Abstract: The diamond reinforced ceramic matrix composite with Na2O-B2O3-Al2O3-SiO2 low-temperature glass as basic binder was fired. The interface bonding strength, interface element distribution and interface chemical bonds were characterized by scanning electron microscopy, X-ray energy spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and mechanical property testing. The result indicates that the interface of Na2O-B2O3-Al2O3-SiO2 vitrified bond and diamond particle has high bonding strength. The flexural strength of sample fired at 790 ℃ reaches 77. 82 MPa. The elements of Si, B, Na and Zn diffuses at the interface position, but the element of Al does not diffuse significantly. The holding force of vitrified bond on diamond is improved by element diffusion. The C-O, C = O and C-B chemical bonds are formed at the interface between vitrified bond and diamond, the interface bonding is further enhanced by chemical bonds formation. In addition, the diamond particles in composite fired at 790 ℃ are well preserved, however, the signs of graphitization are shown while the diamond in composite fired at 850 ℃ .
Key words: diamond; Na2O-B2O3-Al2O3-SiO2 ; ceramic vitrified bond; composite material; microstructure; interface
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