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A kind of preparation method of high-purity, low-cost molybdenum disilicide

A molybdenum disilicide, low-cost technology, used in metal silicide, chemical industry, sustainable manufacturing/processing, etc., can solve the problems of low purity, unable to reach high-purity standards, affecting product purity, etc., and achieve high product purity. , low cost, reasonable and controllable process

Active Publication Date: 2022-05-20
辽宁中色新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purity of molybdenum disilicide is generally not high. Therefore, a large amount of impurities are introduced in the raw material stage, which affects the purity of the product and cannot reach the high-purity standard.

Method used

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  • A kind of preparation method of high-purity, low-cost molybdenum disilicide
  • A kind of preparation method of high-purity, low-cost molybdenum disilicide
  • A kind of preparation method of high-purity, low-cost molybdenum disilicide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) The raw material molybdenum trioxide 41.34 kg, silica 34.51 kg and high-purity graphite powder 24.15 kg, added carboxymethyl cellulose 1 kg, mixed in a 250 liter V-type mixer, the molybdenum trioxide purity of 99.5%, particle size of 325 mesh, silica purity of 99.8%, particle size of 400 mesh, high-purity graphite purity of 99.99%, particle size of 325 mesh, mixing 6.5 hours, to obtain the mixed material;

[0028] (2) The mixed material obtained in step (1) is pressed according to 1 kg per part, and the pressing pressure is 30MPa, and the pressing pressure is 30MPa, and the compaction is not loose, and the pressing density is ≥ 3.2g / cm 3 , to obtain the pressed block material;

[0029] (3) The pressed block material is vacuum sintered with 500 kg vacuum pressureless sintering furnace, and the whole vacuum sintering process is continuously vacuumed, and the amount of each charging is 200 kg;

[0030] (1) The first heating up

[0031] Turn on the power supply, send the po...

Embodiment 2

[0038] (1) The raw material molybdenum trioxide 41.34 kg, silica 34.51 kg and high-purity graphite powder 24.15 kg, add carboxymethyl cellulose 1 kg, mixed in a 250 liter V-type mixer, the molybdenum trioxide purity of 99.5%, particle size of 325 mesh, silica purity of 99.8%, particle size of 400 mesh, high purity graphite purity of 99.99%, particle size of 325 mesh, mixing 7.5 hours, to obtain the mixed material;

[0039] (2) The mixed material obtained in step (1) is pressed according to 1 kg per part, and the pressing pressure is 30MPa, and the pressing pressure is 30MPa, and the compaction is not loose, and the pressing density is ≥ 3.2g / cm 3 , to obtain the pressed block material;

[0040] (3) The pressed block material is vacuum sintered with 500 kg vacuum pressureless sintering furnace, and the whole vacuum sintering process is continuously vacuumed, and the amount of each charging is 200 kg;

[0041] (1) The first heating up

[0042]Turn on the power supply, send electrici...

Embodiment 3

[0048] (1) The raw material molybdenum trioxide 41.34 kg, silica 34.51 kg and high-purity graphite powder 24.15 kg, added carboxymethyl cellulose 1 kg, mixed in a 250 liter V-type mixer, the molybdenum trioxide purity of 99.5%, particle size of 325 mesh, silica purity of 99.8%, particle size of 400 mesh, high purity graphite purity of 99.99%, particle size of 325 mesh, mixing for 7 hours, to obtain the mixed material;

[0049] (2) The mixed material obtained in step (1) is pressed according to 1 kg per part, and the pressing pressure is 30MPa, and the pressing pressure is 30MPa, and the compaction is not loose, and the pressing density is ≥ 3.2g / cm 3 , to obtain the pressed block material;

[0050] (3) The pressed block material is vacuum sintered with 500 kg vacuum pressureless sintering furnace, and the whole vacuum sintering process is continuously vacuumed, and the amount of each charging is 200 kg;

[0051] (1) The first heating up

[0052]Turn on the power supply, send the p...

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Abstract

A method for preparing high-purity, low-cost molybdenum disilicide. The raw materials molybdenum trioxide, silicon dioxide and high-purity graphite powder are added to an industrial dry powder forming agent, mixed in a mixer, and put in 1 kg per part Squeeze with a hydraulic press to obtain pressed blocks; vacuum sinter the pressed blocks in a 500 kg vacuum pressureless sintering furnace, power on and vacuum to 3Pa, sinter at 350°C for 1-2 hours, keep warm at 1620°C, and the vacuum in the furnace is 20Pa- Continue to heat up between 25Pa; keep warm at 1850°C for 10-15 hours, cool down, the temperature drops to 1250°C, pump the vacuum to 3Pa-4Pa, keep warm for 5 hours, silicon and molybdenum are fully combined, power off and cool down, and molybdenum disilicide is obtained. Using molybdenum oxide as a raw material, the raw material cost is low, and the whole process is reasonable and controllable, and single-phase high-purity molybdenum disilicide can be prepared, which is suitable for industrial production.

Description

Technical field [0001] The present invention relates to a method for preparing molybdenum disilicide, particularly to a high-purity, low-cost molybdenum disilicide preparation method. Background [0002] Molybdenum disilicide is a refractory metal silicide, the radius of Mo and Si atoms is not much different, so Mo and Si atoms are combined with the ratio of atomic numbers 1:2 to form MoSi 2 It has the characteristics of coexistence of metal parts and covalent bonds, so MoSi 2 It has the dual properties of metal and ceramic, its melting point is high, the density is low and it has excellent high temperature oxidation resistance, and is widely used in high temperature components, nozzles, high temperature filters and spark plugs of aviation and automotive gas turbines. [0003] At present, the industrial production of molybdenum disilicide powder is the molybdenum powder and silicon powder mixed, alloying reaction at a temperature of about 1300 ° C, molybdenum powder cost is high,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/06
CPCC01B33/06C01P2002/72C01P2004/01Y02P20/10
Inventor 张洪涛
Owner 辽宁中色新材科技有限公司
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