Development of Functionally Graded Sintered Hard Materials

Tsuda, Keiichi; Ikegaya, Akihiko; Isobe, Kazutaka; Kitagawa, Norie; Nomura, Tsuyoshi

doi:10.1179/pom.1996.39.4.296

Cited by 42 publications

(20 citation statements)

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“…These local defects, attributed to the existence of cracks, to incomplete bonding between particles, and to interconnected porosity create direct paths through which the corrosive medium can gain access to the substrate material. Nitridation is an alternative method for controlling the chemical composition and microstructure at the surface of the hardmetal in order to improve its wear resistance [24][25][26][27][28][29][30][31][32][33][34][35]. By nitriding Ti-containing hardmetals a Ti(C,N) binder-free surface can be formed.…”

Section: Introductionmentioning

confidence: 99%

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Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

Barbatti

Sket

García³

et al. 2006

Surface and Coatings Technology

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The effect of a nitridation surface treatment on the microstructure and corrosion resistance of Co and Ni-binder (W,Ti)C-based hardmetals with additions of (Ta,Nb)C was investigated. Nitridation treatment produces a surface layer with a higher hard phase (Ti,Ta,Nb,W)(C,N) content. The near-surface layer thickness and microstructure are affected by the choice of binder (Co respectively Ni). The corrosion resistance of the hardmetals was characterized using linear sweep voltammetry. The microstructure of the hardmetals was determined before and after corrosive attack by optical microscopy and SEM. The results of the corrosion tests and microstructure analyses are interpreted in terms of the correlation between the hardmetal morphology and porosity and ion transport through the interface binder-electrolyte. The nitridation treatment of the hardmetals strongly increases the resistance to aggressive corrosion media for hardmetals both with Co and Ni-binder phase and thus may positively influence the hardmetal lifetime in cutting applications in chemically aggressive environments.

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Section: Introductionmentioning

confidence: 99%

“…By nitriding Ti-containing hardmetals a Ti(C,N) binder-free surface can be formed. The enhanced hardness of this phase leads to tremendous improvements in the wear resistance and in cutting performance [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

Barbatti

Sket

García³

et al. 2006

Surface and Coatings Technology

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“…Sumitomo Electric Industries Ltd. developed FGM cemented carbide with improved wear resistance and long tool life [13]. In this example TiCN-WC-Co-Ni alloy is sintered under a controlled nitrogen atmosphere and cooling rate in order to yield a TiC -TiCN-WC graded microstructure with Co as a binder phase.…”

Section: Cutting Tools: Cemented Carbidesmentioning

confidence: 99%

Present status of research on design and processing of functionally graded materials

2003

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Recent activities in the research of functionally graded materials (FGMs) are reviewed with an emphasis on the fabrication techniques for graded microstructure and functions. The research activities have focused on the processing of graded structures that satisfy the designed functions. Several examples of practical applications of FGMs are described in the present paper to demonstrate the fabrication approaches typical to this kind of material. The remainder of the paper is devoted to summarizing a recently finished national project supported by the Ministry of Education of Japan. Research and developments with respect to FGMs in various fields including physics, chemistry, medical science, and biology are briefly reviewed.

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“…In this context, some authors have proposed the use of mixed Ti(C,N)-WC-Co materials, either developing a more refractory structure in the bulk [8] or providing a graded structure [9]. More encouraging results have been obtained with the so-called functionally graded cemented carbides, characterized by a compositional gradient from the surface to the inside of the material.…”

Section: Introductionmentioning

confidence: 99%

Processing and characterisation of cermet/hardmetal laminates with strong interfaces

et al. 2014

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Cemented carbides and cermets are potential materials for high speed machining tools.However, cemented carbides are not chemically stable at high temperature and cermets present poor fracture toughness. Novel cermet/hardmetal multilayer systems show a huge potential for this intended application. It would be possible to achieve the right balance of the required thermomechanical properties using cermet as temperature protective outer layers and hardmetal as reinforcement layers. In this work, preliminary results on the microstructural and mechanical characterisation of a multilayer TiC x N 1-xCo/WC-Co composite densified by hot pressing are presented, with special attention to the properties of the interface. Microstructural observations revealed the existence of strong bonding interfaces between cermet and hardmetal layers due to chemical interaction during the sintering process. As a consequence, owing to the different coefficient of thermal expansion between cermet and hardmetal, a tensile and compressive biaxial residual stress of σ res,Cermet ≈ +260±50 MPa and σ res,WC-Co ≈ -350±70 MPa was estimated in the corresponding layers. Microindentation cracks introduced in the cermet layers (the less toughness material) and propagated 2 transversely to the layers were arrested at the interface, showing the combined effect of toughness and compressive stresses on crack shielding.

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Development of Functionally Graded Sintered Hard Materials

Cited by 42 publications

References 0 publications

Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

Present status of research on design and processing of functionally graded materials

Processing and characterisation of cermet/hardmetal laminates with strong interfaces

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