, the structure before firing was separated from the resin substrate, and then placed in an air-fired furnace. Degreasing and firing were performed in this firing furnace to obtain a rectangular ceramic structure having the shape shown in Fig. 1. The firing temperature was 1600 ^° and the firing time was 3 hours. \\02020/174893 21 ((171?2020/000611

The specifications of the obtained structure are shown in Table 1 below. In this structure, the third linear portion was parallel to the straight side portion.

The first linear portion 10 of the structure thus obtained has a width 1 of 4 25 and a thickness 1 of 400, and the second linear portion 20 of the structure has a width \^ / 2 is 4 2 0, thickness 2 is 41 0, and the third linear portion 30 of the structure has width \^/ 3 of 4 2 5 and thickness 3 of 4 10. It was The thickness of the intersection 2 was 1160.

[Example 2]

In this example, a flat plate-shaped ceramic structure 1 shown in FIG. 8 ( ₃ ) was manufactured.

Using the same paste as in Example 1 as the raw material, the diameter 〇.

Using a small extruder with a nozzle of 25 ^° 〇, form a linear strip No. 1 coated body on a resin substrate and continue to intersect it with a linear strip No. 2 coated body and linear strip No. 3 The coated body was formed. The angle of intersection between the filament-shaped second coated body and the filament-shaped first coated body was set to 60° so that a diamond-shaped crystal was formed. The line-shaped third coated body was designed to pass on the shorter diagonal line of the diamond-shaped diagonal lines. Otherwise in the same manner as in Example 1, a rectangular ceramic structure having the shape shown in FIG. 8(a) was obtained. The specifications of the obtained structure are shown in Table 1 below. In this structure, the third linear portion was parallel to the straight side portion.

[0063] [Example 3]

In this example, a flat ceramic structure 1 shown in FIG. 9 ( ₃ ) was manufactured.

Using the same paste as in Example 1 as the raw material, the diameter 〇.

Using a small extruder having the nozzle of 25°○, form a line 2nd coated body on the resin substrate, and then continue to intersect the line 3rd coated body and line 1st line. The coated body was formed. The angle of intersection between the filament-shaped second coated body and the filament-shaped first coated body was set to 60° so that a diamond-shaped crystal was formed. The line-shaped third coated body was designed to pass on the shorter diagonal line of the diamond-shaped diagonal lines. Other than that, as in the case of Example 1, as shown in FIG. \¥0 2020/174893 22 卩 (: 171? 2020 /000611

A rectangular ceramic structure having the shape shown in a) was obtained. The specifications of the obtained structure are shown in Table 1 below. In this structure, the third linear portion was parallel to the straight side portion.

[0064] [Comparative Example 1]

In this comparative example, a lattice-shaped ceramic structure was manufactured.

Using the same paste as in Example 1 as the raw material, the diameter 〇.

Using a small extruder with the nozzle of No. 2, under the environment of 25 ^° , the first linear filament coating was formed on the resin substrate, and then the second linear filament coating was formed orthogonal thereto. On this, a linear first coating and a linear second coating were formed, and a lattice-shaped pre-fired structure consisting of a total of four layers of coating was obtained. The first linear portions and the second linear portions is set to orthogonal to that angle 9 0 ^°, the crossing angle of the linear edge portion and the ridges are 〇 ^° and (parallel) to 9 0 ^° (Cartesian) It was arranged so that A rectangular ceramic structure was obtained in the same manner as in Example 1 except for the above. The specifications of the obtained structure are shown in Table 1 below.

[Comparative Example 2]

Using the same paste as in Example 1 as the raw material, the diameter 〇.

Using a small extruder with the nozzle of No. 2, under the environment of 25 ^° , the first linear filament coating was formed on the resin substrate, and then the second linear filament coating was formed orthogonal thereto. A linear first coating body was formed thereon, and a lattice-shaped pre-fired structure consisting of a total of three layers of coating bodies was obtained. The first linear part and the second linear part are orthogonal to each other at 90 ^° , and the crossing angle between the side part and each linear part is 0 ^° (parallel) or 90 ^° (orthogonal). did . A rectangular ceramic structure was obtained in the same manner as in Example 1 except for the above. The specifications of the obtained structure are shown in Table 1 below.

[Examples 4 to 6 and Comparative Examples 3 and 4]

Ceramic structures were obtained in the same manner as in Examples 1 to 3 and Comparative Example 2 except that the width of the filaments and the distance between the filaments were as shown in Table 1.

[0067] [Evaluation]

For the ceramic structures obtained in the examples and comparative examples, the following method was used. \\02020/174893 23 ((171?2020/000611

The thermal shock resistance temperature and strength were measured. The results are shown in Table 1.

