Mallik, Awadesh Kumar and Pal, Kalyan Sundar and Dandapat, Nandadulal and Guha, Bichitra Kumar and Datta, Someswar and Basu, Debabrata (2012) Influence of the microwave plasma CVD reactor parameters on substrate thermal management for growing large area diamond coatings inside a 915 MHz and moderately low power unit. Diamond and Related Materials, 30. pp. 53-61. ISSN 0925-9635

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The tuning (optimization) of the reactor parameters is very important in order to achieve spatial temperature uniformity across the large area substrate for growing high quality and uniformly thick diamond coatings. It is also important to minimize the thermal stress, arising from temperature non-uniformity, for producing crack free large area diamond coatings. So by varying different process parameters, such as chamber pressure, microwave power, gas flow rate and cavity lengths (by changing the probe, short and stage positions), the resultant variation of substrate surface temperature can be measured. By tuning these parameters the geometry as well as the density of the plasma discharge which directly influences substrate surface temperature may be controlled. It has been shown that by suitable manipulation of the reactor parameters one could achieve at best 80 degrees C variation in temperature uniformity over 100 mm diameter, which indeed has resulted in a very uniformly thick (+/- 12.8%) high quality polycrystalline diamond (PCD) coating. (c) 2012 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 915 MHz CVD reactor; Processing parameters; Substrate temperature uniformity; Polycrystalline diamond
Subjects: Engineering Materials
Divisions: Bioceramics & Coating
Depositing User: Bidhan Chaudhuri
Date Deposited: 17 Jan 2013 11:09
Last Modified: 17 Jan 2013 11:09

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