By G. N. Dubinin (auth.), G. V. Samsonov (eds.)
One of the best tools of accelerating the wear and tear resistance, hardness, floor power and high-temperature oxidation resistance of metals and alloys is the diffusion satu ration of the surfaces by way of metals and nonmetals. For speaking and discussing the result of the various researches conducted during this box within the division of PJ:tysicotechnical difficulties of fabrics technological know-how, Academy of Sciences of the UkrSSR, an enduring clinical Seminar was once arrange in 1961, which enjoys an ever-increasing reputation between experts during this box. the current assortment comprises papers learn on the 3rd consultation of this Seminar, hung on September 25-28, 1963. The compilers of the gathering and the authors of the papers desire that its book within the U. S. A. will permit American experts to turn into conversant in the most traces alongside which corresponding paintings is being performed within the USSR. this could give a contribution to an ex swap of clinical event during this fascinating box that's of such nice functional impor tance. G. V. Samsonov PREFACE This assortment is produced from papers when it comes to the diffusion saturation of metals and to coatings of refractory compounds. The papers talk about present difficulties within the conception and perform of the construction of diffusion coatings on metal fabrics. a way of classifying the tools of diffusion saturation is proposed, and a brand new process is defined for calculating the diffusion parameters in a heterogeneous medium.
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Extra resources for Diffusion Cladding of Metals
000) cal/mole. iOOO) cal/mole. ,I o / / /' V The temperature dependence of the coefficients of diffusion of silicon in Mo 5Sia and MoSi 2 has the form: D~O,Si. 000) -T- , 8 Time. hr Fig. 10. Variation in thickness of MoSi2 layer with siliconizing time for a temperature of the specimen of 1200°C and cell temperature of 1250°C. Si -08 DMoSis'. exp (28,800 - -T-) . In the case of siliconizing of metals in a cell with a temperature gradient, the rate of siliconizing decreases with increase in VACUUM SILICONIZING OF REFRACTORY METALS 35 the temperature of the specimen, and increases with decrease in temperaure of the specimen in comparison with the cell temperature, while the variation of the growth of the layer with time, for a given temperature gradient, is described by a parabola.
Seventy nine pairs of specimens were tested with dry quartz sand and 16 pairs without sand. * Impact strength was determined by fracture of entire pins on an impact testing machine. 5-4 mm,andonpinswhichhadnotbeen heat treated. Several series of experiments were made, the total number of tested pairs being 53. Fig. 2. Diagram of apparatus for testing the wear of specimens: (1) Specimen from pin; (2) specimen from link lug. Tests with dry quartz sand were carried out for 4 hr. Wear of the parts was determined by weighing the specimens on an analytical balance after each hour of test.
Metal 21:579 (1957). BOROAlUMINIZING OF IRON AND STEEL G. V. Zemskov and N. G. Kaidash Diffusion boriding and aluminizing are widely used in practice for imparting special P:roperties to surface layers on iron and steel [2, 7]. Drawbacks of boride layers are their high brittleness and low heat resistance. Aluminizing increases the temperature resistance and corrosion resistance of iron alloys, but the diffusion layers have low hardness and wear resistance. The saturation of the surface of iron alloys with both these elements is of great theoretical and practical importance.