Tantalic oxide modified molybdenum disilicide based material and preparation method thereof
A technology of tantalum pentoxide and molybdenum disilicide, which is applied in the field of preparation of MoSi2-based composite materials and MoSi2-based composite materials, can solve the problems of not finding tantalum pentoxide-modified molybdenum disilicide-based composite materials, and achieve porosity Small, high-purity effects
Inactive Publication Date: 2009-10-28
HARBIN ENG UNIV
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Problems solved by technology
However, no relevant reports on molybdenum disilicide-based composite materials modified by tantalum pentoxide have been found.
Method used
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Embodiment
[0019] Embodiment: The hot-pressing sintering technology of the present invention is combined with ultrasonic wave and ball milling process, has obtained the Ta 2 o 5 doped MoSi 2 base composite material. 1%, 3%, 5%, 7% Ta by weight 2 o 5 and 93%-99% MoSi by weight 2 The powder was ultrasonically dispersed in a beaker filled with absolute ethanol for 30 minutes; the dispersed solution was put into a ball mill tank for ball milling for 4 hours, wherein the ball-to-material ratio was 20:1, and the speed was 450 rpm; the slurry after ball milling was The materials were freeze-dried, ground, and sieved, then put into graphite grinding tools, and sintered at 1400°C for 40 minutes to obtain Ta 2 o 5 / MoSi 2 Sintered body.
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The invention provides a molybdenum disilicide-based composite material modified by tantalum pentoxide and a preparation method thereof. According to the weight percentage of tantalum pentoxide 1%-7%, MoSi293%-99%, the raw materials are mixed evenly, and the dry powder is obtained after ultrasonic dispersion and ball milling, and the dry powder is placed in a vacuum hot-press sintering furnace In the process, sintering at 1400°C to obtain tantalum pentoxide-modified molybdenum disilicide-based composite materials. The Ta2O5 doped MoSi2 composite material prepared by the method of the present invention has the characteristics of high specific strength, high temperature resistance, corrosion resistance, high temperature oxidation resistance, and strong thermal shock resistance, and is a new type of high-performance high-temperature material with good electrical and thermal conductivity. Structural materials.
Description
1. Technical field [0001] What the present invention relates to is a kind of composite material, specifically a kind of MoSi 2 base composite material. The present invention also relates to a MoSi 2 Method for preparing composite materials. 2. Background technology [0002] Some structural components in modern aviation and aerospace systems require materials that can work safely and reliably at high temperatures, and have low structural weight, so as to increase the thrust-to-weight ratio as much as possible. New materials used at temperatures up to 1600°C must meet the requirements of high strength, creep resistance, good fracture toughness, oxidation resistance, and stable structural properties. Among the high-temperature structural materials currently being studied, engineering ceramics are difficult to put into high-temperature applications in the short term due to toughness and processing difficulties, poor thermal conductivity, and thermal stress during thermal cycl...
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IPC IPC(8): C04B35/58C04B35/622
Inventor 方双全张晓红乔英杰刘爱东
Owner HARBIN ENG UNIV