CN105081289B - Compound insulation material plate - Google Patents

Abstract

The invention provides a compound insulation material plate. The compound insulation material plate comprises multiple framework units and a base body. Each framework unit is provided with a negative Poisson ratio structure, and is formed by connecting multiple first rod pieces, second rod pieces and third rod pieces with different lengths; the rod pieces are made of the same material; and the heat storage coefficient of the rod piece material meets the formula I in the specification; the refractoriness of the rod piece material is more than or equal to 1600 DEG C; the high-temperature strength of the rod piece material at a condition of 1600 DEG C is greater than or equal to 1.0 MPa; and the coefficient of thermal expansion of the rod piece material at a condition of 200 DEG C-1600 DEG C is 1.0*10＜-6＞/DEG C. The base body is adopted, so that the multiple framework units are embedded in the base body and are integral with the base body, and the heat storage coefficient of the base body meets the formula II in the specification. The negative Poisson ratio structure is adopted by the framework units, so that the framework units have high insulation performance and high temperature resistance; and the framework units generate anti-pressure ability when being stressed to deform, so that the framework units can well withstand impact and bending deflection. When the compound insulation material plate is applied to a casting process, the size of a dead head can be reduced; the dead head feeding effect can be improved; the technical yield of castings can be improved; the cleaning work of the castings is reduced; the cost is lowered; and the requirement of energy conservation and environment protection is met.

Description

Composite insulation material board

technical field

The invention relates to the technical field of large-scale steel castings, in particular to a composite thermal insulation material board.

Background technique

In the production of castings, insulation materials are often used to prolong the local solidification time of castings, so as to facilitate feeding or unblocking of feeding channels. However, for steel castings, due to the high pouring temperature of molten steel, the high-temperature mechanical properties and stability properties of thermal insulation materials such as refractoriness, sintering point, high-temperature strength, and thermal expansion coefficient are very high. Find a material that has both good thermal insulation properties and good high temperature resistance. Especially in the production of large steel castings, the solidification time of molten steel is long, and the high temperature resistance performance of thermal insulation materials is required to be higher. Therefore, in the production of large steel castings, problems such as deformation, flattening, erosion and sintering of the insulation material often occur. Composite thermal insulation materials are widely used in construction and other industries, but their application temperature is much lower than that of large steel castings, and their thermal insulation performance and size are also different from the requirements of the foundry industry. The general composite structure is mostly a layered composite or a skeleton composite in a simple form in the middle.

Contents of the invention

In view of the problems existing in the background technology, an object of the present invention is to provide a composite thermal insulation material board, which has good thermal insulation performance and high temperature resistance, and is suitable for the production of large steel castings.

Another object of the present invention is to provide a composite thermal insulation material board. Its good thermal insulation performance and high temperature resistance can reduce the size of the riser and improve the feeding effect of the riser, thereby increasing the process yield of castings; at the same time, it will also reduce The cleaning of small castings reduces costs and meets the requirements of energy conservation and environmental protection.

In order to achieve the above object, the present invention provides a composite thermal insulation material board, which includes a plurality of skeleton units and a matrix.

Each skeleton unit has a negative Poisson’s ratio, and each skeleton unit is connected by a plurality of first rods, second rods, and third rods with different lengths. The first rod, the second rod, and the third rod All use the same rod material, and the heat storage coefficient of the rod material satisfies:

In Formula I, S ₁ is the thermal storage coefficient of the rod material, in J/(m ² °C s ^1/2 ), s is seconds; λ ₁ is the thermal conductivity of the rod material, in W/( m·℃); ρ ₁ is the density of the rod material, the unit is kg/m ³ ; c ₁ is the specific heat of the rod material, the unit is J/(kg·℃).

The refractoriness of the rod material is ≥1600°C; the high temperature strength of the rod material is greater than or equal to 1.0MPa at a temperature above 1600°C; the thermal expansion coefficient of the rod material is 1.0×10 ^-6 /°C at a temperature of 200°C to 1600°C .

