Aluminosilicate fiber reinforced oxide ceramics containing interfacial phase and preparation method thereof

Abstract

The invention relates to aluminum silicate fiber reinforced oxide ceramic containing an interface phase. The aluminum silicate fiber reinforced oxide ceramic adopts one or a mixture of more of mullite, aluminum silicate and aluminum oxide as a ceramic substrate and adopts aluminum silicate fiber as a reinforcing phase, and a sacrifice carbon interface phase is formed between the substrate and the reinforced phase. The preparation method of the aluminum silicate fiber reinforced oxide ceramic comprises the following steps: preparing a three-dimensional aluminum silicate fiber fabric, and preparing a pyrolytic carbon coating on the surface of the fiber fabric by utilizing a chemical vapor phase deposition process; taking oxide sol as a precursor, vacuum impregnating the fiber fabric, carrying out the gelatization, then carrying out the high-temperature ceramization, and completing the primary compacting process; repeating compacting for at least 10 times; finally carrying out oxidative cracking on carbon interface phase coating, forming a gap between the aluminum silicate fiber and the substrate, and preparing the product. The product is excellent in mechanical property both at the room temperature and high temperature and has the advantages of short preparation period, low cost, wide applicability and the like.

Description

technical field [0001] The invention mainly relates to the technical field of fiber-reinforced oxide ceramic material and its preparation, in particular to an aluminum silicate fiber-reinforced oxide ceramic and a preparation method thereof. Background technique [0002] Aeroengines, land-based engines and re-entry vehicles and other hot-end components have increasingly urgent demands on structural materials, requiring structural materials to have excellent long-term mechanical properties, high-temperature strength retention and environmental resistance. Continuous fiber reinforced ceramic matrix composites (CFRCMCs) are the most promising structural materials. Among them, oxide fiber-reinforced oxide composites are suitable high-temperature structural candidates due to their high strength, high toughness, refractory properties, and excellent environmental resistance. [0003] The interfacial properties of oxide fiber-reinforced oxide composites are extremely important, bec...

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Problems solved by technology

However, the patent does not report the fiber surface C 60 The morphology and the effect of the interstitial interface on the performance of the composite material, and the matrix of the composite material is limited to a kind of silica

In fact, the uniformity of the coating prepared on the surface of the fiber by the liquid phase method is poor, which leads to poor structural stability of the composite material at high temperature

In addition, the low modulus of the silica matrix and the low service temperature limit the high temperature application of the composite material

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