cemented carbides from wc powders obtained by the

Microstructure and mechanical properties of WC–Co

Microstructure and WC size The microstructures of cemented carbides with different blending ratios of fine to coarse WC powders observed by FESEM are shown in Fig. 1.It can be seen that the morphology of WC particles without the addition of fine WC shows

Study on Microstructure and Mechanical Properties of WC

In this paper, WC-10Nisub3/subAl cemented carbides were prepared by the powder metallurgy method, and the effects of ball-milling powders with two different organic solvents on the microstructure and mechanical properties of cemented carbides were studied. We show that the oxygen in the organic

Frontiers

Ultrafine tungsten carbide (WC) powder refers to WC powders with a particle size between 100 and 500 nm. Researchers have improved the comprehensive properties of WC-based cemented carbides by preparing ultra-fine WC powders. Because of the preparation and application of nanoscale WC powders, ultrafine-grain cemented carbides with excellent hardness and wear resistance have been

High

2015/9/15In the present paper cemented carbides with different grain sizes produced with WC powders obtained by the self-propagating high-temperature synthesis (SHS) were examined. Morphology, particle size distribution and chemical composition and of the SHS-powders were studied in detail. Microstructures of a submicron grade with 5% Co made from the near-nano WC powder obtained

ICME guided development of cemented carbides with alternative binder systems

Abstract The development of alternative binder systems for tungsten carbide (WC) based cemented carbides has again become of relevance due to possible changes in EU regulations regarding the use of Cobalt (Co). A framework for the ICME (Integrated

International Journal of Refractory Metals Hard Materials

WC-Co-Re cemented carbide in comparison with that of a conventional WC-Co material obtained from the same grade of WC powder. As one can see in Fig.3, the microstructure of the WC-Co-Re cemented carbide is significantly finer than that of the

The enhancement of the microstructure and mechanical performances of ultrafine WC

Ultrafine WC-10Co cemented carbides with different Cr2(C,N) inhibitor contents and different-scaled WC powders were prepared by low-pressure sintering. Their influence on the microstructure and mechanical performances were investigated and expounded in this

Types Of Cemented Carbides Grades Engineering Essay

The grades of Cemented Carbides in this group contain WC and Co as the main elements, although small additions or trace levels of other elements are often added to optimize properties. They have the widest range of strength and toughness of all the Cemented Carbide types and this is in combination with excellent wear resistance.

High

In the present paper cemented carbides with different grain sizes produced with WC powders obtained by the self-propagating high-temperature synthesis (SHS) were examined. Morphology, particle size distribution and chemical composition and of the SHS-powders were studied in detail. Microstructures of a submicron grade with 5% Co made from the near-nano WC powder obtained by the SHS and a

Frontiers

Ultrafine tungsten carbide (WC) powder refers to WC powders with a particle size between 100 and 500 nm. Researchers have improved the comprehensive properties of WC-based cemented carbides by preparing ultra-fine WC powders. Because of the preparation and application of nanoscale WC powders, ultrafine-grain cemented carbides with excellent hardness and wear resistance have been

Powder Injection Moulding of Cemented Carbides : Feedstock

The WC and Co powders, used in this study, were supplied by Marshall Hard Metals Ltd., Sheffield, U.K. WC powder is denoted WC Powder A and powder of 94wt% WC and 6 wt% Co, produced by milling WC and Co powders together, is denoted Powder

Joining of cemented carbides to steel by laser beam welding

Cemented carbides today are most often joined to steel by mechanical clamping [3], brazing [4] or resistance welding [5]. Other welding methods are rarely used because of the challenges arising e.g. from thermal expansion coefficient and thermal conductivity

On the Solubility of Phases in Cemented Carbides

On the Solubility 01 Phases in Cemented Carbides The changas inthe identity and lattice parameters ofthe phases occurring insintered mixtures ofWC-Co-TaC and WC-Co-TiC-TaC, have been studied by x-ray diffraction, as afunction ofsintering time at the temperature o 1440C. Estimates ofthe amount ofWC

Effect of Cr3C2 and VC on the Mechanical and Structural

The effect of addition of metallic carbides Cr 3 C 2 and Cr 3 C 2 + VC on structure and mechanical properties of WC-10 wt% Co nanocomposites have been studied. After preparing and compacting of the powders under pressure of 200 MPa, the samples were sintered at temperatures of 1370 C, 1410 C and 1450 C for 1 hour.

