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Speed preparing composite material powder with MoSi2 base and its method of sintered body

A composite material and sintered body technology, which is applied in the field of rapid preparation of MoSi2-based composite material powder and its sintered body, can solve problems such as complex processes, achieve the effects of simplifying processes, saving energy and costs, and improving production efficiency

Inactive Publication Date: 2005-01-05
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process used is still relatively complicated, and the material must be densified by secondary hot pressing, etc.

Method used

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  • Speed preparing composite material powder with MoSi2 base and its method of sintered body
  • Speed preparing composite material powder with MoSi2 base and its method of sintered body
  • Speed preparing composite material powder with MoSi2 base and its method of sintered body

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: adopt a kind of rapid preparation MoSi of the present invention 2 Based on the method of composite material powder and its sintered body, a La with a density of 96.6% is obtained 2 o 3 / MoSi 2 The properties of composite materials are shown in Table 1. Raw material ratio is Mo: 2Si (molar ratio) + 0.8% La 2 o 3 (weight ratio), fully mixed evenly, the powder passed through a 300-mesh sieve, mixed on a mixer for 5 hours, after fully mixed evenly, placed in a high-temperature self-propagating reactor, vacuumed, and ignited with a tungsten wire, its output voltage ≤ 50 volts and a current of 12 amperes, complete the high-temperature self-propagating reaction within 5 seconds; put the powder prepared by the high-temperature self-propagating reaction into a ball mill jar, adopt a ball-to-material ratio of 10:1, rotate at 200 rpm, and ball mill for 2 hours; The ball-milled powder passes through a 300-mesh sieve, and is pressed on a hydraulic press with a pre...

Embodiment 2

[0025] Embodiment 2: Adopt a kind of rapid preparation MoSi of the present invention 2 Based on the method of composite material powder and its sintered body, a La with a density of 97.6% is obtained 2 o 3 -WSi 2 / MoSi 2 The properties of composite materials are shown in Table 2. Raw material ratio is Mo: 2Si (molar ratio) + 0.1% La 2 o 3 (weight ratio) + 25% (mole fraction) tungsten powder, fully mixed evenly, the powder passed through a 300 mesh sieve, mixed on the mixer for 24 hours, after fully mixed evenly, placed in a high-temperature self-propagating reactor, vacuumized, Use tungsten wire to ignite, the output voltage is ≤50 volts, the current is 20 amperes, and the high-temperature self-propagating reaction is completed within 15 seconds; the powder prepared by the high-temperature self-propagating reaction is put into a ball mill tank, and the ball-to-material ratio is 10:1. Rotate at 200rpm, ball mill for 2 hours; then pass the ball milled powder through a 300-...

Embodiment 3

[0031] Embodiment 3: adopt a kind of rapid preparation MoSi of the present invention 2 Based on the method of composite material powder and its sintered body, a La with a density of 96.4% is obtained 2 o 3 -Al / MoSi 2 The properties of composite materials are listed in Table 3. Raw material ratio is Mo: 2Si (molar ratio) + 1.0% La 2 o 3 (weight ratio) + 8.5% (mole fraction) aluminum powder, fully mixed evenly, the powder all passed through a 300 mesh sieve, mixed on a mixer for 10 hours, after fully mixed evenly, placed in a high-temperature self-propagating reactor, vacuumized, Use tungsten wire to ignite, the output voltage is ≤50 volts, the current is 15 amperes, and the high-temperature self-propagating reaction is completed within 10 seconds; the powder prepared by the high-temperature self-propagating reaction is put into a ball mill tank, and the ball-to-material ratio is 10:1. Rotate at 200rpm, ball mill for 2 hours; then pass the ball-milled powder through a 300-m...

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Abstract

The invention is a method of rapidly preparing MoSi2 based composite powder and its sintered body, mainly adopting self-propagating high-temperature synthesis (SHS) to combine with ball-milling process, simultaneously adding in rare-earth elements, and rapidly completing sintering at 1400-1600 deg.C; because it adopts a project of SHS to rapidly prepare MoSi2 based composite combining with ball-milling particle-fining process, and simultaneously introducing rare-earth elements, overcoming the difficult problems of obtaining high-density MoSi2 at above 1700 deg.C only by singly adopting SHS and long time of synthesizing MoSi2 by MA (mechanical alloying) process; as compared with hot press process and hot isostatic pressing (HIP) process, it has the advantages of simplifying process, saving energy, increasing production efficiency and easy for industrial production; obviously acclerates the sinter-densifying course, obtains sintered body with compactibility up to 96%, and reduces sintering temperature by 200 deg.C.

Description

technical field [0001] The invention relates to a method for preparing MoSi 2 (Molybdenum disilicide)-based composite material powder and a method for its sintered body, in particular to a method for rapidly preparing MoSi 2 A method for matrix composite powder and its sintered body. Background technique [0002] From the 1950s to the end of the 1970s, metal-based superalloys (such as Ni-based and Co-based superalloys) have been well applied in the range below 1000 ° C, but due to the limitation of the melting point of the metal matrix, It is becoming more and more difficult to continue to increase the service temperature of superalloys. Ni developed successively 3 Al and Ti 3 Al and other aluminides have good room temperature plasticity and light weight, but their oxidation resistance is poor above 650 °C, and a protective coating needs to be applied. TiAl also exhibits poor oxidation resistance at temperatures higher than 800 °C; Al 3 Ti has the disadvantages of lower...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/18
Inventor 张厚安陈平龙春光刘心宇唐果宁李颂文
Owner HUNAN UNIV OF SCI & TECH
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