Influence Of Surface Oxidation Research Articles

The influence of surface oxides on photocurrents at anthracene electrodes

The influence of surface oxides on photocurrents at anthracene electrodes

Influence of surface oxidation on the elastic aftereffect of microfoils of different alloys

1. The surface state of the initial surface has a great effect on the elastic aftereffect of microfoils made of magnesium bronze Br. Mg 0.8. The elastic aftereffect in microfoils made of wires with oxidized surfaces is several times higher than foils made from wires from which the oxide layer has been removed. 2. The presence of oxide layers formed during heat treatment on the surface of Br. OTs 4-3 and MR47-VP microfoils considerably increases the elastic aftereffect; this increase is 15–20 times for Mr47-VP and 30–40% for Br. OTs 4-3. 3. The oxidation of the surface of microfoils of Br. Mg 0.8 magnesium bronze and of the K40NKhMV alloy during heat treatment does not change their elastic aftereffect. 4. In microfoils of all the alloys investigated the magnitude of the elastic aftereffect does not change after the foils are kept in the corrosive medium.

Paper 15: A Consideration of Factors Affecting the Wear Resistance of Materials Used in Aircraft Gas-Turbine Engines

Despite the increasing need for engineering materials to be wear-resistant, wear has usually been considered only after all other design factors, and frequently not at all. This is undesirable and all locating surfaces should be regarded with suspicion at the design stage, particularly with a view to lessening and facilitating repairs. Some effects on wear, of load and movement, vibration, temperature, and material are discussed and the undesirability of rattling loads emphasized. The influence of surface oxides is discussed and the results of some other investigators related to practical experience of flight engine components. A rubbing test and a hammer test are described and from their results and the observations of two other authors, it is suggested that all the more wear resistant materials rely upon the formation of a Buckley and Johnson surface ‘glaze’ whose characteristics are dependent upon the base material composition. It is further suggested that such materials will exhibit an impact limit beyond which the glaze will have a limited ability to survive, suggesting that the most promising line of approach to wear resistance is in the field of complex oxides.