Pulsed Current Activated Rapid Sintering of Binderless Nanostructured TiC and WC and Their Properties

Kwak, Bong-Won; Yoon, Jin‐Kook; Shon, In-Jin

doi:10.1166/jnn.2017.13388

Cited by 1 publication

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“…Girardini et al [ 40 ] compared the densities of micro- and nano-WC with increasing sintering temperature as shown in Fig. 3 d. Obviously, there exists a densification delay for micro-WC powder in comparison with nano-WC powder, indicating that nano-WC powder possesses better sintering activity [ 24 , 59 – 61 ]. The driving force for densification of WC in general results from a reduction in total surface energy.…”

Section: Densification Of Binderless Tungsten Carbidementioning

confidence: 99%

A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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HIGHLIGHTS• Establish processing-composition-microstructure-property relationships governing binderless tungsten carbide (BTC).• Highlight the densification improving strategies and toughening methods for BTC.• Provide key challenges as well as the outlook for superior peformance associated with BTC.ABSTRACT WC-Co alloys have enjoyed great practical significance owing to their excellent properties during the past decades. Despite the advantages, however, recently there have been concerns about the challenges associated with the use of Co, i.e. price instability, toxicity and properties degeneration, which necessitates the fabrication of binderless tungsten carbide (BTC). On the other hand, BTC or BTC composites, none of them, to date has been commercialized and produced on an industrial scale, but only used to a limited extent for specialized applications, such as mechanical seals undergoing high burthen as well as high temperature electrical contacts. There are two challenges in developing BTC: fully densifying the sintered body together with achieving a high toughness. Thus, this review applies towards comprehensively summarize the current knowledge of sintering behavior, microstructure, and mechanical properties of BTC, highlighting the densification improving strategies as well as toughening methods, so as to provide reference for those who would like to enhance the performance of BTC with better reliability advancing them to further wide applications and prepare the material in a way that is environment friendly, harmless to human health and low in production cost. This paper shows that the fabrication of highly dense and high-performance BTC is economically and technically feasible. The properties of BTC can be tailored by judiciously selecting the chemical composition coupled with taking into careful account the effects of processing techniques and parameters.

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