FeCoCrNiAl/Al_(2)O_(3)金属陶瓷坯体凝胶注模研究

Gel Injection Molding of FeCoCrNiAl/Al_(2)O_(3) Cermet Body

金属陶瓷兼有金属和陶瓷的特点,具有强度高、韧性好等优点,是材料领域的研究热点之一。以FeCoCrNiAl系高熵合金粉末和Al_(2)O_(3)陶瓷粉末为原材料,以无毒的水溶性环氧树脂为黏结剂,设计采用凝胶注模工艺的正交试验方案,制备FeCoCrNiAl/Al_(2)O_(3)金属陶瓷,探讨环氧树脂添加量、粉体固含量、分散剂添加量和粉体组分对FeCoCrNiAl/Al_(2)O_(3)金属陶瓷坯体的收缩率、致密度及抗弯强度的影响。结果表明各因素对坯体整体性能影响依次为粉体固含量>分散剂>粉体组分>环氧树脂添加量,其中粉体固含量对坯体性能影响最大,随着固含量的增大,坯体收缩率逐渐下降,抗弯强度逐渐增大,致密度先增加后降低。凝胶注模法制备的FeCoCrNiAl/Al_(2)O_(3)金属陶瓷成分均匀,断口呈现典型的脆性断裂特征。

Cermet has the characteristics of metal and ceramics,and the advantages of high strength and good toughness.It is one of the research hotspots in the field of materials.In this paper,FeCoCrNiAl high-entropy alloy powder and Al_(2)O_(3) ceramic powder are used as raw materials,and non-toxic water-soluble epoxy resin is used as a binder.An orthogonal test scheme is designed using gel injection molding process to prepare FeCoCrNiAl/Al_(2)O_(3) cermet.The effects of epoxy resin addition,powder solid content,dispersant addition and powder composition on the shrinkage,density and flexural strength of FeCoCrNiAl/Al_(2)O_(3) cermet body are discussed.The results show that the order of the effects of various factors on the overall performance of the body are powder solid content>dispersant>powder component>epoxy resin addition.Among them,the powder solid content has the greatest effect on the performance of the body,and with its increase,the shrinkage rate of the green body gradually decreases,the bending strength gradually increases,and the density first increases and then decreases.The FeCoCrNiAl/Al_(2)O_(3) cermet prepared by the gel injection molding method has a uniform composition,and the fracture exhibits typical brittle fracture characteristics.