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Silicon nitride material and its preparation method

A technology of silicon nitride and silicon nitride powder, applied in the field of silicon nitride materials, can solve the problems that the comprehensive properties of the materials fail to reach the silicon nitride materials, and the properties of the sintering aid materials are limited.

Active Publication Date: 2017-10-17
HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the basic content of the silicon nitride material produced by the existing technology is about 90%. Because of the limited performance of other modified or burning materials added, the comprehensive performance of the material fails to reach the ideal level of the silicon nitride material.

Method used

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  • Silicon nitride material and its preparation method
  • Silicon nitride material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] In one embodiment of the present invention, the preparation method of the silicon nitride material provided by the present invention comprises the following steps:

[0029] 1) will Li 2 O, Al 2 o 3 , Y 2 o 3 , MgO and SiO 2 Mix the powder evenly, and then press it into a disc with a thickness of 5mm; heat the disc to 800°C in air at a heating rate of 5°C / min, and keep it warm for 3.5h; then continue heating to 1100°C at a heating rate of 8°C / min ℃, keep warm for 3h to get 3LiYO 2 2LiAlSiO 4 ·Composite compound of 0.2MgO.

[0030] 2) Mix silicon powder (purity>99.99%), graphite powder (purity>99.9%), yttrium aluminum silicon lithium magnesium compound and silicon nitride powder (α phase>93%) obtained through step 1) to obtain Mix powder. Further, in the mixed powder, the mass percentages of the silicon powder, graphite powder, yttrium aluminum silicon lithium magnesium compound and silicon nitride powder are 2.2%, 2.5%, 3% and 92.3% respectively.

[0031] 3) Ad...

Embodiment 2

[0035] In another embodiment of the present invention, the preparation method of the silicon nitride material provided by the present invention comprises the following steps:

[0036] 1) will Li 2 O, Al 2 o 3 , Y 2 o 3 , MgO and SiO 2 Mix the powder evenly, and then press it into a disc with a thickness of 4.5 mm; heat the disc to 830 °C in air at a heating rate of 3.5 °C / min, and keep it for 2 hours; then continue heating to 970 °C at a heating rate of 6.5 °C / min ℃, keep warm for 4h to get 3LiYO 2 2LiAlSiO 4 · 0.3MgO composite compound.

[0037] 2) Mix silicon powder (purity>99.99%), graphite powder (purity>99.9%), yttrium aluminum silicon lithium magnesium compound and silicon nitride powder (α phase>93%) obtained through step 1) to obtain Mix powder. Further, in the mixed powder, the mass percentages of the silicon powder, graphite powder, yttrium aluminum silicon lithium magnesium compound and silicon nitride powder are 3%, 1.5%, 2.6% and 92.9% respectively.

[0...

Embodiment 3

[0042] In yet another embodiment of the present invention, the preparation method of the silicon nitride material provided by the present invention comprises the following steps:

[0043] 1) will Li 2 O, Al 2 o 3 , Y 2 o 3 , MgO and SiO 2 Mix the powder evenly, and then press it into a 3mm-thick disc; heat the disc to 840°C in air at a heating rate of 10°C / min, and keep it warm for 3.5h; then continue heating to 960°C at a heating rate of 3°C / min ℃, keep warm for 4h to get 3LiYO 22LiAlSiO 4 · Composite compound of 0.5MgO.

[0044] 2) Mix silicon powder (purity>99.99%), graphite powder (purity>99.9%), yttrium aluminum silicon lithium magnesium compound and silicon nitride powder (α phase>93%) obtained through step 1) to obtain Mix powder. Further, in the mixed powder, the mass percentages of the silicon powder, graphite powder, yttrium aluminum silicon lithium magnesium compound and silicon nitride powder are 1.4%, 2.6%, 4% and 92% respectively.

[0045] 3) Add polyvi...

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Abstract

The invention discloses a silicon nitride material and a preparation method thereof. The method comprises the following steps: silica fume, graphite, a compound of yttrium, aluminium, silicon, lithium and magnesium, and silicon nitride powder; an aqueous solution of polyvinyl alcohol, an aqueous solution of ammonium acrylate and water are added into the mixed powder, and a slurry is prepared; ball milling and granulation are carried out for the slurry, and a green body is moulded; the green body is dried and placed into a microwave atmosphere sintering furnace for sintering, and the silicon nitride material is obtained after sintering. The silicon nitride material prepared by the method has high purity; because high-quality silicon nitride whiskers are contained in the material, the performance of the material is more superior to the ideal performance of silicon nitride, and application effects and application fields are improved.

Description

technical field [0001] The invention relates to the technical field of silicon nitride materials, in particular to a silicon nitride whisker-enhanced high-purity silicon nitride material and a preparation method thereof. Background technique [0002] With the development of society and the advancement of science and technology, silicon nitride materials are increasingly valued and widely used in public life and industrial production, such as heating plates in instant water heaters, risers in metal casting, protection tubes and other products , the use of silicon nitride materials has shown great advantages. However, the basic content of the silicon nitride material produced by the prior art is about 90%. Because of the limited performance of other modified or sintering materials added, the comprehensive performance of the material fails to reach the ideal level of the silicon nitride material. Contents of the invention [0003] In view of this, the object of the present i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/81C04B35/626C04B35/65
CPCC04B35/584C04B35/626C04B35/65C04B2235/3225C04B2235/3203C04B2235/3206C04B2235/425C04B2235/428C04B2235/3472C04B2235/46C04B2235/658C04B2235/667C04B2235/96
Inventor 曾小锋李勇全
Owner HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD