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首页> 外文会议>China International Conference on High-Performance Ceramics;CICC; 20070510-13;20070510-13; Changsha(CN);Changsha(CN) >Reaction Processes and Thermodynamic Modeling for SiAION Structural Ceramic Powders Synthesized from Nonmetallic Mine
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Reaction Processes and Thermodynamic Modeling for SiAION Structural Ceramic Powders Synthesized from Nonmetallic Mine

机译：非金属矿合成SiAION结构陶瓷粉的反应过程和热力学模型

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摘要

SiAlON family matrix materials have been fabricated from nonmetallic mine. The process of Carbothermal Reduction and Nitridation (CRN) is selected on the basis of raw rocks containing various Si/Al ratios. Thermodynamic analysis of Si-Al-O-N system at different sintering temperatures indicates once the temperature is above 1673 K, a series of chemical reactions occur in sequence, SiO_2, SiO, Si_2N_2O, SiO_2+Al_2O_3, mullite, X-SiAlON, O'-SiAlON, β-SiAlON, SiAlON- polytypiods and Si_3N_4+AlN. Moreover, most of the reactions are exothermal and are promoted by further heating. The adding or in-situ formed SiC can reduce mullite and Al_2O_3 to produce O'- or β-SiAlON, and its reaction is surprisingly endothermic and is inhibited when further heated. Also, atmosphere is essential to affect the sintering process. Either raising N_2 partial pressures or reducing CO partial pressures can accelerate CRN progress. Correspondingly, phase content and microstructure of the product converted from nonmetallic ore are in detail investigated via X-ray diffraction (XRD) and scanning electron microscopy (SEM).
机译：SiAlON系列基体材料是用非金属矿山制造的。碳热还原和氮化（CRN）的过程是基于包含各种Si / Al比的原始岩石来选择的。 Si-Al-ON系统在不同烧结温度下的热力学分析表明，一旦温度超过1673 K，就会发生一系列化学反应，依次为SiO_2，SiO，Si_2N_2O，SiO_2 + Al_2O_3，莫来石，X-SiAlON，O'- SiAlON，β-SiAlON，SiAlON-多型和Si_3N_4 + AlN。而且，大多数反应是放热的，并且通过进一步加热来促进。加入或原位形成的SiC可以还原莫来石和Al_2O_3生成O'-或β-SiAlON，其反应令人惊讶地是吸热的，并在进一步加热时被抑制。而且，气氛对于影响烧结过程是必不可少的。升高N_2分压或降低CO分压均可加快CRN的进程。相应地，通过X射线衍射（XRD）和扫描电子显微镜（SEM）详细研究了由非金属矿石转化的产物的相含量和显微结构。

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