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High intensity ceramic ball made from compact silicon carbide and preparation method

A silicon carbide ceramic, high-strength technology, applied in the field of high-strength dense silicon carbide ceramic balls and their preparation, can solve the problems of high cost, the mold cannot be used repeatedly, the number of sintering is limited, etc., and achieves excellent machining performance and size. Easy-to-control effects

Inactive Publication Date: 2009-04-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the mold used in the hot pressing sintering method cannot be used multiple times, the number of sintered furnaces is very limited, and there are still disadvantages such as high cost, low output, and difficulty in mass production, which directly limits the mass application of high-performance silicon carbide ceramic balls.

Method used

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  • High intensity ceramic ball made from compact silicon carbide and preparation method
  • High intensity ceramic ball made from compact silicon carbide and preparation method

Examples

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Effect test

Embodiment 1

[0039]Silicon carbide powder with an average particle size of 2 μm, epoxy resin (brand name EP0141-310), carbon fiber (diameter 10 μm, length 200 μm), p-toluenesulfonic acid, and a weight ratio of 40%:50%:5%:5%, respectively Add in absolute ethanol to make a slurry, after being uniformly stirred by a machine, the ball milling time is 1 hour, and filtered through a 55-mesh sieve to obtain a slurry, and the solid content in the slurry is 30% of the total amount of the slurry; After blowing, it becomes a material mud. After the mud is processed, it is extruded into a Φ4mm bar with an extruder, and then pressed into a silicon carbide ceramic ball green body with a Φ4 hemispherical mold. Put the spherical green body into an oven for semi-curing, the curing temperature is 60°C, and the curing time is 40 minutes; then, the spherical green body is put into a high-pressure container, filled with nitrogen to make the air pressure reach 10MPa, and the temperature is raised to 200°C, and t...

Embodiment 2

[0041] The difference from Example 1 is:

[0042] Add silicon carbide powder with an average particle size of 1.5 μm, boron phenolic resin, silicon carbide whiskers (20 μm in diameter and 150 μm in length) and pentafloxacin with a weight ratio of 55%: 35%: 5%: 5% in anhydrous In ethanol, the ball milling time is 0.5 hour after being mechanically stirred, and filtered through a 95-mesh sieve to obtain a slurry. The solid content in the slurry is 50% of the total amount of the slurry; After the mud treatment, it is extruded into a Φ10mm bar with an extruder, and then pressed into a silicon carbide ceramic ball green body with a Φ10mm hemispherical die. Put the spherical green body into an oven for semi-curing, the curing temperature is 75°C, and the curing time is 20 minutes; then, put the spherical green body into a high-pressure container, fill it with argon to make the air pressure reach 18MPa, raise the temperature to 240°C, and the heating rate 4°C / min, keep warm for 1 hou...

Embodiment 3

[0044] The difference from Example 1 is:

[0045] Silicon carbide powder, resin (thermosetting phenolic resin 40%, furfural resin 60%), silicon carbide fiber (diameter is 15 μ m, length is 500 μ m) and pentaflox pin weight ratio are 50wt%: 30wt%: 10wt%: 10wt%, Dissolve thermosetting phenolic resin, furfural resin and pentafloxacin in absolute ethanol to make a slurry solution, and then add silicon carbide powder and silicon carbide fiber with an average particle size of 5 μm into the above solution, and stir it evenly After ball milling for 1 hour, filter through a 120-mesh sieve to obtain slurry. The solid content in the slurry is 60% of the total amount of slurry; The hemispherical mold is pressed into a silicon carbide ceramic ball green body. Put the spherical green body into an oven for semi-curing, the curing temperature is 80°C, and the curing time is 5 minutes; then, put the spherical green body into a high-pressure container, fill it with argon to make the air pressu...

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Abstract

The invention provides a high-strength compact silicon carbide ceramics ball and the prodn, method. Counting on weight percentage, the material is composed by silicon carbide 90-98 and silicon 10-2. The prodn, process is mixing silicon carbide powder, resin with and preparing them to slurry, removing unnecessary alcohol by winding, which is treated by pugging and squeezing to be ball shape, then the ball is treated by high-temp, high-pressure solidifying in high-pressure container, the solidified ball-shaped presoma is pyrolized in protection furnace of vaccum or inert gas to obtain carbon ceramics ball idiosome which is ground to proper size by disc grinder, by silicizing process, carbon in the ball gas or liquid phase silicon are reacted to generate silicon carbide and combined with original silicon carbide particles, then is polished to obtain high-strength silicon carbide and combined with original silicon carbide particles, then is polished to obtain high-strength silicon carbide ceramics balls with high size precision.

Description

technical field [0001] The invention relates to a silicon carbide ceramic ball, in particular to a high-strength dense silicon carbide ceramic ball and a preparation method thereof. Background technique [0002] Based on the excellent high temperature mechanical properties, thermal properties, high temperature oxidation resistance, acid and alkali corrosion resistance and wear resistance of silicon carbide ceramic materials, silicon carbide ceramic balls are used as ceramic bearings, key parts and grinding balls of ball valves in high temperature, strong chemical corrosion, It has a very broad application prospect in various environments or working conditions such as high-speed impact resistance and material processing. [0003] High-performance dense silicon carbide ceramic balls can be made by hot pressing sintering method and hot isostatic pressing sintering method. Since the cost of the hot isostatic pressing sintering method is much higher than that of the hot pressing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/569C04B35/622C04B35/80
Inventor 张劲松曹小明田冲胡宛平
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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