Reactive carbothermal reduction of ZrC and ZrOC using Spark Plasma Sintering
Reactive carbothermal reduction of ZrC and ZrOC using Spark Plasma Sintering
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DOI：
10.1080/17436753.2018.1510817
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发表时间：
2018-10-17
影响因子：
2.2
通讯作者：
Lee, William Edward
中科院分区：
文献类型：
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作者：
Giorgi, Edoardo;Grasso, Salvatore;Lee, William Edward
以氧化锆和碳粉为原料，采用反应放电等离子烧结（RSPS）法制备了碳化锆和碳化氧块体。考察了保温温度、单轴压力和加热速率对最终化学成分/化学计量的影响。加热速率（20-200℃min(-1)）对RSPS无显著影响。增大烧结压力会阻碍碳热还原。这是因为封闭孔隙中存在气体。在无压力条件下，反应开始于1300摄氏度左右，还原在10分钟内完成，氧含量低至1.47 at.-%。在16 MPa的压力下，反应开始转移到1830℃。亚微米氧化锆粉(
Zirconium carbide and oxycarbide bulks were produced via Reactive Spark Plasma Sintering (RSPS) using zirconia and carbon powders. The effects of dwell temperature, uniaxial pressure and heating rate on final chemical composition/stoichiometry were investigated. Heating rates (20-200 degrees C min(-1)) had no significant effect on RSPS. The carbothermal reduction was hindered by increasing the sintering pressure. This was because of gases entrapped within the closed porosity. Under pressure-less conditions, the reaction onset started at similar to 1300 degrees C and the reduction was completed within 10 min resulting in an oxygen content as low as 1.47 at.-%. Under 16 MPa applied pressure, the reaction onset was shifted to 1830 degrees C. Sub-micrometric zirconia powder (