The matrix enables the plurality of skeleton units to be embedded in the matrix and integrated with the matrix, and the heat storage coefficient of the matrix satisfies:

In formula II, S ₂ is the heat storage coefficient of the matrix, the unit is J/(m ² °C s ^1/2 ), s is seconds; λ ₂ is the thermal conductivity of the matrix, the unit is W/(m °C) ; ρ ₂ is the density of the matrix, the unit is kg/m ³ ; c ₂ is the specific heat of the matrix, the unit is J/(kg·℃).

The beneficial effects of the present invention are as follows: in the composite thermal insulation material board of the present invention, the skeleton of the composite thermal insulation material board adopts a negative Poisson's ratio structure, which has good thermal insulation performance and high temperature resistance, and will produce compressive resistance when deformed under pressure. Therefore, it can well resist impact and bending deformation, which is very suitable for the casting process of large steel castings, but of course it is not limited thereto, and can be applied to any suitable field. At the same time, due to the good thermal insulation performance and high temperature resistance of the skeleton and matrix of the composite thermal insulation material board, when it is applied to the casting process of large steel castings, it can reduce the size of the riser and improve the feeding effect of the riser, thereby improving the casting life. The process yield rate also reduces the cleaning work of castings, reduces the cost, and conforms to energy saving and environmental protection.

Description of drawings

Fig. 1 is a perspective view of a skeleton unit of a composite insulation material board according to the present invention;

Fig. 2 is the left side view of the skeleton unit of Fig. 1;

Fig. 3 is a schematic diagram of the middle part of the frame unit in Fig. 1, and shows the relationship between the length of the rod, the total height of the frame and the angle between two connected rods.

Fig. 4 is a perspective view of the skeleton unit of the composite thermal insulation material board according to the present invention after being embedded in the base body in the inner cavity of the mold and sintered, wherein the outside is the mold, the inside is the base body, and the middle frame is the skeleton unit.

Fig. 5 is an enlarged view of the dotted box part in Fig. 4, in which only one skeleton unit same as Fig. 1 is shown for the sake of clarity.

Wherein, the reference signs are explained as follows:

1 skeleton unit

H Overall height of skeletal unit

11 First member

12 Second member

13 Third member

L1 Length of the first rod 11

L2 Length of the second rod 12

L3 The length of the third rod 13

θ Angle between the first rod 11 and the third rod 13

2 substrate

d Thickness of composite thermal insulation material board

M mold

detailed description

The composite insulation material board according to the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIGS. 1 to 5 , the composite thermal insulation material board according to the present invention includes a plurality of skeleton units 1 and a matrix 2 .

Each skeleton unit 1 has a negative Poisson's ratio, and each skeleton unit 1 is formed by connecting a plurality of first rods 11, second rods 12, and third rods 13 with different lengths. The first rods 11, the second rods Both the member 12 and the third rod member 13 are made of the same rod material, and the heat storage coefficient of the rod material satisfies:

In Formula I, S ₁ is the thermal storage coefficient of the rod material, in J/(m ² °C s ^1/2 ), s is seconds; λ ₁ is the thermal conductivity of the rod material, in W/( m·℃); ρ ₁ is the density of the rod material, the unit is kg/m ³ ; c ₁ is the specific heat of the rod material, the unit is J/(kg·℃).

The refractoriness of the rod material is equal to or greater than 1600°C; the high temperature strength of the rod material is equal to or greater than 1.0MPa at a temperature above 1600°C; the thermal expansion coefficient of the rod material is 1.0×10 ^- at a temperature of 200°C to 1600°C ⁶ /°C.

The base body 2 enables the plurality of skeleton units 1 to be embedded in the base body 2 and integrated with the base body 2, and the heat storage coefficient of the base body 2 satisfies:

In Formula II, S ₂ is the thermal storage coefficient of the substrate 2, and the unit is J/(m ² ·℃·s ^1/2 ), s is seconds; λ ₂ is the thermal conductivity coefficient of the substrate 2, and the unit is W/(m· ℃); ρ ₂ is the density of the matrix 2, the unit is kg/m ³ ; c ₂ is the specific heat of the matrix 2, the unit is J/(kg·℃).

