Diamond film growth in low pressure premixed ethylene-oxygen flames

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Abstract
A study of diamond film synthesis in low pressure premixed ethylene-oxygen flames is described. Experiments are performed in a low pressure flat-flame facility that has been employed previously to study diamond synthesis in premixed acetylene-oxygen flames. High film quality and uniformity are observed for substrate temperatures of approximately 700 °C and flame equivalence ratios of 2.41. There exists a distinct range in flame equivalence ratios for high quality diamond deposition that is comparable to that seen in acetylene-oxygen mixtures. The measured diamond growth rates are approximately one-quarter of that observed for acetylene-oxygen flames. However, when factoring in differences in the operating conditions, carbon utilization is approximately one-half of that observed for premixed acetylene-oxygen flames.