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      https://www.ias.ac.in/article/fulltext/boms/033/03/0251-0255

    • Keywords

       

      Hot filament CVD; polycrystalline diamond coating; roughness; morphology; quality.

    • Abstract

       

      Polycrystalline diamond coatings are grown on Si (100) substrate by hot filament CVD technique. We investigate here the effect of substrate roughening on the substrate temperature and methane concentration required to maintain high quality, high growth rate and faceted morphology of the diamond coatings. It has been shown that as we increase the substrate roughness from 0.05 𝜇m to 0.91 𝜇m (centre line average or CLA) there is enhancement in deposited film quality (Raman peak intensity ratio of 𝑠𝑝3 to non-𝑠𝑝3 content increases from 1.65 to 7.13) and the substrate temperature can be brought down to 640°C without any additional substrate heating. The coatings grown at adverse conditions for 𝑠𝑝3 deposition has cauliflower morphology with nanocrystalline grains and coatings grown under favourable 𝑠𝑝3 condition gives clear faceted grains.

    • Author Affiliations

       

      Awadesh K Mallik1 2 S R Binu1 3 L N Satapathy1 4 Chandrabhas Narayana1 5 Md Motin Seikh1 6 S A Shivashankar1 2 S K Biswas1 2 3

      1. Central Glass and Ceramic Research Institute, Kolkata 700 032, India
      2. Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India
      3. Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India
      4. Ceramic Technological Institute, Bharat Heavy Electricals Limited, Bangalore 560 012, India
      5. Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
      6. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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