Synthesis of nano (Ti,W)C powder with preferred orientation and twin boundary structure

Zhang，Li1; Liang，Yan1; Gu，Jing hong1; Yan，Xiang yu1; Li，Xia2; Yu，Peng2; Wang，Li1

2022-05-01

10.1016/j.apt.2022.103550

ADVANCED POWDER TECHNOLOGY   影响因子和分区

0921-8831

1568-5527

(Ti,W)C is a novel additive for high performance cermets. In this study, (Ti0.88W0.12)C with the lowest formation energy is synthesized by carbothermal reduction-carbonization in Ar. The starting materials included WO2.72 with one-dimensional nanostructure, TiO2 and carbon black. The phase transition temperatures were established by thermal analysis. XRD analysis results disclose that once TiC is formed at a temperature over 1220 degrees C, W atoms begin to diffuse into the TiC lattices, which is independent of the existing form of tungsten. At a condition of 1500 degrees C for 180 min, W and C atoms from the decomposed W2C and WC are fully dissolved in the TiC lattices. Under such a TiC-centered atomic reconfiguration environment, the as-synthesized powder is featured with a BET particle size of 76 nm and texture coefficients TC(111) of 1.53 and TC(200) of 1.33. Results from SEM and HRTEM reveal that the roughly equiaxed powder particles have characteristics of readily identified twin boundary structure and stacking faults. Microscopic inhomogeneity of W solution atoms is discussed. The revelation of the easily identified twin boundary structure and stacking faults is of great significance to the hard phase regulation for high performance Ti(C,N)-based cermets. (C) 2022 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. All rights reserved.

Nano (Ti,W)C powder Texture coefficient Twin boundary structure Violet tungsten oxide Carbothermal reduction-carbonization Cermet

SCI ; EI

英语

其他

Natural Science Foundation of Hunan Province, China[2019JJ40373] ; National Natural Science Foundation of China, China[51574292]

Engineering

Engineering, Chemical

WOS:000830317700002

ELSEVIER

20221511947522

Atoms ; Carbon black ; Carbonization ; Carbothermal reduction ; Cermets ; Particle size ; Particle size analysis ; Textures ; Thermal conductivity ; Thermoanalysis ; Titanium dioxide

Metallurgy and Metallography:531 ; Thermodynamics:641.1 ; Chemistry:801 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

CHEMISTRY

2-s2.0-85127711206

Web of Science

1.State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zhang，Li,Liang，Yan,Gu，Jing hong,et al. Synthesis of nano (Ti,W)C powder with preferred orientation and twin boundary structure[J]. ADVANCED POWDER TECHNOLOGY,2022,33(5).

Zhang，Li.,Liang，Yan.,Gu，Jing hong.,Yan，Xiang yu.,Li，Xia.,...&Wang，Li.(2022).Synthesis of nano (Ti,W)C powder with preferred orientation and twin boundary structure.ADVANCED POWDER TECHNOLOGY,33(5).

Zhang，Li,et al."Synthesis of nano (Ti,W)C powder with preferred orientation and twin boundary structure".ADVANCED POWDER TECHNOLOGY 33.5(2022).