Method for preparing sic/c ceramic composite material by hot pressing and sintering

A ceramic composite material and hot pressing sintering technology, which is applied in the field of hot pressing sintering to prepare SiC/C ceramic composite materials, can solve the problems of inability to contain, and achieve the effects of high density, excellent thermal conductivity and high mechanical strength

Active Publication Date: 2019-01-15
浙江东新新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing SiC / C ceramic composite materials by a hot pressing sintering process, which solves the problem that ceramic composite materials cannot contain elements with large neutron-absorbing interfaces in nuclear power main pumps and environments with neutron radiation

Method used

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  • Method for preparing sic/c ceramic composite material by hot pressing and sintering
  • Method for preparing sic/c ceramic composite material by hot pressing and sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1. A method for preparing a SiC / C ceramic composite material by hot pressing and sintering, followed by the following steps:

[0050] 1). Preparation of compacted body powder:

[0051] First, 91wt% of β-SiC (D50=0.8μm, purity ≥99%), 8wt% of aluminum nitride powder (D50=1.0μm, purity ≥99%) and 1wt% of dispersant polyethylene glycol 400 are mixed As a base material, it is added to a stirring mill lined with polyurethane, 50wt% of the base material is added with absolute ethanol, and after high-speed stirring (rotating speed 120r / min) for 2h, 10wt% of the base material is sequentially added every 1.0h 2124 phenolic resin (50wt% high-temperature pyrolysis carbon residue), 8wt% of the base material with a mass concentration of 10% PVPK90 solution, 3wt% of the base material, analytical pure oleic acid, stir uniformly, and finally add 35wt% of the base material High purity graphite powder (particle size 45-120μm, purity ≥99%; and also meet the following conditions: element...

Embodiment 2

[0065] In step 1 of Example 1, "adding high-purity graphite powder accounting for 35 wt% of the base material" was changed to "adding high-purity graphite powder accounting for 45.5 wt% of the base material", and the rest was equivalent to Example 1. The performance test results are as follows: The bulk density is 2.76g / cm 3 , 20kgf air pressure detection did not show leakage phenomenon, graphite phase accounted for 49wt% of the content of other phases, the content of B, Co, Ti in the material was detected, elemental boron (B) content was 0.6ppm, metal cobalt (Co) content At 0.02ppm, the metal titanium (Ti) content is 8ppm, which meets the element content requirements of mechanical seal materials for nuclear main pumps.

Embodiment 3

[0067] Change "91wt% of submicron β-SiC, 8wt% aluminum nitride powder" in step 1 of Example 1 to "87wt% of submicron β-SiC, 12wt% aluminum nitride powder", and the rest is equivalent to the implementation Example 1, the performance test results are as follows: the bulk density is 2.85g / cm 3 , 20kgf air pressure detection did not leak, the graphite phase accounted for 35.2wt% of the content of other phases, the B, Co, Ti element content in the material was tested, the element boron (B) content was 0.5ppm, and the metal cobalt (Co) The content is 0.01ppm, and the metal titanium (Ti) content is 6ppm, both of which meet the element content requirements of mechanical seal materials for nuclear main pumps.

[0068] The various mechanical properties of the SiC / C ceramic composite materials obtained in the foregoing Examples 1 to 3 are described in Table 1 below.

[0069] Table 1

[0070]

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Abstract

The invention discloses a method for preparing a SiC / C ceramic composite material through hot pressing sintering. The method comprises the following steps: forming a base material by using 87-91% of submicron beta-SiC micro-powder, 8-12% of aluminum nitride powder and 0.5-1% of a dispersant, adding the base material to an organic solvent, uniformly stirring the base material and the organic solvent, sequentially alcohol-soluble resin, a binder, a lubricant and highly-pure nuclear graphite powder, and uniformly stirring above materials to obtain a mixture; drying the mixture, scattering the dried mixture, and carrying out sealed ageing; and sequentially carrying out green body compacting, drying, pre-burning, vehicle working and high-temperature hot press sintering on the obtained aged powder to obtain the SiC / C ceramic composite material.

Description

Technical field [0001] The invention relates to a method for preparing SiC / C ceramic composite material by hot pressing and sintering. Background technique [0002] The primary loop coolant circulation pump of the pressurized water reactor nuclear power plant (hereinafter referred to as the nuclear main pump) is the key equipment of the nuclear power plant, and the nuclear main pump plays a vital role in the safety of the entire nuclear power plant. With the development of the nuclear power industry, my country has mastered the manufacturing capabilities of most key nuclear power main equipment. Only the nuclear main pumps in my country’s nuclear power plants that have been put into production still mainly rely on foreign imports. The localization of nuclear main pumps is a dream pursued by generations of nuclear power generations. Realizing the localization of nuclear main pumps will further promote the rapid development of my country's nuclear power industry. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/52C04B35/64C04B35/645
CPCC04B35/522C04B35/565C04B35/64C04B35/645
Inventor 杨新领郭兴忠杨辉李志强郑浦
Owner 浙江东新新材料科技有限公司
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