Machinable calcium pyrophosphate glass-ceramics

Toshihiro Kasuga; Miwako Terada; Masayuki Nogami; Mitsuo Niinomi

doi:10.1557/JMR.2001.0107

Machinable calcium pyrophosphate glass-ceramics

Toshihiro Kasuga, Miwako Terada, Masayuki Nogami, Mitsuo Niinomi

Materials Development Division

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

Glass-ceramics containing a large amount of calcium pyrophosphate (β-Ca₂P₂O₇) crystal were prepared via crystallization and sintering; compacts of a calcium phosphate glass powders with a composition of 60CaO · 30P₂O₅ · 5TiO₂ · 5Na₂O (in mol%) were heated for 3-6 h at 850 °C in air. The compacts were densified by the viscous flow of the glassy phases during heating. The calcium phosphate glass-ceramics were found to show a bending strength of approximately 100 MPa, and they were easy to machine, as confirmed by a drilling test using a conventional carbide tool. The machinability is thought to arise from the microstructure consisting predominantly of the interlocking and platelike β-Ca₂P₂O₇ precipitated in the glass.

Original language	English
Pages (from-to)	876-880
Number of pages	5
Journal	Journal of Materials Research
Volume	16
Issue number	3
DOIs	https://doi.org/10.1557/JMR.2001.0107
Publication status	Published - 2001 Mar

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Machinable calcium pyrophosphate glass-ceramics",

abstract = "Glass-ceramics containing a large amount of calcium pyrophosphate (β-Ca2P2O7) crystal were prepared via crystallization and sintering; compacts of a calcium phosphate glass powders with a composition of 60CaO · 30P2O5 · 5TiO2 · 5Na2O (in mol%) were heated for 3-6 h at 850 °C in air. The compacts were densified by the viscous flow of the glassy phases during heating. The calcium phosphate glass-ceramics were found to show a bending strength of approximately 100 MPa, and they were easy to machine, as confirmed by a drilling test using a conventional carbide tool. The machinability is thought to arise from the microstructure consisting predominantly of the interlocking and platelike β-Ca2P2O7 precipitated in the glass.",

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AU - Kasuga, Toshihiro

AU - Terada, Miwako

AU - Nogami, Masayuki

AU - Niinomi, Mitsuo

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