|Cite this article as:|
|Yu Wang, Guohua Zhang, and Kuochih Chou, Preparation and oxidation characteristics of ZrC-ZrB2 composite powders with different proportions, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2330-2|
ZrC and ZrB2 are both typical ultra-high temperature ceramics, which can be used in hyperthermal environment. In this study, a method for preparing ultrafine ZrC-ZrB2 composite powder is provided, by using the raw materials of nano ZrO2, carbon black, B4C, and metallic Ca. It is worth pointing out that ZrC-ZrB2 composite powder with any proportion of ZrC to ZrB2 could be synthesized by this method. Firstly, a mixture of ZrC and C is prepared by carbothermal reduction of ZrO2. By adjusting the addition amount of B4C, ZrC is boronized by B4C to generate ZrC-ZrB2 composite powder with different compositions. Using this method, five composition powders with different molar ratios (100ZrC, 75ZrC-25ZrB2, 50ZrC-50ZrB2, 25ZrC-75ZrB2, and 100ZrB2) are prepared. When the temperature of boronization and decarburization process is 1473 K, the particle size of product is only tens of nanometres. Finally, the oxidation characteristics of different composite powders are investigated through oxidation experiments. The oxidation resistance of ZrC-ZrB2 composite powder continues to increase as the content of ZrB2 increased.