Grain Composition Design of the NiFe2O4 Spinel Ceramic
(0) In general, the properties of the materials are determined by their composites, structures and preparing technique. Especially for those ceramic materials, the structures and the preparing techniques are definitely affected on their properties. On the other hands, we can obtain higher performance materials by the way of control their composites, structures and preparing techniques. In this article, the grain graduation composition of NiFe2O4 spinel biscuit was studied on the ball arrangement theory by means of packed density experiments, in order to make the NiFe2O4, spinel ceramic possessing higher volume density and lower porosity. Four sizes of different main grains were decided beforehand according to the forming mould we used. The mass fraction and the diameter ratio of main grains vs. filling grains were found out at first, then the different quantity of fine powder was added to the spinel biscuits for the sake of obtaining optimal granularity. The packed density of the NiFe2O4 spinel ceramic biscuit was measured to determine the optimal grain composition. The results validated that the actual stacking form of the main grain fit the ball arrangement theory very well, and tend to be in the form of the body centered cubic or hexagonal close-packing, moreover the packed density was the greatest when the fraction of the coarse grains is 42 percent, medium grains was 18 percent and fine powder was 40 percent.
Grain composition Grain graduation Packed density Porosities NiFe2O4 spinel ceramic
Liu Yihan Yao Guangchun Luo Hongjie Min Li Sun Kai
School of materials & metallurgy, Northeastern University, China No.11, Lane 3, Wenhua Road, Heping Materials science & engineering department, University of Michigan, USA 22455 Hayward Rd., Ann Arbor
国际会议
沈阳
英文
306-309
2009-08-27（万方平台首次上网日期，不代表论文的发表时间）