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对钨钴类硬质合金基底表面进行预处理的目的是降低基底表面钴的含量,以便降低钴对沉积金刚石薄膜的不利影响。为了改善金刚石薄膜的生长环境,提高其与硬质合金基底的粘接强度,将经过清洗后的硬质合金基底浸泡在硼砂饱和溶液中,在沉积金刚石薄膜时,先用燃焰外焰的热量及其氧化性对带有硼砂饱和溶液的硬质合金基底表面进行预处理30～60s,然后再进行化学气相沉积金刚石薄膜。经上述方法处理的试样与未经该法处理的试样相对比,前者的金刚石薄膜生长速度明显较快,生长温度也比较低,试样对标准砂轮的磨耗比值较后者的提高20%以上,表明本实验方法提高了薄膜与基底的粘接强度。
The purpose of the pretreatment of the surface of the tungsten-cobalt-based cemented carbide substrate is to reduce the cobalt content of the substrate surface in order to reduce the adverse effect of cobalt on the deposited diamond film. In order to improve the growth environment of the diamond film and improve the bonding strength with the cemented carbide substrate, the cemented carbide substrate after cleaning is immersed in a saturated solution of borax. When the diamond film is deposited, the heat of the flame outside the flame And its oxidation of borax with a saturated solution of the cemented carbide substrate surface pretreatment 30 ~ 60s, and then the chemical vapor deposition of diamond film. The sample treated by the above method compared with the sample without the law, the former diamond film growth rate was significantly faster, the growth temperature is relatively low, the sample on the standard wear rate of the wheel than the latter by 20% The above shows that the experimental method improves the bonding strength between the film and the substrate.