Role of tantalum in the TiC-WC-TaC-Co hard metals. I. Effect of tantalum concentration on the composition and properties of the carbide and cobalt phases in the TiC-WC-TaC-Co hard metals

1986 ◽  
Vol 25 (4) ◽  
pp. 327-331 ◽  
Author(s):  
P. F. Cheburaeva ◽  
I. N. Chaporova
Keyword(s):  
Hard Metals ◽  
Tantalum Concentration

Effects of Nano-Al2O3 Additions on Microstructures and Properties of WC-8Co Hard Metals

2010 ◽  
Vol 97-101 ◽  
pp. 1649-1652 ◽  
Author(s):  
Lan Sun ◽  
Ji Xiong ◽  
Zhi Xing Guo
Keyword(s):  
Mechanical Properties ◽  
Magnetic Properties ◽  
Coercive Force ◽  
Rupture Strength ◽  
Al2o3 Content ◽  
Al2o3 Nanoparticles ◽  
Magnetic Intensity ◽  
Hard Metals ◽  
Conventional Sintering

To investigate the role of nano-Al2O3, WC–Al2O3–8wt%Co hard metals was mixed with 0-1.2 wt% nano-Al2O3 and prepared by conventional sintering (CS) for 2 h at 1440°C to see whether the addition of Al2O3 could improve densification behaviour, the microstructure and mechanical properties of the samples. The results showed that the use of Al2O3 nanoparticles as dispersions could reduce the porosity of WC-Co alloy and decrease the relative density; it could also inhibit the growth of the grains of WC-Co hardmetal to enhance the hardness and transverse rupture strength of the alloy in a proper range. The influence of Al2O3 content on the magnetic properties including coercive force and saturated magnetic intensity of the WC–Al2O3–8wt%Co hardmetals manifested the additive of nano-Al2O3 have effect on the WC grain growth inhibition and the formation of decarbonization phase in the alloy.

scholarly journals Recent Advances in the Deposition of Diamond Coatings on Co-Cemented Tungsten Carbides

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
R. Polini ◽  
M. Barletta ◽  
G. Rubino ◽  
S. Vesco
Keyword(s):  
Chemical Vapour ◽  
Deposition Process ◽  
Tungsten Carbides ◽  
Diamond Coatings ◽  
Carbon Dissolution ◽  
Thermal Expansion Coefficients ◽  
Hard Metals ◽  
To Receive ◽  
And Diffusion

Co-cemented tungsten carbides, namely, hard metals are largely used to manufacture high wear resistant components in several manufacturing segments. Coating hard metals with superhard materials like diamond is of utmost interest as it can further extend their useful lifespan. The deposition of diamond coatings onto WC-Co can be extremely complicated as a result of poor adhesion. This can be essentially ascribed to (i) the mismatch in thermal expansion coefficients between diamond and WC-Co, at the typical high temperatures inside the chemical vapour deposition (CVD) chamber, generates large residual stresses at the interface; (ii) the role of surface Co inside the WC-Co matrix during diamond CVD, which promotes carbon dissolution and diffusion. The present investigation reviews the techniques by which Co-cemented tungsten carbides can be treated to make them prone to receive diamond coatings by CVD. Further, it proposes interesting ecofriendly and sustainable alternatives to further improve the diamond deposition process as well as the overall performance of the coated hard metals.

The indentation of hard metals: the role of residual stresses

1977 ◽  
Vol 12 (2) ◽  
pp. 215-218 ◽  
Author(s):  
C. J. Studman ◽  
J. E. Field
Keyword(s):  
Residual Stresses ◽  
Hard Metals

scholarly journals Role of tantalum concentration, processing temperature, and strain-rate on the mechanical behavior of copper-tantalum alloys

2021 ◽  
Vol 208 ◽  
pp. 116706
Author(s):  
S. Srinivasan ◽  
S. Sharma ◽  
S. Turnage ◽  
B.C. Hornbuckle ◽  
C. Kale ◽  
...  
Keyword(s):  
Strain Rate ◽  
Mechanical Behavior ◽  
Processing Temperature ◽  
Tantalum Concentration

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

Elaborating the role of reflection and individual differences in the study of folk-economic beliefs

2018 ◽  
Vol 41 ◽  
Author(s):  
Kevin Arceneaux
Keyword(s):  
Decision Making ◽  
Individual Differences ◽  
Cognitive Processes ◽  
Evolutionary History ◽  
Behavioral Responses ◽  
History Of ◽  
Economic Beliefs

AbstractIntuitions guide decision-making, and looking to the evolutionary history of humans illuminates why some behavioral responses are more intuitive than others. Yet a place remains for cognitive processes to second-guess intuitive responses – that is, to be reflective – and individual differences abound in automatic, intuitive processing as well.

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