ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The thermal oxidation resistance of intermetallic compounds from the following groups of alloys has been tested by an isochronal method: (a) yttrium, lanthanum, cerium, gadolinium, titanium and zirconium separately with the series of elements chromium to gallium, (b) titanium with the elements palladium, silver, cadmium, platinum and gold and (c) some miscellaneous compounds marginal to (a) and (b). The ratio of the oxidation parameter to the decomposition point (T p/T m) has been plotted on appropriate synoptic diagrams, from which it is evident that maxima inT p/T m occur at Ni (group III)3 or Ni (group IV)2. Extensions of highT p/Tmstretch in two directions in the diagrams from the maxima, namely NiR3 → Fe2R and NiR3 → CuR, from which it is inferred that these maxima and extensions, which are indicative of a considerable degree of chemical binding, are related to bonding across the transition metal and composite divides respectively. Substitution of palladium or platinum for nickel, or of zirconium for titanium, results in diminution inT p/T m, and this is thought to be due to the operation of a supplementary valency effect.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01107454
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