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利用改进热丝化学气相沉积系统在(WC-Co)硬质合金牙钻切刃上沉积粘着性金刚石薄膜。试验发现,原生薄膜通常为聚晶,且薄膜覆盖效果良好。利用显微拉曼光谱表征了牙钻尖端、牙钻中部和牙钻末端等3个位置的应力分布。经计算,牙钻背部、中部和尖端的压应力分别为-1.7GPa、-2.3GPa和-3.4GPa。经双色光测高温计测量发现,热丝温度是沿热丝螺旋方向变化的。螺旋热丝中心区的温度比热丝边缘高。牙钻尖端刃口的温度比牙钻中部和背部都高。切削齿距热丝较近,可望处在稍高的温度。因此,沉积在切削齿刃口上的涂层比平板状牙钻基材厚。
Adhesive diamond films were deposited on (WC-Co) hardmetal dental drill cutting edges using an improved hot filament CVD system. The test found that the native film is usually polycrystalline, and the film coverage effect is good. The stress distribution in 3 locations of dental drill tip, middle dental drill and drill end was characterized by Raman microscopy. The back compressions at the back, center and tip of the drill were calculated to be -1.7 GPa, -2.3 GPa and -3.4 GPa, respectively. Measured by two-color photometer pyrometer found that the hot wire temperature is along the spiral direction of hot wire changes. Spiral hot wire central area hot wire edge temperature higher. The temperature at the tip of a toothbrush is higher than the center and back of a toothbrush. Cutting teeth hot wire closer, is expected to be at a slightly higher temperature. Therefore, the coating deposited on the cutting edge is thicker than the flat dental drill base.