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Molybdenum-tungsten acid scandium composite material and preparation method thereof

A composite material, scandium tungstate technology, applied in the field of composite materials, can solve problems such as easy expansion and poor strength, achieve the effects of excellent performance, improve high temperature strength, and avoid separation

Active Publication Date: 2014-07-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a molybdenum-scandium tungstate composite material and its preparation method in order to solve the technical problems of easy expansion and poor strength of the existing scandium tungstate metal matrix composite material in a high temperature environment

Method used

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  • Molybdenum-tungsten acid scandium composite material and preparation method thereof

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specific Embodiment approach 1

[0014] Embodiment 1: In this embodiment, the molybdenum-scandium tungstate composite material is made of 35% to 75% scandium tungstate, 1% to 10% iron and 20% to 60% molybdenum in terms of mass percentage; the tungsten The mass purity of scandium acid is not less than 98%, and the mass purity of iron is not less than 99%.

specific Embodiment approach 2

[0015] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the molybdenum-scandium tungstate composite material consists of 40% to 70% scandium tungstate, 3% to 7% iron and 25% to 55% Made of molybdenum. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the molybdenum-scandium tungstate composite material is made of 60% scandium tungstate, 5% iron and 35% molybdenum by mass percentage. Others are the same as those in the first or second embodiment.

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Abstract

The invention belongs to the technical field of composite material preparation, and particularly relates to a molybdenum-tungsten acid scandium composite material and a preparation method thereof. The molybdenum-tungsten acid scandium composite material is made of tungsten acid scandium, iron and molybdenum. The preparation method includes 1, weighing raw materials; 2, dispersing the raw materials in step 1 in a dispersant, drying under a vacuum condition, and ball-milling slurry after drying to break the slurry by grinding to obtain mixed powder; 3, sintering the mixed powder to obtain the molybdenum-tungsten acid scandium composite material. The molybdenum-tungsten acid scandium composite material prepared by the method is 300-400MPa in tensile strength at room temperature, 120-160MPa in tensile strength at 600 DEG C, -1x10-6K-1-0.3x10-6K-1 in thermal expansion coefficient at 25-600 DEG C, and smaller than or equal to 100GPa in modulus of elasticity.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a composite material and a preparation method thereof. Background technique [0002] The material "expands with heat and contracts with cold" due to the anharmonic vibration effect of the lattice thermal vibration. But some materials are contrary to this. They shrink when heated and expand when cooled, that is, they have a "Negative Thermal Expansion" (Negative Thermal Expansion, NTE for short) effect. We call such materials negative thermal expansion materials or thermally shrinkable materials. Scandium tungstate exhibits negative thermal expansion behavior below 1200°C. [0003] The technical importance of scandium tungstate mainly reflects that the high negative expansion properties make it possible to control the expansion coefficient of high expansion materials without destroying the excellent properties of high expansion materials; it provides a rar...

Claims

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Application Information

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IPC IPC(8): B22F3/14B22F1/00
Inventor 韩文波张幸红王鹏赵广东张兆停程业红周长灵
Owner HARBIN INST OF TECH
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