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Method for preparing highly heat-conductive carbon/ceramic composite material

A ceramic composite material and high thermal conductivity technology, applied in the field of preparation of high thermal conductivity carbon/ceramic composite materials, can solve the problems of limited space for improving thermal conductivity of carbon/ceramic composite materials, poor structural uniformity, high porosity, etc. The preparation process cycle is short, the cost is low, and the thermal conductivity is good.

Active Publication Date: 2008-09-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the above method, more than one-third of the binder is decomposed and volatilized during the roasting process, resulting in the carbon / ceramic composite material inevitably having disadvantages such as high porosity, poor structure uniformity, and obvious interface. As a result, the space for improving the thermal conductivity of the final carbon / ceramic composite is also limited to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First, the natural flake graphite, mesophase pitch, and Si and Ti powders are put into a mixer in a ratio of 57:27:4:12 (wt%) for thorough mixing. Among them, the particle size of natural flake graphite is 350 μm, and the carbon content is 98%; the softening point of mesophase pitch is 280°C, the residual carbon rate is 89.7wt%, and the particle size is 105 μm; the particle size of Si powder and Ti powder are 30 μm and 45 μm, respectively, and the purity is average 99.3%. Then the uniformly mixed raw materials were put into a ball mill, and distilled water and polyvinyl alcohol were introduced into the ball mill for 1.5 hours at the same time, and then vacuum-dried to remove the solvent. Finally, put it into a graphite mold, heat up to 2800°C at a rate of 450°C / h, and pressurize to 30MPa at the highest temperature. After natural cooling, the basic physical properties of the final material are shown in Table 1.

Embodiment 2

[0012] First, the natural flake graphite, mesophase pitch, and Si and Ti powders are put into a mixer in a ratio of 56:28:4:12 (wt%) for thorough mixing. Among them, the particle size of natural flake graphite is 201 μm, and the carbon content is 97.3%; the softening point of mesophase pitch is 266°C, the residual carbon rate is 85.7wt%, and the particle size is 105 μm; the particle size of Si powder and Ti powder are 35 μm and 45 μm respectively, and the purity is average. 99.3%. Then put the homogeneously mixed raw materials into a ball mill, introduce distilled water and polyvinyl alcohol into the ball mill for 3 hours at the same time, and then carry out vacuum drying to remove the solvent. Finally, put it into a graphite mold, heat up to 2800°C at a rate of 400°C / h, and pressurize to 30MPa at the highest temperature. After natural cooling, the basic physical properties of the final material are shown in Table 1.

Embodiment 3

[0014] Firstly, the natural flake graphite, mesophase pitch and Si and Ti powders are placed in a mixer in a ratio of 52:28:5:15 (wt%) for thorough mixing. Among them, the particle size of natural flake graphite is 146 μm, and the carbon content is 97.3%; the softening point of mesophase pitch is 280°C, the residual carbon rate is 89wt%, and the particle size is 105 μm; the particle size of Si powder and Ti powder are 25 μm and 45 μm, respectively, and the purity is 99.3%. Then put the homogeneously mixed raw materials into a ball mill, and introduce distilled water and polyvinyl alcohol into the ball mill for 2.5 hours at the same time, and then carry out vacuum drying to remove the solvent. Finally, put it into a graphite mold, heat up to 2800°C at a rate of 500°C / h, and pressurize to 20MPa at the highest temperature. After natural cooling, the basic physical properties of the final material are shown in Table 1.

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Abstract

The invention discloses a preparing method of high-conductive coke / ceramic composite material, which comprises the following steps: allocating raw material with 50-65% natural scale graphite, 25-32% middle-phase tar, 2.5-5% Si powder, 5-15% Ti powder; blending these materials evenly; placing mixed raw material into ball grinder; introducing distilled water and polyvinyl alcohol to ball 1-3h; drying in the vacuum; removing solvent; heating to 2600-2800 Deg C at 200-600Deg C / h; pressurizing to 20-40Mpa under maximum high temperature.

Description

technical field [0001] The invention belongs to a preparation method of high thermal conductivity carbon / ceramic composite material. Background technique [0002] Carbon materials have been widely used in chemical industry, metallurgy, electronics and other fields due to their good thermal conductivity and electrical conductivity. However, in some special application fields, such as heat dissipation components of aviation and aerospace instruments, structural materials of solid rocket motor nozzles, and plasma-facing materials in nuclear fusion devices, higher requirements are put forward for its thermal conductivity. So far, the research hotspots of high thermal conductivity carbon materials are mainly divided into two categories: the first category is high thermal conductivity carbon fiber and C / C composite materials; the second category is carbon / ceramic composite materials. The thermal conductivity of carbon fiber and C / C composites mainly depends on the thermal conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/52C04B35/622
Inventor 郭全贵刘占军刘朗翟更太宋进仁
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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