Cermets: I, Fundamental Concepts Related to Micro‐structure and Physical Properties of Cermet Systems

Humenik, M.; Parikh, N.M.

doi:10.1111/j.1151-2916.1956.tb15624.x

Cited by 167 publications

(44 citation statements)

References 2 publications

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“…For example, the addition of Mo to the TiC-Ni system decreases the contact angle from 30°to 0° [29]. Also, surface chemistry depends on the processing atmosphere, but often this is not intentionally controlled [30].…”

Section: Contact Angle and Dihedral Anglementioning

confidence: 99%

Review: liquid phase sintering

2009

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Liquid phase sintering (LPS) is a process for forming high performance, multiple-phase components from powders. It involves sintering under conditions where solid grains coexist with a wetting liquid. Many variants of LPS are applied to a wide range of engineering materials. Example applications for this technology are found in automobile engine connecting rods and high-speed metal cutting inserts. Scientific advances in understanding LPS began in the 1950s. The resulting quantitative process models are now embedded in computer simulations to enable predictions of the sintered component dimensions, microstructure, and properties. However, there are remaining areas in need of research attention. This LPS review, based on over 2,500 publications, outlines what happens when mixed powders are heated to the LPS temperature, with a focus on the densification and microstructure evolution events.

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Section: Contact Angle and Dihedral Anglementioning

confidence: 99%

Review: liquid phase sintering

2009

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“…20) However, WC-Co (micron size) is not known to show a notable coalescence and the coalescence results from the high surface energy between carbide (or nitride) and the liquid phase. 20) Although it is not clear at this point that coalescence is the cause of the initial WC growth, our study confirms that the major growth of WC occurs not only during the initial stage but during the sintering stage as well, provided no VC is present. In particular, the most effective role of VC in inhibiting WC growth was observed during the sintering stage.…”

Section: Effect Of Vc On the Solubility Of W In Comentioning

confidence: 99%

Growth Inhibition of Nano WC particles in WC-Co Alloys during Liquid-Phase Sintering

Seo¹,

Kang²,

Lavernia³

2003

Mater. Trans.

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WC-10Co-xVC alloys were produced using two different sizes of WC powders (200 nm and 4.4 mm) via planetary milling and a liquidphase sintering technique. When VC was added to the WC-Co alloys, the growth of WC particles was effectively suppressed. However, this process was dependent on the amount of additive used. Since the average WC particle size became less than 1 mm, the system experienced a significant loss in carbon, resulting in the formation of an undesirable phase. The goal of this study was to determine the role of VC in controlling growth and to verify its effectiveness as a function of average WC size and inhibitor content. It was found from XRD and HREM studies that the (W,M)C phase was formed in WC-10Co-xVC-C systems. The effect of V or VC on the solubility of W in the Co matrix was also examined using HREM/EDS. The findings indicate that the presence of VC tends to reduce the solubility of W in a Co melt, thus inhibiting the dissolution and growth of WC.

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“…The mechanical properties of TiCNi cermet was reported in 1960s 1) and transverse rupture strength (TRS) and hardness were as low as about 1 GPa and 600 HV. Humenik and Parikh report 2,3) that molybdenum enhances the wettability between hard phase and binder phase. Actually, TRS and the hardness of cermets including molybdenum in TiC or TiCTiN were improved as above 1.5 GPa and 1000 HV.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni Contents on Microstructures and Mechanical Properties for (Ti<sub>0.8</sub>Mo<sub>0.2</sub>)C-Ni Cermets

et al. 2014

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The (Ti 0.8 Mo 0.2 )C-xNi cermets (x = 10, 20, 30 and 40 mass%) were prepared by two milling processes; first, the (Ti 0.8 Mo 0.2 )C produced by mechanical alloying of Ti, Mo and C powders (Process I). Second, mechanical alloyed (Ti 0.8 Mo 0.2 )C and commercial Ni powders mixed by tumbling ball milling (Process II) for 72 h. On (Ti 0.8 Mo 0.2 )C-40Ni, the milling time of Process II was 96 h in addition of 72 h. The Vickers hardness with fracture toughness and the quantitative microstructural parameters were measured and analyzed. The relationship between fracture toughness and hardness for the cermets was on the fitted curve derived from the previous data for the cermets, except for the case of (Ti 0.8 Mo 0.2 )C-40Ni for 72 h, which is lower fracture toughness than that for the previous works and (Ti 0.8 Mo 0.2 )C-40Ni for 96 h. The contiguity of the samples tend to increase with increasing hard phase contents except for the case of (Ti 0.8 Mo 0.2 )C-40Ni for 72 h, which is higher than those of (Ti 0.8 Mo 0.2 )C-40Ni for 96 h. On the other hand, the coefficient of variation for hard phase of the both (Ti 0.8 Mo 0.2 )C-40Ni were almost same.

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Cermets: I, Fundamental Concepts Related to Micro‐structure and Physical Properties of Cermet Systems

Cited by 167 publications

References 2 publications

Review: liquid phase sintering

Review: liquid phase sintering

Growth Inhibition of Nano WC particles in WC-Co Alloys during Liquid-Phase Sintering

Effect of Ni Contents on Microstructures and Mechanical Properties for (Ti<sub>0.8</sub>Mo<sub>0.2</sub>)C-Ni Cermets

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