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 Composite spherical powders made of aluminium and yttria were prepared by the mechanical shock method. This unique idea for composite powder products, without the use of heat, and making use of the ductility of the metal and the brittleness of ceramics, has a preparation time of only 3 min. For analysis of the cross-sections of an Al-Y2O3 composite particle, electron probe microanalysis was used. In the composite particle, a diffused layer is formed at the interface between Al and Y2O3; and the boundary between these components is thought to be quite strong. These composite spherical powders are excellent regarding fluidity and their spray capability. The Al-Y3O3 composite powder was initially plasma sprayed on to an aluminium alloy substrate, and then coated with partially stabilized zirconia. The tensile strength of these test pieces was studied as a function of compositional changes in the Al-Y2O3 system. For 0.2 to 1 mol% Y2O3, the tensile strength is much higher, values up to 75.5 M Pa being attainable. The heat-cycle number of test pieces with the above composition range at the present time has been measured at over 2000.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00582499
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