硅酸盐学报

凝胶注模固化应力的研究

作者：金晓1 余娟丽1 杨金龙1 刘炜2

单位：1. 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室北京 100084 2. 中北大学材料科学与工程学院太原 030051

关键词：凝胶注模内应力应力感应器浆料固化

分类号：TQ 17416

出版年,卷(期):页码：2012,40(9):1271-1277

DOI：

摘要：

摘要：凝胶注模成型工艺作为一种原位凝固成型技术，可有效提高材料的可靠性，降低复杂形状陶瓷部件的制造成本；但在凝胶注模成型过程中，由于坯体内部易产生应力，在后续的干燥和排胶过程中极容易造成坯体开裂。为定量分析固化应力对坯体开裂的影响，利用自制的应力感应器对浆料在成型过程中产生的内应力大小进行了检测，研究了催化剂、引发剂、有机物浓度、有机单体与交联剂的比例、固相体积分数等对浆料固化内应力的产生以及排胶后坯体开裂的影响。结果表明：浆料在固化过程中会产生内应力，浆料中引发剂和单体含量的增加使得内应力增大；单体与交联剂质量比减小造成浆料的最高温度点升高，浆料固化过程中产生的应力增加，使得坯体排胶开裂现象更为严重。

Abstract: Gelcasting process is a consolidation in-situ forming technique, which can effectively increase the material reliability and reduce the manufacturing cost of complex-shaped ceramic parts. However, the internal stress easily occurs in the green body during gelcasting, affecting the performance of the green body during drying and de-bindering processes due to the presence of the cracks in green body. In order to quantitatively analyze the effect of consolidation stress on the cracks in green body, the internal stress generated in the process of slurry solidification was measured using a self-made stress sensor. The effects of process parameters (i.e., catalyst, initiator, concentration of organic mater, ratio of organic monomer to crosslinker and solid volume fraction) during gelcasting on the internal stress of slurry solidification and the crack of green body after de-bindering were systematically investigated. The results indicate that inner stress is generated during slurry solidification. The inner stress increases with the increase of initiator and monomer content in slurry, and the temperature in slurry increases with the decrease of the mass ratio of monomer to crosslinker, causing the increase of inner stress and the occurrence of serious crack in green body during de-bindering.

基金项目：

国家自然科学基金(51172120)；国家创新方法工作专项(2011IM030800)及北京市科技计划(Z101103055010003)资助项目。

作者简介：

第一作者：金晓(1986—)，男，博士研究生。通信作者：杨金龙(1966—)，男，博士，教授。

参考文献：

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