Download Coatings of High - Temperature Materials by G. V. Samsonov, A. P. Epik (auth.), Henry H. Hausner (eds.) PDF

By G. V. Samsonov, A. P. Epik (auth.), Henry H. Hausner (eds.)

The houses of fabrics rely on the features of the majority and on these of the surf ace. Any switch in floor features impacts a wide selection of fabric houses. over the past few years the function of floor phenomena in metallurgy has been the topic of many stories. floor power, floor rigidity, the job of surfaces, and similar difficulties are less than dialogue within the western international * in addition to within the jap global. t The relation among quantity and floor houses in metals and alloys has been investigated and remains to be below research. fabrics are often uncovered to environments which switch their actual and chemical features as a result of a response happening among the fabric floor and the surroundings. The technological know-how and expertise of floor instruction ro increase fabric houses have received significance over the past decade in lots of components of the area. major efforts were targeted in particular at the coating of fabric surfaces in reference to the publicity of those fabrics to house en­ vironment.

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Comparative tests on the wear resistance of specimens chromium -plated only, and chromium-plating followed by carburizing, showed that the latter had considerably better properties. 11o C, after 100,000 revolutions had a loss in weight of about 50 mg, and fine, annular scratches were left on its surface. 4 mg and traces of abrasion were absent. A specimen, carburized at a temperature of 1050°C for 8 hr, after 10 cycles (1,000,000 revolutions) suffered no loss in weight and showed no traces of abrasion.

1) Nitrogen cylinder; 2} argon cylinder; 3) bubbler; 4) Tishchenko bottle containing asbestos fibers saturated with sodium hydroxide; 5) furnace with copper turnings; 6) potentiometer; 7) fumace with titanium tumings; 8) vessel with aluminum; 9) vessel with CaCl2; 10) working fumace; 11) bubbler; 12) specimens. 47 Nitrogen content of argon mixture . 0/0 Fig. 21. Depth of nitrided Iayer of an iodide titanium specimen as a function of the nitrogen content in the argon mixture (850°C, 4 hr). 5%. This nitride skin prevents the diffusion of nitrogen into the body of the metal, and at the same time diminishes the thickness of the total saturated surface layer.

04 . 10- 3 . 44 · 10- 2 . 55 . 103 . 00~ -YJ T) . ( 41 ,500) Table 11 shows how the thickness of the diffusion layers depends on the carburizing conditions. Using the method described in [24, 34], the diffusion constants were calculated, and the temperature relationships of the coefficients of diffusion of carbon in the in vestigated metals were determined (Table 12). Comparison of the data of Tables 9 and 12 shows that the values of the activation energy for the diffusion of carbon in the transition metals are higher than the corresponding values for the diffusion of boron in the same metals.

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