摘要
以天然的可再生资源淤泥沙为主要原料,以固体废弃物金属矿尾矿为调剂料,利用炭黑作还原剂,采用碳热还原氮化法合成了O′-Sialon-SiC-Fe3Si粉。用X射线衍射法测定了产物相组成及相对含量,研究了合成温度和恒温时间对反应过程的影响。结果表明,合成温度对O′-Sialon-SiC-Fe3Si粉体的合成过程影响显著,随着合成温度的升高,产物中O′-Sialon相含量增大,1500℃时O′-Sialon相含量最大,是最佳的合成温度。恒温时间对产物相组成的影响不十分显著,但较长的恒温时间可以使还原氮化反应进行得更充分,恒温6h的试样中O′-Sialon相含量达到了83%,是较理想的恒温时间。合成过程中SiO的挥发导致试样较大的质量损失,且随着合成温度的升高和恒温时间的延长而增大。
With recycling resources of Yellow River sand and abundant solid waste of metallic tailings as raw materials, carbon black as reduction agent, O＇-Sialon-SiC-Fe3 Si powders were synthesized by carbothermal reduction nitridation（CRN）. Phase composition of reaction products was determined by X-ray diffractometry. The influence of synthesis temperature and holding time on synthesis was discussed in detail. The results show that synthesis tempera ture affects the formation of O＇-Sialon-SiC-Fe3 Si significantly. Content of Or-Sialon in the products increases with the increase of synthesis temperature and reaches the maximum at 1500℃, which is assumed to be the best synthesis temperature. Holding time does not affect the phase composition significantly, but with holding time expending, carbothermal reduction nitridation reaction proceeds much sufficiently. Content of O3-Sialon in the samples reaches 83% at 6h, which is perfect holding time. Volatilization of SiO results in great mass loss of the samples and increases with synthesis temperature increasing and holding time expending.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2011年第24期111-114,共4页
Materials Reports
基金
国家科技支撑计划(2011BAB03B05
2008BAB32B14
2008BAB32B11)
