Machinability Evaluation of Ce-ZrO_2/CePO_4 Ceramics with Digraph Method

摘要

A new method is proposed for machinability evaluation of machinable ceramic materials. The relation of machinability attributes is modeled as a digraph, and machinability attribute matrix is defined. Machinability indexes are calculated with permanent function of the matrix, and machinabilities of machinable ceramics are ranked. Five composites consisting of CePO_4 and zirconia were fabricated, measured and drilled with tungsten-cobalt carbide bits. Mechanical property parameters of Ce-ZrO_2/CePO_4 composites, including Vickers hardness, fracture toughness and Elastic modulus, are selected as machinability attributes. The experimental results of material removal rates are consistent with the ranking of machinability index values of Ce-ZrO_2/CePO_4 ceramics. The machinabilities of Ce-ZrO_2/CePO_4 ceramics improve with the increase of CePO_4 proportions. Machinability of machinable ceramics can be evaluated with digraph method.