振荡压力烧结法制备高性能结构陶瓷及烧结机理研究

项目名称： 振荡压力烧结法制备高性能结构陶瓷及烧结机理研究

项目编号： No.51502120

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 李双

作者单位： 山东理工大学

项目金额： 21万元

中文摘要： 本项目针对重大工程和极端环境对结构陶瓷强度、韧性和可靠性提出的日益苛刻的要求，拟在陶瓷材料烧结过程中施加振幅与频率可控的振荡压力，发展全新的振荡压力烧结法。区别于传统的无压烧结、热压烧结，振荡压力烧结法提供较高的烧结驱动力：(1)提高颗粒堆积密度，缩短物质扩散、迁移路径；(2)赋予材料多种烧结机制，加速致密化进程；(3)促进晶界处闭气孔的排出，降低缺陷浓度。本课题拟选择典型的固相烧结陶瓷氧化锆、液相烧结陶瓷氮化硅为研究对象，开展振荡压力烧结材料致密化进程、晶粒生长、缺陷消除、强韧化等的研究：采用实时位移检测系统测量粉体的致密化曲线，结合材料的晶粒尺寸变化，得到振荡压力烧结陶瓷的MSC曲线和烧结动力学窗口；研究振荡压力振幅、频率对陶瓷微观结构与宏观性能的作用规律，优化烧结工艺参数。本项目的实施，可以深入揭示振荡压力烧结规律和烧结机理，为高密度、细晶粒、低缺陷、高强度结构陶瓷的制备奠定基础。

中文关键词： 烧结原理；致密化过程；晶粒生长可控；力学性能；动力学窗口

英文摘要： With the advancement of major projects and extreme serving conditions, the mechanical performances of structural ceramics, such as strength, toughness and reliability, are becoming daily more important. Here, a novel oscillatory pressure sintering (OPS) was proposed, by applying an oscillatory pressure with controllable value and frequency during sintering. In this work, we chosen zirconia and silicon nitride as object, and investigated their densification, grain growth, defect removal, strength and toughness under OPS process. The densification route was obtained from the measuring-displacement system. Such route, as well as the variation of grain size, could provide us with the Master Sintering Curve (MSC) and kinetic Windows of OPS. The effect of pressure value and frequency on the microstructure and mechanical behaviors was investigated in detail, so as to achieve optimized technological parameters. Thus, this work could reveal the sintering mechanisms of OPS process, and build the basis for preparing advanced structure ceramics with high density, fine grains, little defects and excellent strength.

英文关键词： Sintering mechanism;Densification;Grain growth;Mechanical properties;Kinetic window