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Method for preparing silicon carbide ceramic impeller through gel casting and pressureless sintering

A technology of gel injection molding and silicon carbide ceramics is applied in the field of material preparation, which can solve the problems of complex and precise large-size pump impellers, etc., and achieve the effects of ensuring high strength, suppressing cracks, and eliminating cracks.

Active Publication Date: 2014-03-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to prepare a large-size pump impeller that meets the performance requirements and has a complex and precise shape is a difficult problem before us.

Method used

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  • Method for preparing silicon carbide ceramic impeller through gel casting and pressureless sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 9500g of silicon carbide powder, 200g of boron carbide powder, and 300g of carbon black powder into 25L of deionized water, add 100ml of glycerol as a dispersant, ball mill and mix for 24 hours, and spray dry to obtain a uniformly mixed powder for use;

[0030] Add 1905g of acrylamide, 95g of N,N-methylenebisacrylamide, and 200ml of tetramethylammonium hydroxide into 7.8L of deionized water, stir thoroughly mechanically, and prepare an organic compound solution for use;

[0031]Take 523ml of organic premixed solution, and gradually add 2000g of premixed ceramic powder while stirring mechanically, to prepare ceramic slurry;

[0032] Put the ceramic slurry in the vacuum box, vacuum defoaming for 20min;

[0033] Add 2.76g initiator APS and 0.28g catalyst TEMED to the ceramic slurry, and stir evenly;

[0034] Inject the ceramic slurry into a special ceramic impeller mold, solidify at room temperature, and demould to obtain a complex-shaped silicon carbide ceramic...

Embodiment 2

[0041] Add 9920g of silicon carbide powder, 30g of boron carbide powder, and 50g of carbon black powder into 25L of deionized water, add 100ml of glycerol as a dispersant, stir and grind the mixture for 8 hours, vacuum dry, crush, and sieve to 80 meshes to obtain The mixed powder that is mixed evenly is ready for use;

[0042] Add 1,200g of acrylamide, 100g of N,N-methylenebisacrylamide, and 500ml of tetramethylammonium hydroxide into 8,200L of deionized water, fully mechanically stir, and prepare an organic compound solution for use;

[0043] Take 760ml of organic premixed liquid, and gradually add 2000g of premixed ceramic powder while stirring mechanically, to prepare ceramic slurry;

[0044] Put the ceramic slurry in a vacuum box, and vacuum defoaming for 10 minutes;

[0045] Add 0.55g initiator APS and 1.38g catalyst TEMED to the ceramic slurry, and stir evenly;

[0046] Inject the ceramic slurry into a special ceramic impeller mold, ...

Embodiment 3

[0053] Add 9920g of silicon carbide powder, 30g of boron carbide powder, and 50g of carbon black powder into 25L of deionized water, add 100ml of glycerol as a dispersant, stir and grind the mixture for 8 hours, vacuum dry, crush, and sieve to 80 meshes to obtain The mixed powder that is mixed evenly is ready for use;

[0054] Add 1,200g of acrylamide, 100g of N,N-methylenebisacrylamide, and 500ml of tetramethylammonium hydroxide into 8,200L of deionized water, fully mechanically stir, and prepare an organic compound solution for use;

[0055] Take 760ml of organic premixed liquid, and gradually add 2000g of premixed ceramic powder while stirring mechanically, to prepare ceramic slurry;

[0056] Put the ceramic slurry in a vacuum box, and vacuum defoaming for 10 minutes;

[0057] Add 0.55g initiator APS and 1.38g catalyst TEMED to the ceramic slurry, and stir evenly;

[0058] Inject the ceramic slurry into a special ceramic impeller mold, solidify at room temperature, and de...

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Abstract

The invention discloses a method for preparing a silicon carbide ceramic impeller through gel casting and pressureless sintering, and provides a preparation method of a pressureless sintered silicon carbide ceramic impeller with a complex and accurate shape characteristic and an external diameter size capable of reaching over 160 mm. A silicon carbide solid-phase sintering formula system of a boron-containing sintering auxiliary agent and a gel casting and pressureless sintering process are adopted; and the method comprises eight steps of: preparing ceramic slurry; performing injection molding; demolding; drying; machining; degumming; performing pressureless sintering; and machining. According to the method, the technical problems of non-uniform mixing of large-scale ceramic slurry in gel casting, dryness, crack and deformation in a pressureless sintering process and the like are solved, and finally, preparation of the pressureless sintered silicon carbide ceramic impeller is realized. The impeller has good performance such as corrosion resistance, wear resistance, high temperature resistance and the like, and can be widely applied to a centrifugal pump for corrosive liquid conveying of various industries.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing a pressureless sintered silicon carbide ceramic impeller with complex and precise shape features and an outer diameter of up to 160 mm. Background technique [0002] Pressureless sintered silicon carbide is a good structural ceramic, which has the characteristics of high hardness, high thermal conductivity, high thermal shock performance, wear resistance, and good chemical corrosion resistance. It is a very ideal corrosion-resistant and wear-resistant Damage, high temperature resistant centrifugal pump impeller manufacturing materials. Reaction sintered silicon carbide products contain about 20vol% free silicon, and the sintering temperature is low, so the mechanical strength, corrosion resistance and wear resistance of reaction sintered silicon carbide materials are far lower than those of pressureless sintered silicon carbide. products. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/624C04B35/64
Inventor 燕青芝李县辉葛昌纯
Owner UNIV OF SCI & TECH BEIJING
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