氧化物与稀土磷酸盐复合陶瓷的切削加工性评价

Cutability Evaluation of Oxide Ceramics Containing Rare Earth Phosphates

应用模糊综合评判原理,评价可加工陶瓷材料的切削加工性,判断材料的切削加工性等级。通过Ce ZrO2/CePO4复合陶瓷的材料制备、性能测试、模糊综合评判和加工实验,研究了氧化物与稀土磷酸盐复合陶瓷的材料切削加工性。根据模糊数学提出一种可加工陶瓷材料切削加工性的综合评判方法。以陶瓷材料的力学性能参数为因素集,选择5种切削加工性等级,根据隶属函数计算模糊矩阵,通过模糊变换确定出氧化物与稀土磷酸盐复合陶瓷的切削加工性。综合评判结果将所制备的几种Ce ZrO2/CePO4复合陶瓷材料分为3个切削加工性等级,材料的切削加工性等级随CePO4含量的增加而提高,评判结果与钻削实验的材料去除率结果相符。Ce ZrO2/CePO4复合陶瓷材料的钻削加工表面具有明显的塑性变形加工痕迹。还分析了含LaPO4的其它氧化物复合陶瓷材料的切削加工性等级。材料切削加工性的评价方法建立了材料性能与加工技术之间的关系,可提供一种新的材料设计方法。

Cutabilities of machinable ceramics were evaluated and classified based on fuzzy comprehensive evaluation theory. Ce-ZrO_2/CePO_4 composites were fabricated, measured, machined and evaluated to research cutability of oxide ceramics containing rare earth phosphates. A comprehensive evaluation method was proposed for cutability assessments of machinable ceramics based on fuzzy set theory. Mechanical property parameters of composites were selected as alternative set. Five grades were chosen for the cutability evaluation of machiable ceramics. Fuzzy matrix was calculated for an alternative according to membership function. Then cutability grade of material was determined through fuzzy operation. Prepared Ce-ZrO_2/CePO_4 composites were classified as three cutability grades according to comprehensive evaluation results, which was consistent with the material removal rates in drilling experiments. The cutability grades of Ce-ZrO_2/CePO_4 composites increase with the proportions of CePO_4. There were obvious ductile machining marks on Ce-ZrO_2/CePO_4 composites drilling surfaces. Moreover, cutabilities of other oxides containing LaPO_4 were studied. The evaluation method for material cutability establishes the relation between material properties and machining technologies, and can provide oae new material design method.