Preparation method of silicon nitride ceramic

A technology of silicon nitride ceramics and silicon nitride powder, which is applied in the field of engineering ceramic materials and can solve the problems of large damage to molds and green bodies, environmental pollution, etc.

Inactive Publication Date: 2014-10-01
SINOMA CHENGDU ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The injection temperature in the prior art is generally above 140 degrees, which will cause greater damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing silicon nitride ceramics, characterized in that it comprises the steps of:

[0025] a. Drying after mixing silicon nitride powder, silicon carbide powder, sintering aid, surfactant, water and organic solvent;

[0026] b. The mixture obtained in step a is added to a grinder, and pulverized to obtain a powdery mixture at last;

[0027] c. adding organic binder and water to the powdery mixture obtained in step b, stirring and mixing;

[0028] d. The mixture obtained by step C is filtered and screened;

[0029] e. Down injection molding the mixed material obtained in step d at 135-150° C., 15-18 Mpa, and a pH value between 7 and 9 to obtain a green body.

[0030] The preparation method of a silicon nitride ceramic is characterized in that, in the step a. 85~125 parts of silicon nitride powder or silicon carbide powder, 16~32 parts of sintering aid, 7~15 parts of surfactant 10-15 parts of water, mixed and dried in an organic solvent, wherein the s...

Embodiment 2

[0036] A method for preparing silicon nitride ceramics, characterized in that it comprises the steps of:

[0037] a. Drying after mixing silicon nitride powder, silicon carbide powder, sintering aid, surfactant, water and organic solvent;

[0038] b. The mixture obtained in step a is added to a grinder, and pulverized to obtain a powdery mixture at last;

[0039] c. adding organic binder and water to the powdery mixture obtained in step b, stirring and mixing;

[0040] d. The mixture obtained by step C is filtered and screened;

[0041] e. Down injection molding the mixed material obtained in step d at 135°C, 15Mpa, and pH value of 7 to obtain a green body.

[0042]The preparation method of a silicon nitride ceramic is characterized in that, in the step a. 85 parts of silicon nitride powder or silicon carbide powder, 16 parts of sintering aid, 7 parts of surfactant, 10 parts of water, Mixing and drying in an organic solvent, wherein the ratio of the sum of the parts by we...

Embodiment 3

[0047] A method for preparing silicon nitride ceramics, characterized in that it comprises the steps of:

[0048] a. Drying after mixing silicon nitride powder, silicon carbide powder, sintering aid, surfactant, water and organic solvent;

[0049] b. The mixture obtained in step a is added to a grinder, and pulverized to obtain a powdery mixture at last;

[0050] c. adding organic binder and water to the powdery mixture obtained in step b, stirring and mixing;

[0051] d. The mixture obtained by step C is filtered and screened;

[0052] e. The mixed material obtained in step d is injection molded at 150° C., 18 Mpa, and a pH value of 9 to obtain a green body.

[0053] The preparation method of a silicon nitride ceramic is characterized in that, in the step a, 125 parts of silicon nitride powder or silicon carbide powder, 32 parts of sintering aid, 15 parts of surface activity, and 15 parts of water are mixed in Mixing and drying in an organic solvent, wherein the ratio of...

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PUM

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Abstract

The invention belongs to the field of engineering ceramic materials, and relates to preparation of a ceramic, particularly a preparation method of a silicon nitride ceramic. The method is characterized by comprising the following steps: a. mixing silicon nitride powder, silicon carbide powder, a sintering assistant, a surfactant, water and an organic solvent, and drying; b. adding the mixture obtained in the step a into a grinding mill, and pulverizing to finally obtain a powder mixture; c. adding an organic binder and water into the powder mixture obtained in the step b, stirring and mixing; d. filtering the mixture obtained in the step c, and screening; and e. carrying out injection molding on the mixture obtained in the step d at 135-150 DEG C under the pressure of 15-18 Mpa under the condition of the pH value of 7-9, thereby obtaining the billet.

Description

technical field [0001] The invention belongs to the field of engineering ceramic materials, and relates to a preparation of ceramics, in particular to a preparation method of silicon nitride ceramics. Background technique [0002] Engineering ceramics, also known as silicon nitride ceramics or high-strength ceramics, are made of silicon powder as raw material, and are manufactured by reaction sintering and hot pressing. It has almost all the advantages of the modern ceramic family, generally has high strength, has excellent wear resistance and chemical corrosion resistance, and is also a good electrical insulating material. [0003] Ceramics used in engineering structures are called engineering ceramics, which are mainly used at high temperatures, also known as high-temperature structural ceramics. This type of ceramics has the advantages of high strength, high hardness, oxidation resistance, corrosion resistance, wear resistance, and ablation resistance at high temperature...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622
Inventor 付伟峰窦涛
Owner SINOMA CHENGDU ENERGY TECH
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