高純度アセチレン燃焼炎による合成ダイヤモンド皮膜の接合強度に及ぼす窒素添加流量の影響

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Diamond films have been synthesized by flame combustion using a mixture of high-purity acetylene and oxygen gas. To obtain good quality diamond films and to achieve good adhesion, diamond films were synthesized by stable flame combustion using the mixture of high-purity acetylene and oxygen gas with nitrogen gas added as the diamond promotion agent; nitrogen flow rate was carefully varied. In previous study, the optimal nitrogen flow rate was 0.500 cm3/s, and good quality diamond films were synthesized. In this study, to investigate effects of nitrogen addition flow rate on the bonding strength of synthesized films, the scratch test by indenter of Rockwell to synthesized delamination-free diamond films was performed, and the bonding strength was discussed. In results, the bonding strength was increased with increasing the nitrogen flow rate from the nitrogen flow rate 0.000 cm3/s, and it was concluded that diamond films synthesized by nitrogen flow rate 0.500 cm3/s had the highest bonding strength. And, the bonding strength was decreased with increasing the nitrogen flow rate from the nitrogen flow rate 0.500 cm3/s. The bonding strength of synthesized diamond films was changed by varying the nitrogen flow rate. Thus, nitrogen addition to high-purity acetylene affects bonding strength. The reason for this is that the nitrogen affects the crystallite morphology of synthesized diamond films. The nitrogen flow rate 0.500 cm3/s is good condition for the bonding strength.
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高純度アセチレン燃焼炎による合成ダイヤモンド皮膜の接合強度に及ぼす窒素添加流量の影響

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