Synthesis of (Ca,Mg)α′-Sialon-AlN-BN powders from boron-rich blast furnace slag by microwave carbothermal reduction-nitridation
(Ca,Mg)α′-Sialon-AlN-BN powders were synthesized by carbothermal reduction and nitridation (CRN) method using boron-rich slag, one of the intermediate products from pyrometallurgy separation of pageit, as the staring material. The influences of synthesis temperature and holding time on phase composition and microstructure during a microwave CRN were studied by XRD, SEM and EDS. The comparison between two heating techniques, conventional and microwave heating, to the synthesized powder was presented as well. The experimental results revealed that the phase compositions and microstructures of the synthesized products were greatly affected by synthesis temperature and holding time. With an increase in the synthesis temperature and holding time, the relative amount of α′-Sialon increased and became the main crystalline phase at 1400 amount of β-SiC. Elongated α′-Sialon grains, short rod AlN grains, aggregate nanoscale BN grains were observed in synthesized powders. The reaction temperature of microwave heating method was reduced by 80 was shortened by 2h, and more elongated α′-Sialon grains with large aspect ratio were observed.
(Ca,Mg)α′-Sialon-AlN-BN microwave boron-rich blast furnace slag carbothermal reduction- nitridation,powders
Tao JIANG Xiangxin XUE
School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials, Shenyang 110819, China
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-9
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）