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A method of burning and synthesizing silicon nitride powder

A silicon nitride powder, combustion synthesis technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as deterioration of environmental problems, unsafe health of workers, etc., to meet the requirements of reducing production equipment, The effect of shortening the production cycle and weak bonding force

Active Publication Date: 2021-12-07
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, "a method for preparing high-alpha-phase silicon nitride" invented by Merzhanov et al. (patent US5032370) and "a method for rapid preparation of high-alpha-phase silicon nitride powder by self-propagation and pollution-free" invented by Li Jinfu et al. The use of some additives that will produce harmful substances after reaction will not only further aggravate the environmental problems in the industrial production process, but also the health of the staff cannot be guaranteed

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  • A method of burning and synthesizing silicon nitride powder
  • A method of burning and synthesizing silicon nitride powder
  • A method of burning and synthesizing silicon nitride powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for combusting and synthesizing silicon nitride powder, the concrete steps are as follows:

[0041] (1) Take the following raw materials according to mass percentage: 38% silicon powder (purity > 99%), 54% silicon nitride powder diluent, 8% silica sol with a solid content of 20%;

[0042](2) Preparation of powder mixture: uniformly mix silicon powder, silicon nitride powder diluent and additive silica sol to obtain a reactant.

[0043] (3) Combustion reaction: Place the above-mentioned reactant in a mold, then put it into a combustion synthesis reaction kettle, fill it with 4MPa high-purity nitrogen, and then initiate the combustion synthesis reaction by partial ignition.

[0044] (4) Obtaining the product powder: after cooling down, release the gas in the reactor, take out the product silicon nitride, and obtain a loose product. It is detected that its α-phase content is 89%, and its morphology photo is obtained.

Embodiment 2

[0046] A method for combusting and synthesizing silicon nitride powder, the concrete steps are as follows:

[0047] (1) Take the following raw materials according to mass percentage: 44% silicon powder (purity > 99%), 44% silicon nitride powder diluent, 12% water;

[0048] (2) Preparation of powder mixture: uniformly mix silicon powder, silicon nitride powder diluent and water to obtain a reactant.

[0049] (3) Carrying out the combustion reaction: the above-mentioned reactants were placed in a mold, then put into a combustion synthesis reactor, filled with 1MPa high-purity nitrogen, and then the combustion synthesis reaction was initiated by local ignition.

[0050] (4) Obtaining the product powder: after cooling down, release the gas in the reactor, and take out the product silicon nitride. It is detected that its α-phase content is 93%, and its morphology photo is obtained.

Embodiment 3

[0052] A method for combusting and synthesizing silicon nitride powder, the concrete steps are as follows:

[0053] (1) Take the following raw materials according to mass percentage: 40% silicon powder (purity > 99%), 57% silicon nitride powder diluent, 3% silicon dioxide nano powder;

[0054] (2) Preparation of powder mixture: uniformly mix silicon powder, silicon nitride powder diluent and silicon dioxide nano powder to obtain a reactant.

[0055] (3) Combustion reaction: Place the above-mentioned reactant in a mold, then put it into a combustion synthesis reaction kettle, fill it with 4MPa high-purity nitrogen, and then initiate the combustion synthesis reaction by partial ignition.

[0056] (4) Obtaining the product powder: after cooling down, release the gas in the reactor, and take out the product silicon nitride. It is detected that the α-phase content is 90%, and its morphology photo is obtained.

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Abstract

The invention discloses a method for burning and synthesizing silicon nitride powder. The method uses silicon powder, silicon nitride powder diluent and additives as raw materials to prepare silicon nitride powder through combustion synthesis, wherein the additive is SiO-containing 2 One or more of substance, SiO and water. The method uses green additives and a relatively simple combustion synthesis process to prepare silicon nitride powder with an α-phase ≥ 80%. Avoid the negative effects of traditional additives, and finally obtain a green way to realize the synthesis of silicon nitride powder with α phase ≥ 80%.

Description

technical field [0001] The invention relates to the technical field of silicon nitride powder, in particular to a method for combusting and synthesizing silicon nitride powder. Background technique [0002] As a low-temperature stable phase of silicon nitride, α-silicon nitride is used as the main powder material of high-performance silicon nitride ceramics because it has better sintering performance than β-silicon nitride. High-quality powder raw materials endow silicon nitride ceramics with excellent mechanical properties, thermal properties, and corrosion resistance. Silicon nitride ceramic products show outstanding advantages in the application of various engineering industries. In addition, in the photovoltaic silicon industry, α-silicon nitride powder as a release agent for casting crucibles also has a huge demand in the market. It can be seen that the preparation technology of α-silicon nitride powder plays a pivotal role in the field of silicon nitride. Obtaining ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/068
CPCC01B21/0682C01P2002/72C01P2004/03C01P2006/80
Inventor 李江涛王良杨增朝贺刚杨潇李永双爽
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI