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首页> 外文会议>Conference and exhibition of the European ceramic society >Development of non-oxide ceramic matrix composites based on reactive infiltration and in situ growth of AlN bonding phase
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Development of non-oxide ceramic matrix composites based on reactive infiltration and in situ growth of AlN bonding phase

机译：基于反应性浸润的非氧化物陶瓷基复合材料及原位生长的非氧化物陶瓷基复合材料

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Novel ceramic composites (CMCs) wereprepared by reactive infiltration of porous (50-70%T.D.) ceramic preforms and in sun growth of an AlNbonding phase (10-35 vol%) from molten Al alloys. Thecontinuity of the forming phases results in a veryfavourable balance of both physical and mechanicalproperties. Moreover because the prepared compositeshave a continuous Al phase (5-15 vol%), they exhibitsome traditional macroscopic plasticity, despite beingapproximately 70 vol% ceramic. Preforms with optimalporosity and permeability were prepared byconventional ceramic processes using commerciallyavailable AlN, SiC and Si_3N_4 powders. Differentnon-oxide species were selected in order to demonstratethe flexibility of the preparation route. Wetting-assisted pressureless infiltration of Al into thepreforms was accomplished in nominally pure N_2 or underan argon atmosphere at temperatures between 850degC and1200degC. The AlN bonding phase was prepared bydisplacement reactions between Al and selectedcommercially available nitrides (Si_3N_4, Mg_3N_2,Zn_3N_2, 325 Mesh powders) previously deposited on thesurface of the porous ceramic body. Composite growthrates between 0.4 - 0.6 mm/min. were observed andcorrelated with the interfacial reaction enthalpychange. Initial characterisation of selectedmechanical properties (hardness, Young's modulus,compresive and flexural strength, toughness) of thecomposites with the same ratio of forming phases was also performed.
机译：通过多孔（50-70％T.）陶瓷预成型件和来自熔融Al合金的阿尔纳金（10-35体积）的太阳生长的新型陶瓷复合材料（CMC）。形成阶段的阴蒂会导致物理和机械效率的非常合理的平衡。此外，由于制备的合成呈连续的Al相（5-15体积％），它们展示了传统的宏观塑性，尽管是70体积％的陶瓷。使用商学历ALN，SiC和Si_3N_4粉末，通过分解陶瓷方法制备具有最佳孔隙度和渗透性的预制件。选择不同的氧化物物种以规范制备途径的柔韧性。在850degc和1200degc之间的温度下，在名义上纯N_2或氩气氛下完成润湿辅助的辅助无气压渗透。通过预先沉积在多孔陶瓷体的晶片上的Al和所选择的Commercery族氮化物（Si_3N_4，Mg_3N_2，Zn_3N_2，325目，Zn_3N_2，325目，325目，Zn_3N_2，325目，325目，325目的）中制备AlN键合相。复合增长率在0.4-0.6mm / min之间。用界面反应焓观察并围流。还进行了初始表征具有相同成形相比比的复合材料的选择性机械性质（硬度，杨氏模量，弯曲强度，韧性）。

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