Conditions of formation and some properties of zirconium oxycarbides
Conditions of formation and some properties of zirconium oxycarbides
复制标题
碳氧化锆的形成条件和一些性质
DOI：
10.1007/bf00802878
复制
发表时间：
1972
期刊：
影响因子：
--
通讯作者：
G. Kozina
中科院分区：
文献类型：
--
作者：
T. Kosolapova;V. B. Fedorus;A. Panasyuk;G. Kozina
文献中似乎没有发表过关于Zr-CO体系构成图的资料。然而，在高温下碳还原二氧化锆的研究中，作为中间产物得到了氧化锆的存在[1-7]。如前所述，碳化物ZrCo的反应。S9与二氧化锆在1600 ~ 2000℃的真空条件下，通过还原生成的缺乏碳的碳化锆和氧化锆的相互溶解，形成可变组成的碳化氧。本文研究了碳化锆和氧化锆的相互溶解度，确定了单相氧化锆的存在边界和某些性质。为此，ZrC0。在温度为2000℃，压力为NI0 mm Hg的条件下，研究了不同比例的98和ZrO2，并用x射线结构、化学和金相分析对实验结果进行了评价。化学物相分析的方法是在硫酸和双氧水的混合物中选择性地溶解二氧化锆和碳化锆基相。氧含量用I00-E （Zr+ Ctotal）的差值来评价，尽管在某些情况下也用真空萃取法来测定。从表1中可以看出，这两种方法得到的结果非常吻合。
No information appears to have been published in the literature on the constitution diagram of the system Zr-CO. However, the existence has been reported of zirconium oxycarbides, obtained as intermediate products in investigations of the reduction of zirconium dioxide by carbon at high temperatures [1-7]. As has been demonstrated earlier [8], the reaction of the carbide ZrCo. s9 with zirconium dioxide in a vacuum at temperatures in the range 1600-2000~ leads to the formation of a variable-composition oxycarbide through the mutual dissolution of the carbon-deficient zirconium carbide and zirconium monoxide evolved as a result of reduction.The present work was undertaken with the aim of studying the mutual solubility limits of zirconium carbide and zirconium monoxide and also of determining the boundaries of existence and some properties of single-phase zirconium oxycarbide. For this purpose, the reaction between ZrC0. 98 and ZrO2, taken in various proportions, was investigated at a temperature of 2000~ and a pressure of NI0 mm Hg. X-ray structural, chemical, and metallographie analyses were employed for evaluating the results of experiments. The method of chemical phase analysis is based on the selective dissolution of zirconium dioxide and a zirconium carbide base phase in a mixture of sulfuric acid and hydrogen peroxide [8]. Oxygen contents were evaluated as the difference I00-E (Zr+ Ctotal), although in some cases they were also determined by the vacuum extraction method. Table 1 shows that values obtained by these two methods are in good agreement.