晶须自增韧与金属复合耦合增韧氮化硅陶瓷机制的研究

项目名称： 晶须自增韧与金属复合耦合增韧氮化硅陶瓷机制的研究

项目编号： No.51274093

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 矿业工程

项目作者： 银锐明

作者单位： 湖南工业大学

项目金额： 80万元

中文摘要： 采用动、静态微观表征，通过粉末烧结热力学、微结构设计与断裂力学理论，分析稀土氧化物等助剂对非均相沉淀-热还原-常压烧结制备核壳结构Fe-Mo/Si3N4金属陶瓷材料微结构特征、组分的影响关系，明晰不同烧结状态晶相之间反应趋势、晶须生长模式等共性机理问题，通过对多因素影响下晶须生长模拟，外加载荷作用该材料的微观断裂机理，深化晶相结合状态、晶须形貌分布、膨胀系数匹配与微裂纹形核、生长及运动特性的内在联系认识，深度探讨自增韧与纳米金属包覆等多种机制耦合增韧氮化硅陶瓷机理。本项目通过研究旨在进一步完善束缚该类陶瓷材料致命缺陷即性本脆的关键机理问题，对丰富和完善多种机制耦合增韧陶瓷理论，推导该类陶瓷的更深层次应用具有重要意义。

中文关键词： 自增韧；金属复合；氮化硅；耦合；增韧机制

英文摘要： Based on the theory of powder sintering thermodynamics, microstructure design and fracture mechanics, the cermet materials is characterized by static and dynamic microscopic analysis.In this research project, Fe-Mo/Si3N4 cermet is prepared by he heterogeneous precipitation-thermal atmospheric pressure sintering. The Effect of rare earth oxides on micro-structural features and components of Fe-Mo/Si3N4 cermet is analyzed.The common mechanism such as reaction trend between different sintering state and the growth model of Whisker is clarified . Based on simulation of Whisker growth under multifactorial factors and micro fracture mechanism under applied load, the state of phase combination , the distribution of whisker morphology, matching of the expansion coefficient and the characteristics of Micro-crack nucleation, growth and motion are deepen understanded.the coupled toughening mechanism of silicon nitride ceramic through self-toughening and the of covering nano-metal are discussed on depth. The main purpose of this study aimed at resolving the fatal flaw of such ceramic materials，that is the key mechanism problem of sex crisp, it is very significance to rich and perfect the theory to coupled toughened ceramics using a variety of mechanisms, and to promote the deeper applications of such ceramics.

英文关键词： self-toughening；;metal composite；Si3N4；synergistic toughening；toughening mechanism