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Study on Polycrystalline Diamond for Rock Drilling Application Utilizing Shock Consolidation Technique

Research Project

Project/Area Number07505018
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Material processing/treatments
Research InstitutionMaterials and Structures Laboratory, Tokyo Institute of Technology

Principal Investigator

SAWAOKA Akira  Tokyo Institute of Technology, Materials and Structures Laboratory, Professor, 応用セラミックス研究所, 教授 (40029468)

Co-Investigator(Kenkyū-buntansha) AKASHI Tamotu  Sumitomo Coal Mining Co.Ltd., Hokkaido R & D Center, Senior Researcher, 北海道技術研究所, 主任研究員
TAMURA Hideki  Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and, 大学院・総合理工学研究科, 助教授 (30188437)
Project Period (FY) 1995 – 1997
Project Status Completed(Fiscal Year 1997)
Budget Amount *help
¥14,100,000 (Direct Cost : ¥14,100,000)
Fiscal Year 1997 : ¥3,500,000 (Direct Cost : ¥3,500,000)
Fiscal Year 1996 : ¥10,600,000 (Direct Cost : ¥10,600,000)
KeywordsDiamond / Drilling bit / Shock consolidation / Dynamic compaction / Tungsten carbide / 掘削ドット
Research Abstract

This project has been conducted in Fy 1995-79 as a feasibility study for industrialization of polycrystalline diamond for rock drilling application utilizing shock consolidation technique. The rock drilling bit consists of tungsten carbide alloy body and polycrystalline diamond layr, which formed by shock wave consolidation processing. The most serious problem is crack generation in the diamond layr during shock processing. Number of macro and micro cracks generated in the daiamond layr were decreased drastically by addition of silicon to diamond powder. Suitable contents of silicon is 3-7% for rock drilling bit application. Results of this study is summarized as following ;
(1) Grain boundary between diamond particles in the compact was observed by high resolution electron microscope. Diamond particles are bonded with high dense from glassy carbon having Sp^3 chemical bond transformed from diamond. Very fine silicon carbide particles dispersed in the carbon layr.
(2) The above boundary layr in the diamond compact has a kind of nano composite structure and it is expected a kind of mechanical toughening effect.
(3) A few micron size coarse silicon carbide and graphite particles were observed in the diamond layr. these particles with comparatively large size deteriorate its mechanical property.Generation of both micron size particles is caused by lack of uniform mixing of silicon and diamond particles.
(4) A plasma silicon coating technique was applied to form homogeneous coating to diamond particles with 2-4 micron. However coarse silicon particles were formed during the coating process. Industrialization of this technology is realized by development of extreme uniform coating method of silicon to diamond particles.

Report

(4results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report

Research Products

(11results)

All Other

All Publications

  • [Publications] Kenjiro Yamada: "An in-situ Observation of Amorphization of Carbyne Particle under Electron-beam Irradiation" Carbon. 34. 1601-1602 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hideki Tamura: "Zirconium Boride and Yantalum Carbide Coatings Sprayed by Electrothermal Explosion of Powders" J.Thermal Spray Technology. 6. 463-468 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Masahiro Ohkoshi: "Effect of Silicon Addition on Shock Consolidation of Diamond powder and Microstructures in the Grain Boundaries" High pressure Science and Technology. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kenjiro Yamada: "An in-situ Observation of Amorphization of Carbyne Particle under Electron-beam Irradiation" Carbon. 34. 1601-1602 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hideki Tamura: "Zirconium Boride and Tantalum Carbide Coatings Sprayd by Electrothermal Explosion of Powders" J.Thermal Spray Technology. 6. 463-468 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Ohkoshi: "Effect of Silicon Addition on Shock Consolidation of Diamond Powder and Microstructures in the Grain Boundaries" High Pressure Science and Technology. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kenjiro Yamada: "An in-situ Observation of Amorphization of Carbyne Particle under Electron-beam Irradiation" Carbon. 34. 1601-1602 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hideki Tamura: "Zirconium Boride and Tantalum Carbide Coatings Sprayed by Electrothermal Explosion of Powders" J.Themal Spray Technology. 6. 463-468 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Masahiro,Ohkoshi: "Effect of Silicon Addition on Shock Consolidation of Diamond Powder and Microstructures in the Grain Boundaries" High Pressure Science and Technology. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kenjiro Yamada: "An in-situ observation of amorphization of carbyne psrticle under electron-beam irradiation" Carbon. 34. 1601-1602 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yasuhiro Tanabe: "Crater Formation of Carbon Materials by Impact of a High Volocity Sphere" Carbon. 11. 1547-1552 (1995)

    • Related Report
      1995 Annual Research Report

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Published : 1996-04-01   Modified : 2016-04-21  

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