In the composite thermal insulation material board of the present invention, the skeleton 1 of the composite thermal insulation material board adopts a negative Poisson's ratio structure, which has good thermal insulation performance and high temperature resistance performance, and will produce compression resistance when deformed under pressure, so that it can well resist Impact and bending deformation, which is very suitable for the casting process of large steel castings, of course it is not limited to this, and can be applied to any suitable field. At the same time, due to the good thermal insulation performance and high temperature resistance of the skeleton 1 and matrix 2 of the composite thermal insulation material board, when it is applied to the casting process of large steel castings, the size of the riser can be reduced and the feeding effect of the riser can be improved, thereby increasing the The process yield rate of castings also reduces the cleaning work of castings, reduces costs, and conforms to energy saving and environmental protection.

In one embodiment, each skeleton unit 1 can be a concave honeycomb structure, a hand structure, a star structure or a double arrow structure, but not limited thereto, and can also be structures of other shapes.

In one embodiment, referring to Fig. 1 to Fig. 5, each skeleton unit 1 adopts a concave honeycomb structure, in each skeleton unit 1, the first rod 11 forms two layers, and the second rod 12 is correspondingly connected between the two layers. The vertical outer side of the layer, the third bar (13) is correspondingly connected between the two layers; the thickness of the composite insulation material plate is d; the length of the first bar 11 is L1, and the length of the second bar 12 is L2, the length of the third rod 13 is L3, wherein: the total height H of each skeleton unit 1 is 1/5d～1/2d and is equal to or greater than 15mm; the first rod 11, the second rod 12, the The diameter of the three rods 13 is 1/10L3-1/5L3 and equal to or greater than 2mm; the angle θ between the connected first rod 11 and the second rod 13 is 45°-70°.

In one embodiment, the length L1 of the first rod 11 of each skeleton unit 1, the length of the second rod 12, and the length L3 of the third rod 13 can be determined by the total height H of each skeleton unit 1 and the connected first rods 11 and the angle θ between the second rod 13 is determined, and the relationship between them is:

In one embodiment, the ratio of the volume of the plurality of skeleton units 1 to the volume of the composite thermal insulation material board is less than or equal to 25%, and the ratio of the weight of the plurality of skeleton units 1 to the weight of the composite thermal insulation material board is less than or equal to Equal to 30%.

In one embodiment, the rod material of each skeleton unit 1 can be quartz sand, but it is not limited to this, and other materials can also be selected as required.

In one embodiment, the material of the matrix (2) is perlite, but it is not limited to this, and other materials can also be selected as required.

In one embodiment, referring to Fig. 4 and Fig. 5, the plurality of skeleton units 1 are tiled along the x and y directions, and stacked into a conjoined layered structure along the Z direction, and the plurality of skeleton units 1 are stacked The formed conjoined layered structure is integrally generated by 3D printing, and the conjoined layered structure formed by stacking the plurality of skeleton units 1 is embedded in the base body 2 and integrated with the base body 2 to form a composite thermal insulation material board.

In one embodiment, referring to Fig. 4 and Fig. 5, the forming process of the composite thermal insulation material board is as follows: the conjoined layered structure formed by stacking the plurality of skeleton units 1 is placed in the cavity of a mold M , the matrix 2 is added into the mold cavity in the form of filler, filling the cavity of the conjoined layered structure formed by stacking the plurality of skeleton units 1 and covering the conjoined layered structure formed by stacking the plurality of skeleton units 1 , then vibrate the mold M to shake the filler, and finally put the mold M into a sintering furnace for sintering, and finally the conjoined layered structure formed by stacking the plurality of skeleton units 1 is buried in the matrix 2 and integrated with the matrix 2 Composite insulation board.

In one embodiment, the matrix 2 is added into the mold cavity in the form of paste filling.

Claims (10)

1. a kind of compound insulating material plate, it is characterised in that include：

Multiple skeleton unit (1), each skeleton unit (1) has a negative poisson's ratio, each skeleton unit (1) by many length it is different the One rod member (11), the second rod member (12), the 3rd rod member (13) are formed by connecting, the first rod member (11), the second rod member (12), the 3rd bar Part (13) adopts the heat storage coefficient of bar material of the same race, the bar material to meet：

In Formulas I, S₁For the heat storage coefficient of bar material, unit is J/ (m²·℃·s^1/2), s is the second；λ₁Leading for bar material Hot coefficient, unit are W/ (m DEG C)；ρ₁For the density of bar material, unit is kg/m³；c₁For the specific heat of bar material, unit For J/ (kg DEG C)；

