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SiBCN composite ceramic powder and preparation method thereof

A composite ceramic and powder technology, applied in the field of composite ceramic powder, can solve the problems of low product purity and organizational uniformity, expensive organic reagents, difficult mass production, etc., and achieves good thermal stability and organizational stability, good organization The effect of stability, good thermal stability

Active Publication Date: 2019-07-05
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw materials of the organic precursor method contain boron source organic substances such as polysilicon boron that are not easy to preserve, and the requirements for the experimental conditions and instruments in the reaction process are high, the operation is relatively complicated, and the organic reagents required for the experiment are expensive, resulting in high overall production costs. At the same time, the low output makes it difficult to produce on a large scale; the purity and uniformity of the product produced by the mechanical alloying method are low, and the overall time-consuming is long. In addition, the B element and the N element are added in the form of BN in the mechanical alloying method. Low degree of component adjustment

Method used

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  • SiBCN composite ceramic powder and preparation method thereof
  • SiBCN composite ceramic powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] A SiBCN composite ceramic powder and a preparation method thereof. The preparation method described in this embodiment is:

[0025] According to the Si:B molar ratio of 0.1~0.4:1, boron carbide and silicon powder are mixed to obtain a borosilicate mixture; then according to the C:B molar ratio of 0.5~0.7:1, the carbon source material is added to borosilicate The mixture is mixed and pressed into a green body; then the green body is placed in an atmosphere furnace, heated to 1500°C-1600°C at a heating rate of 3-5°C / min in a nitrogen atmosphere, and kept for 2-8 hours. Naturally cool to room temperature with the furnace, take out the fired green body, and grind to obtain SiBCN composite ceramic powder.

[0026] The carbon source material is starch, glucose and cellulose.

[0027] The phase composition of the SiBCN composite ceramic powder prepared in this example is β-SiC / SiCN, α-SiC, BN and B 4 c.

Embodiment 2

[0029] A SiBCN composite ceramic powder and a preparation method thereof. The preparation method described in this embodiment is:

[0030] According to the Si:B molar ratio of 0.1~0.4:1, boron carbide and silicon powder are mixed to obtain a borosilicate mixture; then according to the C:B molar ratio of 0.7~1:1, the carbon source material is added to the borosilicate The mixture is mixed and pressed into a green body; then the green body is placed in an atmosphere furnace, heated to 1500°C-1600°C at a heating rate of 3-5°C / min in a nitrogen atmosphere, and kept for 2-8 hours. Naturally cool to room temperature with the furnace, take out the fired green body, and grind to obtain SiBCN composite ceramic powder.

[0031] The carbon source material is starch, glucose and cellulose.

[0032] The phase composition of the SiBCN composite ceramic powder prepared in this example is β-SiC / SiCN, α-SiC, BN and B 4 c.

Embodiment 3

[0034] A SiBCN composite ceramic powder and a preparation method thereof. The preparation method described in this embodiment is:

[0035] According to the Si:B molar ratio of 0.4~0.7:1, boron carbide and silicon powder are mixed to obtain a borosilicate mixture; then according to the C:B molar ratio of 0.5~0.7:1, the carbon source material is added to borosilicate The mixture is mixed and pressed into a green body; then the green body is placed in an atmosphere furnace, heated to 1550°C-1650°C at a heating rate of 3-5°C / min in a nitrogen atmosphere, and kept for 2-8 hours. Naturally cool to room temperature with the furnace, take out the fired green body, and grind to obtain SiBCN composite ceramic powder.

[0036] The carbon source material is starch, glucose and cellulose.

[0037] The phase composition of the SiBCN composite ceramic powder prepared in this example is β-SiC / SiCN, α-SiC, BN, B 4 C and Si.

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Abstract

The invention relates to a SiBCN composite ceramic powder and a preparation method thereof. The preparation method comprises following steps: mixing boron carbide with silicon powder to obtain a boron-silicon mixture according to a Si / B mole ratio of 0.1-1:1; adding a carbon source material into the boron-silicon mixture according to a C / B mole ratio of 0.5-1:1; mixing, pressing the mixture to obtain a blank; placing the blank in an atmosphere furnace, heating the blank to a temperature of 1500 to 1700 DEG C at a speed of 3 to 5 DEG C / min in a nitrogen atmosphere, maintaining the temperature for 2 to 8 hours, naturally cooling the blank in the furnace to the room temperature, taking out the sintered blank, and grinding the blank to obtain the SiBCN composite ceramic powder. The technologyis simple and environmentally friendly, the cost is low, and the components are controllable. The prepared SiBCN composite ceramic powder has good thermal stability and tissue stability.

Description

technical field [0001] The invention belongs to the technical field of composite ceramic powder. Specifically relates to a SiBCN composite ceramic powder and a preparation method thereof. Background technique [0002] SiCN ceramic materials are superior to binary compositions of SiC and Si in terms of high temperature stability, fracture toughness, and high temperature creep resistance. 3 N 4 ceramic materials, but the oxidation behavior of SiCN ceramic materials is not the same as the binary composition of SiC and Si 3 N 4 Ceramic materials are similar, mainly because an oxide layer is formed on the surface of SiCN ceramic materials at 1100-1200 °C to prevent further oxidation, so the oxidation resistance of SiCN ceramic materials is not significantly better than that of binary compositions of SiC and Si 3 N 4 Ceramic material. The introduction of boron element to produce SiBCN ceramic material can significantly improve the high temperature stability of Si-C-N system,...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/626C04B35/622
CPCC04B35/58C04B35/626C04B35/622C04B2235/3821C04B2235/428C04B2235/602C04B2235/658C04B2235/656C04B2235/6567
Inventor 员文杰张聪
Owner WUHAN UNIV OF SCI & TECH