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Preparation method of silicon nitride-based conductive ceramic and molding method of silicon nitride-based conductive ceramic cutting tool

A conductive ceramic, silicon nitride-based technology, applied in the field of ceramic preparation, can solve the problems of high brittleness, poor electrical properties of silicon nitride ceramics, difficult processing, etc., to improve toughness and strength, reduce tool processing costs, and relax sintering process. The effect of the restriction

Inactive Publication Date: 2015-05-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problems that the existing silicon nitride ceramics have poor electrical properties, high brittleness, and difficulty in processing, and there are defects and insufficiencies in the forming and processing methods of the existing silicon nitride ceramic tools, and provides a method with both good mechanical properties and good electrical properties. The preparation method of silicon nitride ceramics with high performance, and the forming method of using this kind of silicon nitride ceramics to make cutting tools
Ceramic tools made of this silicon nitride ceramic are suitable for PVD coating process

Method used

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  • Preparation method of silicon nitride-based conductive ceramic and molding method of silicon nitride-based conductive ceramic cutting tool
  • Preparation method of silicon nitride-based conductive ceramic and molding method of silicon nitride-based conductive ceramic cutting tool
  • Preparation method of silicon nitride-based conductive ceramic and molding method of silicon nitride-based conductive ceramic cutting tool

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Experimental program
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Effect test

Embodiment 1-23

[0027] The preparation method of silicon nitride-based conductive ceramics is as follows:

[0028] (1) Ingredients: Take Si as the volume percentage shown in Table 1 below 3 N 4 Powder, conductive phase, binder and sintering aids, and then the selected components are mixed together to obtain mixed raw materials.

[0029] (2) Mixing: Mix the mixed raw materials with absolute ethanol, the volume percentage of the solid phase is 35%; after mixing, place the mixture in a planetary ball mill for high speed (400r / min) ball milling for 20 hours, and then ultrasonically disperse the mixture for 4 minutes; Get mixed slurry. Then, the mixed slurry is placed at 60°C by rotary evaporation to remove most of the absolute ethanol, and then the mixed slurry is dried at 80°C and passed through a 100-mesh sieve to obtain a mixed powder.

[0030] (3) High temperature sintering

[0031] High-temperature sintering method one (Example 1-19, Example 22-23): Place the mixed powder in the mold at 1atm of N 2...

Embodiment 24

[0046] The preparation methods of silicon nitride-based conductive ceramics and silicon nitride-based conductive ceramic tools are as follows:

[0047] (1) Ingredients: respectively take 67% vol Si according to volume percentage 3 N 4 Powder, 30%vol TiC 0.5 N 0.5 , 3%volMgO-Y 2 O 3 , And then mix the three components together to get mixed raw materials.

[0048] (2) Mixing: mix the mixed raw materials with anhydrous ethanol, the volume percentage of the solid phase is 35%; after mixing, place the mixture in a planetary ball mill for high speed (400r / min) ball milling for 20 hours, and then perform 3min ultrasound on the mixture Disperse; get mixed slurry. Next, the mixed slurry is placed at 60° C. to remove most of the absolute ethanol by rotary evaporation, and then the mixed slurry is dried at 80° C. and passed through a 100-mesh sieve to obtain a mixed powder.

[0049] (3) High-temperature sintering: place the mixed powder in the mold, at 1atm of N 2 Under the atmosphere, hot pre...

Embodiment 25

[0055] The preparation methods of silicon nitride-based conductive ceramics and silicon nitride-based conductive ceramic tools are as follows:

[0056] (1) Ingredients: take 67.5% vol Si by volume percentage 3 N 4 Powder, 27.5%vol TiC 0.5 N 0.5 , 5%volMgO-Y 2 O 3 , And then mix the three components together to get mixed raw materials.

[0057] (2) Mixing: Mix the mixed raw materials with absolute ethanol, the volume percentage of the solid phase is 35%; after mixing, place the mixture in a planetary ball mill for high speed (400r / min) ball milling for 20 hours, and then conduct the mixture for 4.5 minutes Ultrasonic dispersion; get mixed slurry. Next, the mixed slurry is placed at 60° C. to remove most of the absolute ethanol by rotary evaporation, and then the mixed slurry is dried at 80° C. and passed through a 100-mesh sieve to obtain a mixed powder.

[0058] (3) High-temperature sintering: place the mixed powder in the mold, at 1atm of N 2 In the atmosphere, the two-step heat pr...

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Abstract

The invention relates to the technical field of ceramic preparation, and in particular relates to a preparation method of silicon nitride-based conductive ceramic and a molding method of a silicon nitride-based conductive ceramic cutting tool. A microstructure of the silicon nitride-based conductive ceramic can be effectively optimized by adding a certain amount of a sintering aid prepared from MO and a rare earth oxide, so that the toughness and the strength of the silicon nitride-based conductive ceramic are significantly improved; improvement of the electric conductivity of the silicon nitride-based conductive ceramic is facilitated by adding a certain amount of conductive phase; the silicon nitride-based conductive ceramic can be processed by an electric spark machining technique; the ceramic cutting tool prepared from the silicon nitride-based conductive ceramic is suitable for a PVD coating technology; in addition, the ceramic cutting tool also plays toughening and strengthening roles; the improvement of the overall performance of the silicon nitride-based conductive ceramic is facilitated by adding a certain amount of a metal phase binder; the cutting tool is fabricated from the silicon nitride-based conductive ceramic through the molding method; the cutting tool with a complicated shape can be prepared; and the silicon nitride-based conductive ceramic cutting tool with relatively excellent performance can be obtained.

Description

Technical field [0001] The invention relates to the technical field of ceramic preparation, in particular to a method for preparing silicon nitride-based conductive ceramics and a method for forming silicon nitride-based conductive ceramic tools. Background technique [0002] As a non-oxide insulating engineering ceramic, silicon nitride ceramic has excellent properties such as wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, thermal shock resistance and low specific gravity. In the early 1980s, the general company first introduced silicon nitride ceramics Trial in the field of cutting tools, its appearance has made the tool materials have an amazing improvement in high temperature resistance and hardness, making it easy to process many workpiece materials with extremely high processing temperatures and costing tools, which is a great deal in the processing field. Breakthrough. At present, silicon nitride-based ceramic tools mainly includ...

Claims

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Application Information

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IPC IPC(8): C04B35/596C04B35/622
Inventor 伍尚华古尚贤郭伟明曾俊杰李安琼蒋强国高棱周茂鹏
Owner GUANGDONG UNIV OF TECH
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