摘要
以锐钛矿(中位径0.38μm)、金红石(中位径4.58μm)和鳞片石墨(粒度<0.15mm)、炭黑(平均粒度0.02μm)、可膨胀石墨(粒度<0.15mm)为原料,固定配比nC∶nTiO2为5∶1时分别组成不同的原料组合,并以锐钛矿和鳞片石墨为原料,改变配比nC∶nTiO2分别为3∶1、4∶1、5∶1、6∶1、7∶1和8∶1进行配料,在管式电炉、流动N2中分别于1300℃和1400℃制备了TiN,并进行了合成产物的氧化脱碳试验;采用XRD测定TiN的特征峰(d200=0.212nm)强度,以表征TiN的合成率,研究了原料粒度、反应物活性、反应温度等因素对TiN合成率的影响。结果表明:选用粒度较细或晶格活性大的原料,提高反应温度,均有利于提高TiN粉末的合成率;合成TiN粉末的最佳原料组合是可膨胀石墨和锐钛矿;以鳞片石墨和锐钛矿为原料时,其配比为nC∶nTiO2=6∶1时TiN合成率最高;合成产物中均含有一定量的碳,采用普通的加热氧化法不能除碳,其原因是TiN的氧化温度低于石墨的。
The subject of this thesis studies on synthesis of titanium nitride powders by carbothermal reduction nitrifying method in tube electric stove and floating gaseous nitrogen at 1300 ℃ and 1400 ℃. The materials including anatase（ D50 =0.38 μm） ,rutile（ D50 =4. 58μm） and flaky graphite（ grain size 〈0.15 mm） ,charcoal black（ average size =0.02 μm）,expanable graphite（grain size 〈0.15 mm） were used as the starting materials. The two kinds of formulations are made up of different material composition but fixed proportion of nc ： nTiO2 =5 ： 1 ） and different proportion but fixed material of anatase and flaky graphite such as nc ： nTiO2 =3 ： 1,4 ： 1 ,5 ： 1 etc. The TiN＇ s synthesizing rate is analyzed by TiN＇ s XRD characteristic peak value（ d200 =0.212 nm）. The speciemens＇ oxidation decarbonization behavior is tested. Influence of material grain size,reactant activity and reaction temperature on TiN＇ s synthesizing rate is also analyzed. The results show that TiN＇ s synthesizing rate is improved because solid phase reaction can be enhanced by choosing finer active material and higher reaction temperature. The best choice of material composition to prepare TiN powder are expansion graphite and anatase. The best proportion of flaky graphite and anatase is nc ： nTiO2 =6 ： l.
出处
《耐火材料》
EI
CAS
北大核心
2006年第2期89-91,共3页
Refractories
关键词
碳热还原氮化
二氧化钛
石墨
氮化钛
Carbothermal reduction nitrifying method ,Titanium oxide, Graphite,Titanium nitride
