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Silicon carbide ceramic upper pressure head of high-temperature bending resistance testing machine, preparation method thereof and die

A technology of silicon carbide ceramics and testing machines, which is applied in the direction of molds, manufacturing tools, ceramic molding machines, etc., can solve the problems of large machining allowance, large size, large shrinkage, etc., and achieve improved operation mode, strong practicability, and simple improvement Effect

Inactive Publication Date: 2019-12-20
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the indenter on the high-temperature flexural testing machine is in the shape of a long rod, and the normal-pressure solid-phase sintered silicon carbide ceramics shrinks greatly during the sintering process, the size of the dry-pressed mold is relatively large if the dry-pressing-isostatic pressing method is used. If rubber or polyurethane glue is used If the sleeve is directly isostatically pressed, a large machining allowance will be generated

Method used

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  • Silicon carbide ceramic upper pressure head of high-temperature bending resistance testing machine, preparation method thereof and die
  • Silicon carbide ceramic upper pressure head of high-temperature bending resistance testing machine, preparation method thereof and die
  • Silicon carbide ceramic upper pressure head of high-temperature bending resistance testing machine, preparation method thereof and die

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Embodiment 1

[0064] In the present invention, the upper pressure head of silicon carbide ceramics for high-temperature flexural testing machine and the preparation method thereof, the specific process steps are as follows:

[0065] A: Molding: Put the inner mold cover tightly into the outer mold of aluminum alloy (the thickness of the inner / outer mold cover is 0.20mm, the inner diameter is 110mm, and the height is 700mm), and the upper cover plate (thickness 5mm, material 304 stainless steel). 8mm holes are evenly arranged on the outer wall of the aluminum alloy outer mold, and the distribution density is 5% of the outer peripheral area of ​​the mold main body. Put the silicon carbide spray granulation powder into the inner mold sleeve, solid and full, then use a heat sealer to seal it, and put the whole mold into a cold isostatic press for direct compression;

[0066] B: Drying: put the shaped blank into an oven for drying;

[0067] C: Biscuit processing: use CNC machine tools to mechani...

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Abstract

The invention provides a silicon carbide ceramic upper pressure head of a high-temperature bending resistance testing machine, a preparation method thereof and a die, and particularly relates to an isostatic pressing die for a long rod-shaped ceramic biscuit. The isostatic pressing die comprises a die main body (1), a plastic film lining (6) closely attached to the inner surface of the die main body (1), and an upper cover plate (3) for sealing the die main body (1), wherein the plastic film lining is made of polyethylene; and the die main body is cylindrical barrel-shaped, sieve holes (2) areuniformly distributed in the whole die main body, and the lower end of the die main body is provided with a bottom.

Description

technical field [0001] The invention relates to a silicon carbide ceramic upper indenter of a high-temperature flexural testing machine, a preparation method and a mould, belonging to the technical field of engineering ceramic materials. Background technique [0002] Refractory materials are indispensable basic materials for the manufacture of high-temperature industrial kiln linings and devices and components used at high temperatures. Some important indicators need to be tested before they are put into use, among which the flexural strength test is a very important indicator. The upper pressure head of the original refractory material high-temperature flexural testing machine is usually made of recrystallized silicon carbide, silicon nitride combined with silicon carbide, etc. The strength decreases rapidly, the service life decreases, and it is increasingly unable to meet the high-temperature flexural strength test requirements of high-strength refractory materials. Comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/00B28B11/24B28B7/00B28B7/36
CPCB28B3/003B28B7/0097B28B7/364B28B11/243
Inventor 张玉强陈忠明刘学建桑志财许成明黄政仁
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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