Oxide ceramic/alkali-earth metal sulphate/silver composite material and preparation method thereof

A technology of oxide ceramics and alkaline earth metals, which is applied in the field of oxide ceramic matrix composite materials and their preparation, can solve the problems of high sintering temperature and poor friction and wear performance in the preparation process, and achieves low friction, good friction and wear performance, and tight bonding. Effect

Inactive Publication Date: 2010-05-05
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor friction and wear performance of existing oxide ceramic-based ceramic materials at a wide range of temperatures from room temperature to 760°C, and the high sintering temperature of the existing preparation process. The present invention provides an oxide ceramic / Alkaline earth metal sulfate / silver composite material and preparation method thereof

Method used

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  • Oxide ceramic/alkali-earth metal sulphate/silver composite material and preparation method thereof
  • Oxide ceramic/alkali-earth metal sulphate/silver composite material and preparation method thereof
  • Oxide ceramic/alkali-earth metal sulphate/silver composite material and preparation method thereof

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specific Embodiment approach 1

[0011] Specific embodiment one: In this embodiment, a kind of oxide ceramics / alkaline earth metal sulfate / silver composite material is composed of 20%~50% oxide ceramic phase, 30%~60% alkaline earth metal sulfate phase and 5%~50% by volume percentage. 25% silver phase composition.

[0012] In this embodiment, the oxide ceramic / alkaline earth metal sulfate / silver composite material has a friction coefficient of 0.05-0.15 at room temperature, and a friction coefficient of 0.18-0.25 at a high temperature of 760°C, both of which are lower than the friction of existing oxide ceramic ceramic materials. coefficient, especially at high temperatures, the reduction of friction coefficient is more obvious; the wear rate of oxide ceramics / alkaline earth metal sulfate / silver composites is less than 10 at room temperature and at a high temperature of 760 °C -6 mm 3 / N·m order of magnitude. In this embodiment, the oxide ceramic / alkaline earth metal sulfate / silver composite material also ex...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the oxide ceramics / alkaline earth metal sulfate / silver composite material is composed of 30% to 40% oxide ceramic phase and 40% to 50% alkaline earth metal sulfuric acid by volume percentage. Salt phase and 10% to 20% silver phase composition. Other parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the oxide ceramics / alkaline earth metal sulfate / silver composite material is composed of 40% oxide ceramic phase, 50% alkaline earth metal sulfate phase and 10% silver by volume percentage phase composition. Other parameters are the same as in the first embodiment.

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Abstract

An oxide ceramic / alkali-earth metal sulphate / silver composite material and a preparation method thereof relate to the preparation method of an oxide ceramic base composite material. The invention solves the problem that the existing oxide ceramic material has bad frictional wear performance in the wide area temperature of the room temperature to 760 DEG C and the existing preparation technology has the high sintering temperature. The oxide ceramic / alkali-earth metal sulphate / silver composite material comprises an oxide ceramic phase, an alkali-earth metal sulphate and a silver phase. The method is as follows: boll milling, wet mixing, drying and sieving; after being sieved, fine powder body is placed into a graphite die and processed in cold pressing way; and then electro-discharge is carried out on plasma sintering, thus obtaining the oxide ceramic / alkali-earth metal sulphate / silver composite material. The friction coefficients of the oxide ceramic / alkali-earth metal sulphate / silver composite material in the room temperature and 760 DEG C high temperature are respectively 0.05-0.2 and 0.18-0.25; the wear rate is lower than 10-6mm3 / N.m order of magnitude; and the method has simple technique and low sintering temperature.

Description

technical field [0001] The invention relates to an oxide ceramic matrix composite material and a preparation method thereof. Background technique [0002] Oxide ceramics (alumina, partially stabilized zirconia and alumina reinforced zirconia, zirconia toughened alumina ceramics) are traditional structural ceramics with high hardness, high strength, low density, high stiffness, and excellent chemical stability , plays an extremely important role in reducing the structural weight of aerospace structural materials and improving the structural efficiency, service reliability and prolonging the life of the aircraft, but the friction performance is poor at high temperatures, and the friction coefficient and wear rate are high. [0003] The friction coefficient of oxide ceramics strongly depends on the service conditions, the friction coefficient is between 0.2-0.4 at room temperature, and the wear rate is 10 -6 mm 3 / N·m. When the service condition is above 400°C, the friction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/12C22C29/00C22C32/00C22C30/00C22C1/05
Inventor 欧阳家虎李玉峰梁雪松刘占国周玉
Owner HARBIN INST OF TECH
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