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Effect on oxides on surface topography and thermal contact resistance

By M. N. Mian

Abstract

The effect of oxides on the topographies of various random engineering surfaces and steady-state thermal contact resistances between oxidefree and oxidized metallic surfaces in contact in high vacua have been investigated. The results of many previous investigations indicated that such problems cannot be dealt with without a detailed study of the surface topographies, resulting in accurate surface characterisation. The distributions of the real micro-contact zones and heat transfer phenomena across interfaces could 'then be predicted. Cylindrical specimens normally mild steel EN3B and commercially pure copper of nominal area 4.908 x 10-4 m2 were oxidized under controlled environmental conditions and subsequently pressed into contact at their flat faces. The oxide film thickness measurements were taken using a high resolution Stereoscan electron microscope. Surface topographies were quantified before and after oxidation to determine the effects of oxide films upon their topological characteristics. Following a detailed analysis, two theories concerning the problem of predicting thermal contact resistances of oxidized joints having Gaussian distribution of surface heights have been developed. The developed theories establish the surface parameters measured to design a predictable thermal joint and apply for thin films of the order of naturally occurring oxides. From a statistical analysis of the experimental measurements for freshly-assembled contacts, an empirical expression (R = 66.0 p-0.945 a-0.128 X0.0346) has been established relating the loading pressure, mean roughness of'the contacting surfaces and oxide film thickness to the thermal resistance of the contacts in high vacua. Finally a method of producing joints with low thermal contact resistance (and vice versa) is suggested

Publisher: Cranfield University
Year: 1979
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/4287
Provided by: Cranfield CERES

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Citations

  1. A coefficient of friction which increases with increasing load. doi
  2. (1974). A high power communication satellite DAVISON, doi
  3. (1968). A reflectometer for the assessment of surface finish.
  4. (1964). Actual contact area between touching surfaces. Consultants Bureau Enterprises,
  5. Beitrag zur theorie des Anlaufrorgangs.
  6. Contact and rubbing of flat surfaces. doi
  7. (1959). Contact heat exchange in Turbine Parts (In Russian), Air Cooling of Gas Turbine Motors .
  8. (1964). Deformation of metals in static and sliding contact,
  9. (1969). Deformations of stacks of thin layers doi
  10. Description of methods for determining geometric parameters for surfaces in contact.
  11. (1937). Diffusion und Chemische Reakion in fasten Stoffen
  12. (1970). Effect of surface films on thermal contact conductance, Part I. Microscopic Experiments.
  13. Effect of surface roughness on the PENNINGTON, W. A. oxidation rate of iron. doi
  14. (1974). Effects of oxide films on thermal contact resistance. doi
  15. Electric contacts - Theory and application. doi
  16. (1927). Elektrostatik der leiter Handbuch der physik. doi
  17. (1973). Estimation of the number and the mean area of real contact points on the basis of surface profiles. doi
  18. (1952). Fifth International Congress for electron microscopy.
  19. (1964). Friction and lubrication of solids. Part 1. doi
  20. (1930). Handbook exp. physik,
  21. (1972). Handbook of wiring, cabling and interconnecting for electronics.
  22. Hardness of rough surfaces. doi
  23. Interface thermal contact resistance problems in space vehicles. doi
  24. (1964). Mechanical stresses during the LEISTIKOW, S., oxidation of copper, and their STADLER, A. influence on oxidation kinetics. doi
  25. Metallic interface thermal conductance. Thermal Conductivity Conference, doi
  26. (1967). Microtopography of surfaces. doi
  27. (1962). New corrosion resistant high temperature heat exchanger materials. doi
  28. (1970). of surface films on thermal contact conductance: Part 2. Macroscopic Experiments. Procs. of Space Technology and Heat Transfer Conference, ASMM,
  29. (1951). On the mechanism and kinetics of BIRCHENALL,
  30. (1962). Oxidation of metals. Second HOPKINS,
  31. (1967). Oxidation rate and oxide structural defects. Surfaces and Interfaces, 1-Chemical and Physical charactersitics.
  32. (1963). Prediction of the thermal doi
  33. Private communication Marchwood Engineering Laboratories,
  34. Real area of contact between a
  35. (1951). Reigne Angew Math.
  36. (1963). Relation between surface roughness and specular reflectance at normal incidence.
  37. (1961). Single contacts and multiple encounters.
  38. Solids in static contact. doi
  39. (1965). Some approaches to the measurement of waviness.
  40. Some factors influencing the areaload chracteristics for semi-smooth contiguous surfaces under static loading.
  41. (1971). Some observations on dilute iron MAXWELL, doi
  42. Specifying surface quality.
  43. Stress generation and relief in growing oxide films. doi
  44. (1965). Study of interface thermal contact conductance. Summary Rept.
  45. (1971). Surface preparation and finishes for metals.: A manual of the Society of Manufacturing Engineers.
  46. (1971). Surface topography program.
  47. Surface topography, effects in the estimation of thermal and electrical Contact resistance. doi
  48. (1964). The bearing parameters of surface topography.
  49. (1966). The contact of nominally flat surfaces. doi
  50. (1978). The effect of-surface configuration on thermal energy transfer, across pressed contacts.
  51. The initial stresses developed doi
  52. The kinetics of air oxidation of iron in the range 7000 -
  53. (1950). The mathematical theory of plasticity. doi
  54. (1973). The mechanical properties and
  55. (1957). The physics of electrical contacts. doi
  56. (1970). The properties of random surfaces of'significance in their contact.
  57. The thermal conductance of Uranium McINTOSH, doi
  58. (1970). The thermal contact resistance at
  59. Theorie der geordneten Tischphasen.
  60. (1965). Thermal and mechanical studies of solid-solid contact. Euratom report EUR 2486e,
  61. Thermal conductance of metallic surfaces doi
  62. Thermal conductivity. doi
  63. Thermal contact resistance in a doi
  64. Thermal contact resistance, doi
  65. Thermal contact resistance. doi
  66. (1948). Thermal resistance measurements on joints formed between stationary metal suraces. Paper presented at semi-annual meeting, ASME, Heat Transfer Division,
  67. (1965). Thermal resistance of pressed
  68. Thermal resistance of pressed contacts doi
  69. (1966). Thermal resistance of some
  70. (1977). Thermal resistance of stacks of doi

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