NaBr-KCl和不同炭源对合成Ti(C,N)粉末的影响

Effects of NaBr-KCl and different carbon sources on synthesis of Ti(C,N)powder

采用质量分数76．9％的钛白粉分别和23．1％的炭黑、石墨或活性炭，或者40％的钛白粉和60％的淀粉为原料，10％NaBr—KCl为添加剂，试样经干法成型后，在埋炭条件下分别于1300℃、1400℃保温3h处理，利用XRD、SEM、EPMA分析了合成粉末的物相组成和微观形貌，研究了在埋炭条件下不同炭源及NaBr—KCl的存在与否对碳热还原法合成Ti（C，N）的影响。结果表明：分别以石墨、炭黑、活性炭或淀粉作为炭源均可合成Ti（C，N）；外加剂NaBr—KCl的存在对以淀粉和炭黑为炭源的反应促进作用较大。在NaBr—KCl存在条件下，以炭黑为炭源经1300℃3h合成的Ti（C，N）晶粒大小为5～8μm；而分别以石墨、活性炭或淀粉作为炭源经1400℃3h合成的Ti（C，N）晶粒大小为1～3μm。

Ti（C, N） powders were prepared with 76.9% titania white and 23.1% carbon black, graphite or activated carbon respectively,or 40% titania white and 60% amylum as starting materials,10% NaBr-Cl as additive,after dry moulding,carbon embedded firing at 1300 ℃ and 1 400 ℃ for 3 h respectively. Phase composition and microstructure of the synthesized powder were analyzed by XRD, SEM and EPMA. Effects of different carbon sources and NaBr-KCl on the synthesis of Ti（ C, N） were researched. The results show that. （1 ） Ti （ C, N） can be prepared by seperately using carbon black, graphite, activated carbon or amylum as carbon source; （2） Additive NaBr - KCl is more favorable for accelerating the carbothermal reduction reaction using carbon black or amylum as carbon source;（3）In the presence of NaBr-KCl, particle size of synthesized Ti（C,N）is 5～8 μm using carbon black as carbon source after firing at 1300 ℃ for 3 h,while that is only 1～3 μm using graphite,activated carbon or amylum after firing at 1400 μ for 3 h.