Refractoriness >=1600 DEG C of bar material；

The elevated temperature strength of bar material more than 1600 DEG C under conditions of be more than or equal to 1.0MPa；

The thermal coefficient of expansion of bar material is 1.0 × 10 under the conditions of 200 DEG C～1600 DEG C^-6/℃；And

Matrix (2), makes the plurality of skeleton unit (1) be embedded in matrix (2) and be integrally formed with matrix (2), and matrix (2) Heat storage coefficient meet：

In Formula II, S₂Based on (2) heat storage coefficient, unit be J/ (m²·℃·s^1/2), s is the second；λ₂Based on (2) heat conduction Coefficient, unit are W/ (m DEG C)；ρ₂Based on (2) density, unit is kg/m³；c₂Based on (2) specific heat, unit is J/ (kg·℃)。

2. compound insulating material plate according to claim 1, it is characterised in that each skeleton unit (1) is indent honeycomb knot Structure, hand structure, star structure or double-head arrow shape structure.

3. compound insulating material plate according to claim 1, it is characterised in that

Each skeleton unit (1) adopts indent honeycomb texture, in each skeleton unit (1), the first rod member (11) formation two-layer, and second Rod member (12) correspondence is connected to the vertical outside of the two-layer, and the 3rd rod member (13) correspondence is connected between the two-layer：

The thickness of slab of compound insulating material plate is d；

The length of the first rod member (11) is L1, the length of the second rod member (12) is L2, the length of the 3rd rod member (13) is L3；

The overall height H of each skeleton unit (1) is 1/5d～1/2d and is equal to or more than 15mm；

First rod member (11), the second rod member (12), a diameter of 1/10L3～1/5L3 of the 3rd rod member (13) and it is equal to or more than 2mm；

Angle theta between first rod member (11) and the second rod member (13) of connection is 45 °～70 °.

4. compound insulating material plate according to claim 3, it is characterised in that first rod member of each skeleton unit (1) (11) length L1, length L2 of the second rod member (12), the 3rd rod member (13) length L3 by each skeleton unit (1) total height Angle theta between H and first rod member (11) and the 3rd rod member (13) of connection determines that the relational expression between them is：

。

5. compound insulating material plate according to claim 1, it is characterised in that

The volume of the plurality of skeleton unit (1) is less than or equal to 25% with the ratio of the volume of compound insulating material plate；

The weight of the plurality of skeleton unit (1) is less than or equal to 30% with the weight ratio of compound insulating material plate.

6. compound insulating material plate according to claim 1, it is characterised in that the bar material of each skeleton unit (1) is Quartz sand.

7. compound insulating material plate according to claim 1, it is characterised in that the material of matrix (2) is perlite.

8. compound insulating material plate according to claim 1, it is characterised in that the plurality of skeleton unit (1) is along x and y Direction is tiled, and is stacked to disjunctor layer structure, the disjunctor layer structure that the plurality of skeleton unit (1) is stacked to along Z-direction Generated using 3D printing integration, the disjunctor layer structure that the plurality of skeleton unit (1) is stacked to is embedded in matrix (2) simultaneously Compound insulating material plate is integrally formed with matrix (2).

9. the compound insulating material plate according to any one of claim 1-8, it is characterised in that the compound insulating material The forming process of plate is：The disjunctor layer structure that the plurality of skeleton unit (1) is stacked to is placed in into the die cavity of a mould (M) Interior, matrix (2) is added in die cavity, is filled the disjunctor layer structure that the plurality of skeleton unit (1) is stacked in filler mode Cavity and cover the disjunctor layer structure that the plurality of skeleton unit (1) is stacked to, afterwards by vibrating mould (M) come ram-jolt Filler, is finally put into mould (M) in sintering furnace and sinters, the disjunctor stratiform knot that final the plurality of skeleton unit (1) is stacked to Structure is embedded in matrix (2) and is integrally formed compound insulating material plate with matrix (2).

10. compound insulating material plate according to claim 9, it is characterised in that matrix (2) is added in paste filler mode To in die cavity.