摘要
以金矿尾矿为主要原料,炭黑作还原剂,采用碳热还原氮化法合成了Ca-α/β-Sialon复合粉体。探讨了烧成温度、保温时间及埋粉体系对反应过程的影响,并用X射线衍射仪测定了产物相组成,扫描电子显微镜观察了产物的微观结构。结果表明,烧成温度对Ca-α/β-Sialon复合粉体的合成过程影响显著,在1550℃时各物相相对含量为I(α-Sialon)∶I(β-Sialon)∶I(Fe3Si)=52∶44∶4;较长的保温时间可使还原氮化反应进行得更充分,保温6h的试样中Ca-α-Sialon与β-Sialon相的含量达到了96%;埋焦炭有利于氮气的渗入,利于氮化反应的进行,起到了较好的抑制"失硅"的作用;晶粒形貌多以长柱状和短柱状为主。
With metallic tailings as raw materials, carbon black as reduction agent, Ca-a/β-Sialon powders were synthesized by carbothermal reduction nitridation（CRN）. The influence of synthesis temperature, holding time and overlay powders system on synthesis was discussed in detail. Phase composition of reaction products was determined by Xray diffractometry. The microstructure of reaction products was observed by scanning electron microscope. The results show that synthesis temperature affects the formation of Ca-a/β-Sialon significantly. Relative content of each phase in the products is I（a-Sialon） ： I（β Sialon） ： I（Fe3 Si）= 52 ： 44 ： 4. Carbothermal reduction nitridation reaction proceeds much sufficiently with longer holding time. Relative content of Ca-a-Sialon and β-Sialon phases in the products reaches 96%. Overlay carbon powders avail for CRN and can restrain silicon loss.Ca-a/β-Sialon grains take on long and short column.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2012年第16期125-128,共4页
Materials Reports
基金
国家科技支撑计划(2011BAB03B05)
辽宁省教育厅科技研究项目(L2011078)