Optimization of Processing Parameters for WC

Nine types of trace nano-CeO2-doped WC-11Co cemented carbides designed by orthogonal method were prepared. The variance analysis results show that the relative density increases with increasing sintering temperature in the range of 1400-1450 C; the hardness is highly dependent on grain size of WC which is closely related to the particle size of the initial WC powder and grain refinement

The Effect of Cr3C2 and TaC Additives on Microstructure,

Obviously the WC-Co cemented carbides obtained by the authors are characterized by a much higher hardness. For another comparison, Mahmoodan et al. 22 investigated conventionally sintered WC-10Co-xCr 3 C 2 (x = 0.3, 0.6, 1.0) cemented carbides and obtained a hardness not exceeding 1800 HV 30 but the fracture toughness exceed 23 MPam 1/2 .

Nanostructured tungsten carbide powders obtained through

Nanostructured tungsten carbide powders obtained through optimization of carbon sources and atmosphere compositions. Background: "Cemented Carbide" or "Hard metal" is one of the most successful composite materials used in engineering, due to its unique

Comparative studies of WC

The present work reports a comparative study of cemented carbides of compositions WC-6Co, WC-10Co, WC-20Co, WC-6Co-6Ni and WC-12Ni-6Co. The purpose was to study the powder metallurgical production process of these compositions starting from a commercial WC-6Co powder, obtaining the desired compositions by mass balance with pure Co and pure Ni powders.

Investigation on sintering principle of ultra

2019/10/4Ultra-fine WC-10Co cemented carbides have been prepared based on WC-6Co composite powder, using the vacuum sintering method. The effect of sintering temperature on morphology and properties of the WC-10Co cemented carbide has been studied.

Atomistic modeling of interfaces in WC

Special and general WC/WC grain boundaries in cemented carbides are studied using DFT. The special Sigma = 2 twist grain boundary, the most frequently observed grain boundary, is studied in detail using a Peierls-Nabarro model combining DFT with elasticity theory. is grain boundary is predicted to have a low energy of about 0.7 J/m2 and be free from Co segregation, in agreement with

Effects of TaC on microstructure and mechanical properties of coarse grained WC 9Co cemented carbides

Trans. Nonferrous Met. Soc. China 25(2015) 1194−1199 Effects of TaC on microstructure and mechanical properties of coarse grained WC−9Co cemented carbides Wei SU, Ye-xi SUN, Hai-lin YANG, Xian-qi ZHANG, Jian-ming RUAN Powder Metallurgy Research

Materials

In this paper, WC-10Ni3Al cemented carbides were prepared by the powder metallurgy method, and the effects of ball-milling powders with two different organic solvents on the microstructure and mechanical properties of cemented carbides were studied. We show that the oxygen in the organic solvent can be absorbed into the mixed powders by ball-milling when ethanol (CH3CH2OH) is used

CEMENTED CARBIDES – A SUCCESS STORY

Cemented carbides are produced by Powder Metallurgy (PM). The respective powders (WC, Co, but also other metallic carbides or carbonitrides as well as Fe and Ni) are at first ball milled or attritor milled to form a powder mix. Then, a part is formed by different

Cemented Carbide Tools

2017/1/1Percussive drilling bits for mining can be successfully produced with inserts made of WC-Co cemented carbides fabricated from WC powders manufactured by the SHS method [3,4]. A medium-coarse carbide grade with 6% Co made from the SHS WC powder has a homogeneous microstructure with no abnormally large WC grains and is characterized by high values of TRS, hardness, and

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