Microstructure and properties of composite WC-8(Co, Ni)
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2016
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INTERNATIONAL CONFERENCE ON DIFFUSION IN SOLIDS AND LIQUIDS, 12th
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The WC-based cemented carbides, also called hard metals, are a family of composite materials consisting
of carbide ceramic particles embedded in a metallic binder. They are classified as metal matrix composites
(MMCs) because the metallic binder is the matrix that holds the bulk material together [1]. WC based
composites are used in applications where a good combination of hardness and toughness are necessary
[2]. It is usual to add more components as the tungsten carbide in a binder (Co, Ni) to build the
microstructure. The hardness for the cemented carbides based on nickel, because of the addition of
reinforcements SiC nano-whisker increases significantly [3]. In this work, the SiC was researched as an
additional component for composite WC-8(Co, Ni). Four mixtures were prepared with SiC content ranging
from 0 to 3.0 wt%. These mixtures were pressed (200 MPa) and green samples with 25.2 mm of diameter
and 40g were produced. Sintered were carried out in Sinter-HIP furnace (20 bar). Two sintering cycles were
investigated with 1380 and 1420°C, and the sintering time considered was 60 minutes. The relative density,
hardness, linear and volumetric shrinkage were determined. Microstructural evaluation was performed by
optical microscopy and scanning electron microscopy (SEM-FEG). The results showed that the addition of
SiC promoted higher densification and grain growth. The hardness was higher for samples with SiC, so solid
solution hardening of the binder was more effective than WC grain growth.
Como referenciar
MIRANDA, F.; RODRIGUES, D.; NAKAMATO, F.Y.; FRAJUCA, C.; SANTOS, G.A.; COUTO, A.A. Microstructure and properties of composite WC-8(Co, Ni): effect of the addition of SiC. In: INTERNATIONAL CONFERENCE ON DIFFUSION IN SOLIDS AND LIQUIDS, 12th, June 26-30, 2016, Split, Croatia. Abstract... p. 99-100. Disponível em: http://repositorio.ipen.br/handle/123456789/31245. Acesso em: 18 Apr 2024.
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