[0068] [Heat-resistant shock temperature]

Put the ceramic structure in the firing furnace, hold it for 1 hour, and then immediately take it out into the atmosphere and quench it. Check for cracks after the ceramic structure has returned to room temperature. The evaluation starts from 200 ^° 〇, and if there is no crack, raise the set temperature of the firing furnace by 25 ^° 〇 and repeat the test. The thermal shock resistance temperature is defined as the upper temperature limit of the furnace that maintains durability without cracking.

[0069] [Strength Evaluation 1]

The strength of the obtained ceramic structure was evaluated. For the ceramic structures obtained in the examples, the strength when bent in a direction parallel to the straight side portion where the third linear portion intersects was obtained. For the ceramic structures obtained in the comparative examples, the strength when bent in a direction orthogonal to the first linear portion having two layers was obtained. A 4-point bending test was used for strength evaluation. The 4-point bending test conformed to the test method of room temperature bending strength of fine ceramics. At this time, the cross-sectional area was calculated from the width and thickness of the structure.

[0070] [Strength evaluation 2]

For the obtained ceramic structures, for Example 1 and Comparative Example 2, the strength in the direction orthogonal to Strength Evaluation 1 was also measured.

[0071]

[¾ji

\\0 2020/174893 25 卩 (: 171? 2020 /000611

I understand that It is also found that the mass can be lightened in the example, even though the width and the interval of the filaments are the same in the example and the comparative example. Moreover, it can be seen that the example is superior to the comparative example in thermal shock resistance and strength, although the mass is lighter.

Further, in Example 1, the strength in Strength Evaluation 2 was a slight decrease of 12% compared to the strength in Strength Evaluation 1, but in Comparative Example 2 it was decreased by 13.5%, showing a large anisotropy. Was observed. Therefore, it was found that the examples also have excellent strength anisotropy.

Industrial availability

According to the present invention, it is possible to obtain a ceramic structure having higher strength than conventional ones.

Further, according to the present invention, a ceramic structure having a higher thermal shock resistance than the conventional one can be obtained.

Claims

\¥02020/174893 26 range (: 171?2020/000611 Claims

[Claim 1] — A plurality of first filament portions made of ceramics extending in a direction and a plurality of second filament portions made of ceramics extending in a direction intersecting with the first filament portions. And a third filament portion made of ceramics that passes on the diagonal of a quadrangle defined by the intersection of the first filament portion and the second filament portion,

A plate-shaped ceramic structure in which a plurality of triangular through holes defined by the first linear portion, the second linear portion and the third linear portion are formed.

[Claim 2] The ceramic according to claim 1, wherein the second linear portion is arranged on the third linear portion, and the first linear portion is arranged on the second linear portion. Structure.

[Claim 3] The first linear portion, the second linear portion, and the third linear portion intersect at one intersection,

At any of the intersections, the second linear portion is arranged on the third linear portion,

3. The ceramic structure according to claim 2, wherein the first linear portion is arranged on the second linear portion at any of the intersections.

[Claim 4] The cross section of the second linear portion has a circular or elliptical shape in a portion other than the intersecting portion,

4. The ceramic structure according to claim 3, wherein a cross section of the first linear portion has a circular shape or an elliptical shape at a portion other than the intersecting portion.

[Claim 5] The ceramic according to claim 1, wherein the second linear portion is arranged on the first linear portion, and the third linear portion is arranged on the second linear portion. Structure.

[Claim 6] The first linear portion, the second linear portion, and the third linear portion intersect at one intersection,

At any of the intersections, the second linear portion is arranged on the first linear portion, \\02020/174893 27 卩 (: 171?2020/000611

6. The ceramic structure according to claim 5, wherein at any of the intersecting portions, the third linear portion is arranged on the second linear portion.

[Claim 7] The cross section of the second linear portion has a circular or elliptical shape in a portion other than the intersecting portion,

7. The ceramic structure according to claim 6, wherein a cross section of the third linear portion has a circular shape or an elliptical shape at a portion other than the intersecting portion.

[Claim 8] At least a part of the contour in plan view has a straight side portion,

8. The linear portion of any one of the first linear portion, the second linear portion and the third linear portion is arranged in parallel with the linear portion, according to any one of claims 1 to 7. The ceramic structure according to item 1.

[Claim 9] The ceramic structure according to claim 8, wherein the first linear portion or the third linear portion is arranged in parallel with the straight side portion.

[Claim 10] Any one of claims 1 to 9 in which two or more repeating units composed of the first linear portion, the second linear portion and the third linear portion are laminated. A ceramic structure according to item 4.