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Preparation method of high-density silicon carbide composite

A composite material and silicon carbide technology, which is applied in the field of composite material processing, can solve the problems of material uniformity, low repeatability index of weibull modulus, reduced machinability and application reliability, and low room temperature strength of SiC ceramics, etc., to achieve improvement Effects of quality stability and strength, increased raw material cost, and shortened degreasing cycle

Inactive Publication Date: 2017-01-11
NINGBO DONGLIAN MECHANICAL SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although reaction sintered silicon carbide has many advantages, the room temperature strength of SiC ceramics is relatively low, and the fracture toughness is poor. Silicon is essentially a brittle material, which is prone to brittle fracture, which reduces its machinability and application reliability to a certain extent. Therefore, the preparation of SiC-based composite ceramics with high density and high strength and fracture toughness has always been an important aspect of SiC ceramics. The main direction of research development

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  • Preparation method of high-density silicon carbide composite

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Embodiment 1

[0029] In this embodiment, the preparation method of the high-density silicon carbide composite material includes the following steps:

[0030] 1), the main material is passed through a 70-mesh sieve after primary ball milling in water accounting for 22% of the total main material (add 0.3 parts by weight of a dispersant and perform secondary ball milling) to obtain a finished slurry, wherein the main material includes 50 parts by weight of SiC pellets and 0.4 parts by weight B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.8μm, B4 The size of the C pellets was 3.0 μm.

[0031] 2), add auxiliary materials to the finished slurry product obtained in step 1) to prepare the slurry before casting (add methylenebisacrylamide first, then adjust the pH of the slurry to 10-11 with tetramethylammonium hydroxide, and then Add ammonium polyacrylate), keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisa...

Embodiment 2

[0037] In this embodiment, the preparation method of the high-density silicon carbide composite material includes the following steps:

[0038] 1), the main ingredient is passed through a 65-mesh sieve after primary ball milling in water accounting for 23% of the total amount of the main ingredient (add 0.3 parts by weight of a dispersant and perform secondary ball milling) to obtain a finished slurry, wherein the main ingredient includes 48 parts by weight of SiC pellets and 0.4 parts by weight B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.7μm, B 4 The size of the C pellets was 3.1 μm.

[0039] 2), add auxiliary materials to the finished slurry product obtained in step 1) to prepare the slurry before casting (add methylenebisacrylamide first, then adjust the pH of the slurry to 10-11 with tetramethylammonium hydroxide, and then Add ammonium polyacrylate), keep stirring when adding, wherein the auxiliary materials include acr...

Embodiment 3

[0044] In this embodiment, the preparation method of the high-density silicon carbide composite material includes the following steps:

[0045] 1), the main ingredient is passed through a 75-mesh sieve after a ball mill in water accounting for 24% of the total amount of the main ingredient (add 0.1-0.4 parts by weight of a dispersant and carry out secondary ball milling) to obtain a finished slurry, wherein the main ingredient includes 52 wt. Parts of SiC pellets and 0.6 parts by weight of B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.75 μm, B 4 The size of the C pellets was 2.9 μm.

[0046] 2), add auxiliary materials to the finished slurry product obtained in step 1) to prepare the slurry before casting (add methylenebisacrylamide first, then adjust the pH of the slurry to 10-11 with tetramethylammonium hydroxide, and then Add ammonium polyacrylate), keep stirring when adding, wherein the auxiliary materials include acrylam...

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Abstract

The invention relates to a preparation method of a high-density silicon carbide composite and belongs to the technical field of composite processing. The method comprises steps as follows: main materials become a slurry finished product after being treated, the main materials comprise SiC granules and B4C granules, and the B4C granules are taken as a sintering aid; auxiliary materials are added to the slurry finished product, pre-casting slurry is prepared, and the auxiliary materials comprise acrylamide, methylene bisacrylamide and ammonium polyacrylate; ammonium persulfate is added to the pre-casting slurry, the mixture is stirred uniformly and subjected to forming, and a blank body is obtained; the blank body is firstly subjected to solvent degreasing and then subjected to thermal degreasing; the degreased blank body is sintered under the vibration pressure at the temperature of 2,000-2,100 DEG C, and the high-density silicon carbide composite is obtained finally. The prepared silicon carbide composite is uniform and stable in structure and quality, high in density and high in controllability and also has better toughness and strength.

Description

technical field [0001] The invention relates to a method for preparing a high-density silicon carbide composite material, which belongs to the technical field of composite material processing. Background technique [0002] Silicon carbide (SiC) ceramics, as a typical covalently bonded ceramic material, has high high-temperature strength, low high-temperature creep, high hardness, wear resistance, corrosion resistance, oxidation resistance, high thermal conductivity and high electrical conductivity. With the characteristics of high efficiency and good thermal stability, it has been widely used in high-tech fields such as machinery, chemical industry, energy, and military industry. At present, most of the ceramics that have been widely used are oxide ceramics, but they have disadvantages such as poor high temperature performance and insufficient corrosion resistance, and silicon carbide ceramics can just make up for these deficiencies. In addition, many special fields put for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/632C04B35/634C04B35/638C04B35/645
CPCC04B35/565C04B35/632C04B35/63404C04B35/638C04B35/645C04B2235/3821C04B2235/6022C04B2235/6562
Inventor 李友宝励永平叶传剑
Owner NINGBO DONGLIAN MECHANICAL SEAL
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