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Highly compact ceramic ball of silicon carbide and preparation process thereof

A technology of silicon carbide ceramics and silicon carbide fine powder, which is applied in the field of high-density silicon carbide ceramic balls and its preparation, can solve the problems that are not suitable for large-scale production, molds cannot be used multiple times, and the number of products is small, and it is easy to expand production , less one-time investment, high density effect

Inactive Publication Date: 2013-01-09
HENAN XINDAXIN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the number of products sintered in each furnace is small, and the mold cannot be used multiple times
[0008] (5) Hot isostatic pressing sintering method: Although the ceramic balls sintered by hot isostatic pressing have high density and good spherical shape, compared with other preparation methods, the cost is too high and the efficiency is low, so it is not suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: A preparation method of high-density silicon carbide ceramic balls, silicon carbide fine powder (phase a, median particle size 0.5um, purity greater than 98%), high carbon residual phenolic resin and sintering aid (Al 2 o 3 and Y 2 o 3 Half and half) to prepare the main raw materials in proportion, and the mass percentages of each component are: 85% silicon carbide fine powder, 10% resin, 5% sintering aid, and the following steps are carried out in sequence:

[0032] 1) Mixing: Put the main raw materials into deionized water, add binder (polyvinyl alcohol) and dispersant (tetramethylammonium hydroxide) in sequence, mix by ball milling for 12 hours, and filter through a 100-mesh screen to obtain Uniform slurry. The weight of the above-mentioned binder and dispersant is respectively 1% and 0.5% of the main raw material.

[0033] 2) Spray granulation: use a spray dryer to dry the above slurry to obtain composite granulated powder. For the spray dryer, the h...

Embodiment 2

[0037] Example 2: A method for preparing high-density silicon carbide ceramic balls. The main raw materials are made of silicon carbide fine powder, high carbon residue phenolic resin and sintering aid in proportion. The mass percentages of each component are: silicon carbide fine powder 90 %, high carbon residue phenolic resin 7%, sintering aid (B 4 C) 3%, follow the steps in turn:

[0038] 1) Mixing: Put the main raw materials into deionized water, add binder (carboxymethyl cellulose) and dispersant (polypropylene alcohol) in sequence, ball mill and mix for 18 hours, and filter through a 140-mesh screen to obtain a uniform Slurry. The weight of the above-mentioned binder and dispersant is respectively 5% and 1.5% of the main raw material.

[0039] 2) Spray granulation: use a spray dryer to dry the above slurry to obtain composite granulated powder. For the spray dryer, the hot air inlet temperature is set to 210°C, the outlet temperature is 100°C, the slurry flow rate is ...

Embodiment 3

[0043] Example 3: A method for preparing high-density silicon carbide ceramic balls. The main raw materials are made of silicon carbide fine powder, high carbon residue phenolic resin and sintering aid in proportion. The mass percentages of each component are: 95% silicon carbide fine powder Powder, 4% resin, 1% sintering aid B, follow the steps in turn:

[0044]1) Mixing: Put the main raw materials into deionized water, add binder (dextrin) and dispersant (aluminophosphate) in turn, ball mill and mix for 24 hours, and filter through a 180-mesh screen to obtain a uniform slurry . The weight of the above-mentioned binder and dispersant is respectively 10% and 3% of the main raw material.

[0045] 2) Spray granulation: use a spray dryer to dry the above slurry to obtain composite granulated powder. For the spray dryer, the hot air inlet temperature is set to 260°C, the outlet temperature is 110°C, the slurry flow rate is 80kg / h, and the speed of the atomizer is 30Hz. The gran...

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Abstract

The invention relates to a highly compact ceramic ball of silicon carbide and a preparation process thereof. The ceramic ball is prepared through carrying out steps of batch mixing, spray granulation, seed production, balling, and sintering on the following raw materials: 85-95% of a main material fine silicon carbide powder, 4-10% of a high char yield phenolic resin, 1-5% of a sintering aid, 1-10% of the weight percentage of the main material of a binder, and 0.5-3% of the weight percentage of the main material of a dispersant, wherein the binder is at least one of polyvinyl alcohol, dextrin, and carboxymethyl cellulose, and the dispersant is at least one of polyethylene glycolm, tetramethylammonium hydroxide, an aluminophosphate, and polyacrylic acid. According to the invention, active beneficial effects comprise that: 1, the ceramic ball of silicon carbide has the advantages of high density and stable chemical property; 2, the preparation process of the invention allows preparationof ceramic balls of silicon carbide with particle sizes of various specifications to be satisfied, so the ceramic balls with the particle size having a wide range of 1-50mm to be produced; and 3, theprocess is simple, one-time investment is less, and production expansion is easy.

Description

technical field [0001] The invention relates to a ceramic ball and a preparation method thereof, in particular to a high-density silicon carbide ceramic ball and a preparation method thereof. Background technique [0002] Silicon carbide ceramics have high strength, low creep, friction and wear resistance, corrosion resistance and good oxidation resistance, and their excellent mechanical properties, low thermal expansion coefficient and high thermal conductivity determine the properties of silicon carbide ceramics. Thermal shock resistance is very good. Based on the above advantages, silicon carbide ceramic balls, as key components of grinding balls, ceramic bearings, and ball valves, have broad application prospects in harsh working conditions such as high temperature, strong acid, strong alkali, and impact resistance. [0003] The ball forming methods in the prior art of silicon carbide ceramic balls mainly include the following: [0004] (1) Extrusion method: The powde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 辛玲宋贺臣姜维海郝玉辉路书芬
Owner HENAN XINDAXIN SCI & TECH
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