受约束薄膜各向异性烧结致密化及其连续介质力学模拟

项目名称： 受约束薄膜各向异性烧结致密化及其连续介质力学模拟

项目编号： No.51272060

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 左如忠

作者单位： 合肥工业大学

项目金额： 81万元

中文摘要： 针对受约束烧结问题的普遍性、实用性和基础科学性，以优化受约束薄膜烧结行为的预测和模拟为研究思路，完善烧结的连续介质力学理论和实现零径向收缩烧结为研究目的，本项目以低温共烧陶瓷（LTCC）这一在陶瓷封装领域有广泛应用背景的材料为典型代表，类比研究圆柱型块状样品和硬质基板（高纯高密度氧化铝陶瓷）上颗粒薄膜的宏观烧结形变行为，探索基板约束和薄膜的烧结致密化、微结构特征以及薄膜材料自身特征的相关性；研究陶瓷样品烧结形变对单轴载荷的响应及其微结构特征，实现零径向收缩烧结的技术途径；在经典烧结理论（离散模型和连续模型）的基础上，结合烧结体的微观尺度参数，建立适用于受约束烧结问题的连续介质力学本征方程，结合圆柱样品零收缩烧结和薄膜受约束烧结致密化的实验测定，分析计算方程中的本征参数（粘度和泊松系数）张量，并用以模拟受约束薄膜的烧结致密化行为，为深化薄膜烧结等一类受约束烧结问题的研究奠定实验和理论基础。

中文关键词： 受约束烧结；自由烧结；薄膜；连续介质力学；微结构

英文摘要： Constrained sintering problems belong to a fundamental science in material science and engineering, characteristic of the universality and practicability. Using the optimization of the prediction and modeling of contrained film sintering as an idea, and taking the modification of contiuum mechanics of sintering and the realization of zero-shrinkage sintering as a research goal, we take a LTCC ceramic, which is a typical material in the field of ceramic packaging, as a typical candidate in this project in order to comparatively investigate macro sintering behavior of cylindrial samples and particulate films on a stiff substrate. The relationship between the substrate constraint, thin film densification, microstructure and film materials was explored. The response of sintering strains to the uniaxial load and the microstructural feature were studied in order to obtain a technique for zero-shrinkage sintering. Based on classic sintering theories (discrete and continuum models), using micro-scale parameters of sintering bodies, we attempt to build constitutive equations for constrained sintering problems. By experimentally determining the densification data of zero-shrinkage sintering of cylindrical samples and thin film sintering, we aim to achieve various tensors of constitutive parameters. At the same time, the

英文关键词： constrained sintering；free sintering；thin films；continuum mechanics；microstructure