abstract
Cubic boron nitride (cBN) is normally used as the hardest phase of composites, together with ceramic and/or metallic matrixes, to form PcBN (Polycrystalline cubic Boron Nitride) materials applied in machining and finishing operations. While high PcBN (70-90 vol% cBN) is only produced by HPHT (High Pressure High Temperature) techniques, low PcBN (40-70 vol% cBN) can also be consolidated by SPS (Spark Plasma Sintering) since higher volume of binders are present. In this work, a cBN micrometer powder is combined with TiCN and Ni to produce composites with hard matrix phases, predicted by the calculated phase diagram. The SPS technique is used for the thermal consolidation of different PcBN compositions with a varied content of Ni, up to 15 vol%. A structural and microstructural characterization of the PcBN composites was performed for different compositions and maximum SPS temperatures. © European Powder Metallurgy Association (EPMA)
subject category
Cubic boron nitride; Polycrystalline materials; Powder metallurgy; Spark plasma sintering; Titanium compounds; Finishing operation; Hard phase; High pressure high temperature; High temperature techniques; High volumes; Machining operations; Metallic matrices; Nitride materials; Polycrystalline; Spark-plasma-sintering; III-V semiconductors
authors
Mineiro R.; Rodrigues J.; Fernandes C.M.; Figueiredo D.; Ferrari B.; Sanchez-Herencia A.J.; Senos A.M.R.
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