论文部分内容阅读
用热分析法研究了锂-碳体系.制备熔体和记录冷却曲线是在氩气氛中进行的. 确定了体系在锂和所生成的碳化锂(Li_2C_2)之间这一部分的状态图.锂和碳化锂形成低共熔体,低共熔体的组成靠近纯锂(合碳少于1原子%),其熔点为165°. 用沸点法测定了纯锂以及含碳少于15克原子%的熔体在790-950°的蒸气压.根据蒸气压的等压线确定了在较高温度范围内的液相线. 碳化锂被水完全分解,放出当量体积的乙炔,并无自由态的碳及其他物质残留. 热分析及Debye-Scherrer法的结果指出:碳化锂有几种变体,转化温度约在410°,440°和560°.
The lithium-carbon system was investigated by thermal analysis.The prepared melt and recorded cooling curve were carried out in an argon atmosphere.The state diagram of this part of the system between the lithium and the formed lithium carbide (Li 2 C 2) Lithium carbide forms a eutectic and the composition of the eutectic is close to pure lithium (less than 1 atomic percent co-carbon) and has a melting point of 165 ° C. Pure lithium and less than 15 gram atomic% Melt pressure of the melt at 790-950 ° The liquidus at higher temperature range was determined on the basis of the isobars of the vapor pressure Lithium carbide was completely decomposed by water to release the equivalent volume of acetylene without free carbon And other material residues.The results of the thermal analysis and the Debye-Scherrer method indicate that there are several variations of lithium carbide with transformation temperatures of about 410 °, 440 ° and 560 °.