天然鉱物からの窒化ケイ素ウイスカの合成

概要

論文の詳細を見る
Silicon llitride whiskers have been prepared by reduc tion and nitridation of natural resources, occurred in Oita prefecture, such as Asono diatomaceous earth, Beppu Terra abla, Youra quartzite and casting sand, at 1370℃ in an NH_3 N_2 stream on a carbon plate. Two types of Si_3N_4 whiskers, short needlelike whisker (in side whisker) and woollike whisker (outside whisker) were obtained from the inexpensive raw materials. The shape of these whiskers, however, varied with the intrinsic composition of the starting materials. The out side whiskers obtained from the casting sand were almost all composed of Si_3N_4 with a few whiskers com posed mainly of Al, and which looked like abacus or connected hexagonal beads. The outside whiskers ob tained froun the four kinds of raw materials had droplets on one of their ends, indicating that the out side whiskers grow by the VLS mechanism. The droplets produced from diatomaceous earth and quar tzite were mainly composed of Fe and Si. On the other hand, those froun Terra abla were composed of Fe, Si and a small amount of Ti. In the case of the casting sand, two types of droplets, one composed of Fe and Si and the other composed of Cr, Fe and Si, were ob served. These metals, which composed the droplets, were derived from metal oxides in the raw materials. The metal elements are thought to have migrated from the starting material to the outside whisker in a vapor phase.
社団法人日本セラミックス協会の論文
1994-05-01

天然鉱物からの窒化ケイ素ウイスカの合成

スポンサーリンク

概要

著者

関連論文

スポンサーリンク