温度对碳热还原制备TiC、TiN的影响研究

Influence of temperature on formation of titanium carbide,titanium nitride under carbothemal reduction

考察了在碳热还原制备TiC、TiN的过程中，温度对TiC、TiN生成状态的影响。将含钛渣样品置入石墨坩埚，在1300～1550℃，常压通N2，恒温6h观察TiC、TiN的生成状态。实验结果表明，TiN的生成温度是1350℃．TiC的生成温度是1500℃，与Fact Sage计算基本相符（Fact Sage计算的TiN的生成温度是1322℃，TiC的生成温度是1467℃）。通过对熔渣与石墨坩埚纵剖面宏观形貌、矿相、SEM—EDS的分析表明．TiN、TiC主要生成于熔渣与石墨坩埚交界处．随着温度的升高．其生成量增多并向熔渣内部扩散。

The influence of temperature on the formation status of titanium carbide, titanium nitride prepared by earbothemal reduction method was studied. Blast furnace slag-bearing titanium samples were subjected to 6 h for isothermal treatment with the temperature range of 1 300-1 550 ℃ in graphite crucibles with nitrogen flow. The temperature on the formation of titanium nitride and titanium carbide were 1 350 and 1 500 ℃ in the expert ments separately,which matched substantially with the calculation of Fact Sage （they were 1 322 ℃ for titanium nitride and 1 467 ℃ for titanium carbide respectively）. The longitudinal profiles of melted slag and graphite crucibles were characterized mainly by mineralogical microscope and SEM-EDS detection methods. As a result, the area of titanium nitride and titanium carbide mainly concentrated on the junction of melted slag and graphite crucible, whose amount were increased and which were diffused to the center of the slag as the temperature rose.