Ceramic 재질을 이용한 자동차용 대형 디젤엔진 Valve Lifter 연구 II. 사출성형에 의한 탄화규소질 Valve Lifter 개발

Studies of Valve Lifer for Automotive Heavy Duty Diesel Engine by Ceramic Materials II. Development of SiC Valve Lifter by Injection Molding Method

  • 윤호욱 (KIA-ASIA MOTORS 기술연구소) ;
  • 한인섭 (한국에너지 기술연구소) ;
  • 임연수 (명지대학교 공과대학 무기재료공학과) ;
  • 정윤중 (명지대학교공과대학 무기재료공학과)
  • 발행 : 1998.02.01

초록

Valve lifter namely tappet is supported by lifter hole which is located upper side of camshaft in cylinder block transforms rotatic mvement of camshaft into linear movement and helps to open and shut the en-gine valve as an engine parts. The face of valve lifter which is continuously contacting with camshaft brings about abnormal wears such as unfair wear and early wear because it is severely loaded in the valve train system. These wears act as a defect like over-clearance and cause imperfect combustion of fuel during the valve lifting in the combustion chamber. Consequently this imperfect combustion makes the engine out-put decrease and has cause on air pollution. To prevent these wears therefore The valve lifter cast in me-tal developed into SiC ceramics valve lifter which has an excellence in wear and impact resistance As a results the optimum process conditions like injection condition mixture ratio and debonding process could be established. After sintering fine-sinered dual microstructure in which prior ${\alpha}$-SiC matches well with new SiC(${\beta}$-SiC) produced by reaction among the ${\alpha}$-SiC carbon and silicon was obtained. Based on the study it is verified that mechanical properties of SiC valve lifter are excellent in Vickers hardness 1100-1200 bending strength (300-350 Pa) fracture toughness(1.5-1.7 Mpa$.$m1/2) Through engine dynamo test-ing SiC valve lifter and metal valve lifter are examined and compared into abnormal phenomena such as early fracture unfair and early wear. It is hoped that this research will serve as an important springboard for the future study of heavy duty diesel engine parts developed by ceramics which has a good wear resis-tance relaibility and lightability.

키워드

참고문헌

  1. SAE. 831048 Stress and Strength Prediction of Diesel Engine Cylinder Head Y. Nizue;H. Satoh;S. Umetani
  2. SAE. 850360 Cylinder Stress Phenomena in Engine Combusion Chamber T. Morel;R. Keribar;P.N. Blumberg
  3. Am. Ceram. Soc. Bull. v.64 Ceramic Technology for Advanced Heat Engines Project D.R. Johnson;A.C. Schafahauser;V.J. Tennery;E.L. Long, Jr.;R.B. Schulz
  4. Chem. Eng. Prog. Symp. Series v.80 Dispersed Ceramic Fuels for the Advanced Gas-Cooled Reactor J.V. Shennan
  5. Proc. Brit. Ceram. Soc. v.22 An Assisment of the Performence of REFFL Silicon Crabide under conditions of Thermal Stress P. Kennedy;J.V. Shennan;P. Braiden;J. McLaren;R. Davidge
  6. Proc. Brit. Ceram. Soc. v.22 Ceramics with Potential for Gas Turbine Application C.R. Gostelow;J.E. Restal
  7. U.S. Pat 492 767 Production of Artificial Crytaline Carbonaceous Materials E.G. Acheson
  8. Interceram v.4 Low Pressure Molding of Ceramic Materials I. Peltsman;M. Peltsman
  9. Advances in Powder Technology v.3 Requirments of Binders for Powder InjectionMolding C.I. Chung;B.O. Rhee;M.Y. Cao;C.X. Liu
  10. Int. J. High Technology Ceramics v.2 no.1 Review:Fabrication of Engineering Ceramics by Injection Molding. I. Materials Selection M.J. Edirisinghe;F.R.G. Evans
  11. Metal powder Industries Fabrication Powder Injection Molding R.M. German
  12. Ceramic Powders Rate-Controlled Extraction Unit for Removal of organic Binders from Injection-Molded Ceramics A. Johnson;E. Calstrom;L. Hermansson;R. Callsson;P. Vincenzini(ed.)
  13. Am. Ceram. Soc. Bull. v.68 no.2 Reaction-Based Processing Methods for Ceramic-Matrix Y.M. Chiang;J.S. Haggerty;R.P. Messner;C. Denety
  14. Ceram. Eng. Sci. Proc. v.11 no.7-8 Reaction-Based Processing Methods for Ceramics and composites Y.M. Chiang;J.S. Haggerty
  15. Am. Ceram. Soc. Bull. v.67 no.2 Reaction-Formed Ceramics M.Z. Washburnm;W.S. Coblenz
  16. Ceram. Eng. Sci. Proc. v.87-88 Preperation of Lanxide Ceramics Matrix Composites Matrix Formation by the Directed Oxidation of Molten Method M.S. Newkirk;H.D. Lesher;D.R. White;C.R. Kennedy;A.W. Urguhart;R. D. Claar
  17. Am. Ceram. Eng. Soc. Bull. v.67 no.2 Synthesis of High Temperature Material by Self-Propagating Combustion Method Z.A. Munir
  18. Am. Soc. Bull. v.72 no.12 The Economics of Advanced Self-Propagation, High-Temperature Synthesis Materials Fabrication K.A. Golubjatnikov;G.C. Stangle;R.M.Spriggs
  19. Special Ceramics The Preparation of Dense Self-Bonded Silicon Carbide P. Popper;P. Popper(ed.)
  20. Ceram. Eng. Sci. Proc. v.3 Injection Molding Ceramics J.A. Mangels
  21. J. Appl. Poly Sci. v.15 Flow of Viscous Fluid through a Circular Pipe J.S. Chung;E.B. Christiansen;A.D. Baer