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., 29(2022), No. 3, pp.521-528. https://dx.doi.org/10.1007/s12613-021-2330-2
Yu Wang, Guohua Zhang, and Kuochih Chou, Preparation and oxidation characteristics of ZrC–ZrB2 composite powders with different proportions, Int. J. Miner. Metall. Mater., 29(2022), No. 3, pp.521-528. https://dx.doi.org/10.1007/s12613-021-2330-2
shu
引用本文 PDF XML SpringerLink

不同比例ZrC–ZrB2复合粉的制备及氧化特性研究

摘要: ZrC和ZrB2都是熔点超过3000°C的化合物，是典型的超高温陶瓷，可被用作极端服役条件下的材料。由于ZrC和ZrB2的晶格结构不同，导致两者的物理化学特性存在差异。这也使得ZrC–ZrB2复合材料的综合性能往往高于单相材料。此类超高温陶瓷材料往往是通过粉末烧结法制备，超细粉体有利于再较为温和的条件下制备出细晶材料。目前已有的关于ZrC–ZrB2复合粉制备方法通常无法兼顾产品质量、成本控制、生产规模、工艺稳定性等方面。 因此，低成本、大规模且可控地制备超细ZrC–ZrB2复合粉末将对该材料的应用推广起到重要的促进作用。本研究提供了一种以纳米ZrO2、炭黑、B4C和金属钙为原料制备超细ZrC–ZrB2复合粉体的方法。该方法可以合成单相的ZrC和ZrB2以及任意比例的ZrC–ZrB2复合粉体。采用碳热还原法制备了ZrC和C的混合物。随后，通过调整B4C的加入量来控制ZrC–ZrB2复合粉体的成分比例。利用该方法，制备了五种不同ZrC/ZrB2摩尔比的粉末（100ZrC、75ZrC–25ZrB2、50ZrC–50ZrB2、25ZrC–75ZrB2和100ZrB2）。根据微观形貌分析，在1473 K下制备的产物的粒径为几十纳米，其中ZrC和ZrB2分别为立方和片状颗粒。根据ZrC特殊的核壳结构，推断其渗硼过程是由ZrC颗粒表面向颗粒中心逐渐推进的渗硼反应。最后，研究了不同配比的复合粉体的氧化特性。结果表明，随着ZrB2含量的增加，ZrC–ZrB2复合粉体的抗氧化性不断提高。当ZrB2的摩尔分数大于75mol%时，复合粉体的氧化特性接近纯ZrB2。

 

Preparation and oxidation characteristics of ZrC–ZrB2 composite powders with different proportions

Abstract: ZrC and ZrB2 are both typical ultra-high temperature ceramics, which can be used in the hyperthermal environment. In this study, a method for preparing ultrafine ZrC–ZrB2 composite powder was 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 was prepared by carbothermal reduction of ZrO2. By adjusting the addition amount of B4C, ZrC was boronized by B4C to generate ZrC–ZrB2 composite powder with different compositions. Using this method, five composite powders with different molar ratios of ZrC and ZrB2 (100ZrC, 75ZrC–25ZrB2, 50ZrC–50ZrB2, 25ZrC–75ZrB2, and 100ZrB2) were prepared. When the temperature of boronization and decarburization process was 1473 K, the particle size of product was only tens of nanometres. Finally, the oxidation characteristics of different composite powders were investigated through oxidation experiments. The oxidation resistance of ZrC–ZrB2 composite powder continued to increase as the content of ZrB2 increased.

 

    HTML全文
    • 资源附件(1)

    • 参考文献(29)

    参考文献(29)
    • 相关文章
    施引文献

/

返回文章
返回