A kind of polymetallic silicide powder and preparation method thereof

A technology of metal silicide and silicide, which is applied in the direction of metal silicide, can solve the problems of long nitriding heat treatment time, etc., and achieve the effect of adjustable hardness and uniform particles

Active Publication Date: 2017-12-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicide introduction method adopts in-situ generation of oxide or carbide and silicon powder, which not only introduces impurities such as oxygen and carbon, but also takes a long time for nitriding heat treatment.

Method used

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  • A kind of polymetallic silicide powder and preparation method thereof
  • A kind of polymetallic silicide powder and preparation method thereof
  • A kind of polymetallic silicide powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1:

[0042] Synthesized m by two heat treatments WSi2 :m FeSi2 = 1:1 WSi 2 / FeSi 2 Adjacent or wrapped structure powder

[0043] 1) Mixing for the first time: Mix 100g of tungsten powder and silicon powder according to the atomic ratio of 1:2, add silicon nitride balls or alumina balls, add 45g of absolute ethanol and mix, and ball mill for 1.5h;

[0044] 2) Drying and sieving: blow dry at 40°C for 3 hours, and pass through a 60-mesh sieve;

[0045] 3) The first heat treatment: heat treatment at 1450°C for 3 hours in an argon protective atmosphere;

[0046] 4) The second mixing: add 100g of iron powder and silicon powder with an atomic ratio of 1:2 to the powder obtained by heat treatment, 100g of silicon nitride balls or alumina balls, and 120g of absolute ethanol, mix and ball mill for 2 hours;

[0047] 5) Drying and sieving: air-dry at 40°C for 5 hours, and pass through a 60-mesh sieve;

[0048] 6) The second heat treatment: heat treatment at 1250°C fo...

Embodiment 2

[0051] Synthesized m by two heat treatments MoSi2 :m FeSi2 = 1:2 MoSi 2 / FeSi 2 Adjacent or wrapped structure powder

[0052] 1) Mixing for the first time: Mix 60g of molybdenum powder and silicon powder according to the atomic ratio of 1:2, add silicon nitride balls or alumina balls, add 45g of absolute ethanol and mix, and ball mill for 1.5h;

[0053] 2) Drying and sieving: blow dry at 40°C for 3 hours, and pass through a 60-mesh sieve;

[0054] 3) The first heat treatment: heat treatment at 1300°C for 5 hours in an argon protective atmosphere;

[0055] 4) The second mixing: add 120g of iron powder and silicon powder with an atomic ratio of 1:2 to the heat-treated powder, mix with 100g of silicon nitride balls or alumina balls, and 120g of absolute ethanol, and ball mill for 2 hours;

[0056] 5) Drying and sieving: air-dry at 40°C for 5 hours, and pass through a 60-mesh sieve;

[0057] 6) The second heat treatment: heat treatment at 1200° C. for 5 hours in an argon pro...

Embodiment 3

[0059] Synthesized m by two heat treatments Mo5Si3 :m Cr3Si = Mo of 3:1 5 Si 3 / Cr 3 Si adjacent or wrapped structure powder

[0060] 1) Mixing for the first time: mix 150g of molybdenum powder and silicon powder according to the atomic ratio of 5:3, add 60g of absolute ethanol to 80g of silicon nitride balls or alumina balls, mix, and ball mill for 1.5h;

[0061] 2) Drying and sieving: blow dry at 40°C for 3 hours, and pass through a 60-mesh sieve;

[0062] 3) The first heat treatment: heat treatment at 1800°C for 0.5h in an argon protective atmosphere;

[0063] 4) Second mixing: Add 50g of chromium powder and silicon powder with an atomic ratio of 3:1, 100g of silicon nitride balls or alumina balls, and 120g of absolute ethanol to the powder obtained by heat treatment, and ball mill for 2 hours;

[0064] 5) Drying and sieving: air-dry at 40°C for 5 hours, and pass through a 60-mesh sieve;

[0065] 6) The second heat treatment: heat treatment at 1400° C. for 0.5 h in a...

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Abstract

The invention relates to multi-metal silicide powder and a preparing method thereof. The preparing method comprises: uniformly mixing, drying and sieving first metal with silicon powder of a corresponding ratio, and performing first thermal treatment at first temperature under the protection of an inertia gas to obtain first metal silicide powder; uniformly mixing, drying and sieving second metal with silicon powder of a corresponding ratio and the first metal silicide powder, and performing second thermal treatment at second temperature under the protection of the inertia gas to obtain multi-metal silicide powder containing the first metal silicide and second metal silicide, wherein a melting point of the first metal silicide is larger than that of the second metal silicide, and the first temperature is higher than the second temperature. Multiple silicide particles are synthesized by a manner of thermal treatment step by step, and forming components and ratios of the silicide particles can be controlled. The obtained multiple silicides are bound together in a solid solution or mutual wrapping manner, and can be directly introduced into a sintering process, a welding process and other processes for use.

Description

technical field [0001] The invention relates to a kind of solid-solution or wrapping powder of various silicides to form a uniform particle powder and a preparation method thereof. The powder has a uniform structure and no elemental metal or silicon particles remain. The average particle size of the particles is 0.1-30 μm. The proportion of silicide components can be adjusted by design. It can be used directly as an additive in ceramic sintering, as a solder or auxiliary agent in welding, etc. field. Background technique [0002] Silicide can be directly used as a sintering additive for ceramics such as silicon nitride, silicon carbide, and alumina, which can improve the densification of ceramics, improve the appearance of ceramics, and improve the performance of ceramics. It can also be used as solder or additives in welding. [0003] A single silicide is often limited in thermal or mechanical properties such as thermal expansion coefficient and elastic modulus, which cann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/65C04B35/626C04B35/628C01B33/06
CPCC01B33/06C01P2002/72C01P2002/85C01P2004/03C01P2004/61C01P2004/82C01P2004/84C04B35/58085C04B35/626C04B35/62828C04B35/65C04B2235/95
Inventor 刘学建王鲁杰杨晓姚秀敏齐倩闫永杰黄政仁
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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