Processing and Friction Properties of Intermetallic-Bonded Diamond Ceramtc Composites

Wittmer, Dale E.; Picard, Sarah; Miller, T. N.; Pejcochova, Petra; Filip, Peter

doi:10.1002/9780470291313.ch65

Cited by 1 publication

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“…The thermal stability of the diamond decreases in the presence of a liquid phase 36 . The dissolution and redeposition of diamond in the liquid phase accelerate its graphitization 37 . The resistance heating and pressure sintering enable rapid temperature rise and short‐time sintering, which inhibits the transformation of diamond to graphite kinetically.…”

Section: Resultsmentioning

confidence: 99%

“…36 The dissolution and redeposition of diamond in the liquid phase accelerate its graphitization. 37 The resistance heating and pressure sintering enable rapid temperature rise and short-time sintering, which inhibits the transformation of diamond to graphite kinetically. As a result, the presence of graphite in this composite significantly reduces its sinterability and mechanical properties.…”

Section: Thermal Stability Of the Diamondmentioning

confidence: 99%

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Effect of diamond volume fraction on the microstructure and mechanical properties of SPS WC–Co/diamond composites

Pirmohammadi,

Zakeri,

Razavi

et al. 2023

Int J Applied Ceramic Tech

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In this research, the effect of the volume percentage of diamond additive on the sintering behavior, microstructure, and mechanical properties of WC–Co was investigated. WC–Co/diamond composites with different percentages of 0%, 2.5%, 5%, 7.5%, and 10% by volume of diamond were made by spark plasma sintering at 1300°C and 40 MPa for 5 min. A small amount of phase transformation from the diamond phase to the graphite phase was observed. The amount of graphitization was low due to low temperature and short sintering time. The addition of diamond leads to a significant enhancement in both the hardness and fracture toughness of the composites, overcoming the trade‐off between hardness and toughness typically observed in WC‐based materials. The sample reinforced with 5% by volume of diamond showed simultaneously the highest hardness (22.9 GPa), the highest fracture toughness (22.7 MPa m1/2), and the highest flexural strength (1896 MPa). The uniform dispersion, good bonding of the superhard diamond phase with the matrix, and the fine microstructure caused the high hardness and toughness of composite. The main effective mechanisms in increasing the fracture toughness of the composite were crack deflection, bridging, and blocking of crack propagation by diamond particles.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Stability Of the Diamondmentioning

confidence: 99%