Amorphous Si O2(a-Si O2) films were synthesized on WC-Co substrates with H2 and tetraethoxysilane(TEOS) via pyrolysis of molecular precursor.X-ray diffraction(XRD) pattern shows that silicon-cobalt compounds for...Amorphous Si O2(a-Si O2) films were synthesized on WC-Co substrates with H2 and tetraethoxysilane(TEOS) via pyrolysis of molecular precursor.X-ray diffraction(XRD) pattern shows that silicon-cobalt compounds form at the interface between a-Si O2 films and WC-Co substrates.Moreover,it is observed by transmission electron microscope(TEM) that the a-Si O2 films are composed of hollow mirco-spheroid a-Si O2 particles.Subsequently,the a-Si O2 films are used as intermediate films and chemical vapor deposition(CVD) diamond films are deposited on them.Indentation tests were performed to evaluate the adhesion of bi-layer(a-Si O2 + diamond) films on cemented carbide substrates.And the cutting performance of bi-layer(a-Si O2 + diamond) coated inserts was evaluated by machining the glass fiber reinforced plastic(GFRP).The results show that a-Si O2 interlayers can greatly improve the adhesive strength of diamond films on cemented carbide inserts;furthermore,thickness of the a-Si O2 interlayers plays a significant role in their effectiveness on adhesion enhancement of diamond films.展开更多
基金Project(20130073110036)supported by the Research Fund for the Doctoral Program of Higher Education of China
文摘Amorphous Si O2(a-Si O2) films were synthesized on WC-Co substrates with H2 and tetraethoxysilane(TEOS) via pyrolysis of molecular precursor.X-ray diffraction(XRD) pattern shows that silicon-cobalt compounds form at the interface between a-Si O2 films and WC-Co substrates.Moreover,it is observed by transmission electron microscope(TEM) that the a-Si O2 films are composed of hollow mirco-spheroid a-Si O2 particles.Subsequently,the a-Si O2 films are used as intermediate films and chemical vapor deposition(CVD) diamond films are deposited on them.Indentation tests were performed to evaluate the adhesion of bi-layer(a-Si O2 + diamond) films on cemented carbide substrates.And the cutting performance of bi-layer(a-Si O2 + diamond) coated inserts was evaluated by machining the glass fiber reinforced plastic(GFRP).The results show that a-Si O2 interlayers can greatly improve the adhesive strength of diamond films on cemented carbide inserts;furthermore,thickness of the a-Si O2 interlayers plays a significant role in their effectiveness on adhesion enhancement of diamond films.