Synthesis of TiB2 from a carbon-coated precursors method

被引:38
作者
Fu, Zhezhen [1 ,2 ]
Koc, Rasit [1 ]
机构
[1] Southern Illinois Univ, Dept Mech Engn & Energy Proc, Carbondale, IL 62901 USA
[2] Univ Maryland, Energy Res Ctr, Dept Mat Sci & Engn, College Pk, MD 20742 USA
关键词
hot pressing; microstructure; reaction path; synthesis; titanium diboride; CARBOTHERMAL REDUCTION; TITANIUM DIBORIDE; MECHANICAL-PROPERTIES; BORO/CARBOTHERMAL REDUCTION; POWDERS; COMPOSITES; MICROSTRUCTURE; CARBIDE; TIO2; TEMPERATURE;
D O I
10.1111/jace.14794
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
This article deals with the synthesis of TiB2 from carbon-coated TiO2 precursors with the addition of B4C. The carbon-coated precursors method alters the reaction process, compared with the conventional mixing of reactants, to produce high-quality TiB2 powders. The produced powders have a single phase, a submicron particle size (similar to 0.3 to 0.8m), regular shape, loose agglomeration, and low level of contaminations (less than 0.5wt% carbon and 0.6wt% oxygen). The formation mechanism proposed is based on experimental results and thermodynamic evaluations. For comparison, the powders obtained from the mixture of reactants show higher agglomeration, a large particle size (>1m), high level of contaminations (0.7wt% carbon and 1.1wt% oxygen), and difficulty to control the reaction process (formation of TiBO3 and Ti2O3 as the intermediate phases). The synthesized powders from the precursors method can be hot pressed to a relative density of similar to 94.5% with the formation of platelike grains at 1800 degrees C under a pressure of 35MPa without additives.
引用
收藏
页码:2471 / 2481
页数:11
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