scholarly journals Crystalline chromium doped aluminum oxide (ruby) use as a luminescent screen for proton beams

2003 ◽  
Author(s):  
K.A. Brown ◽  
D.M. Gassner
Keyword(s):  
Aluminum Oxide ◽  
Proton Beams ◽  
Luminescent Screen

Structure and properties of gas-dynamic coatings and evaluation of their use in sliding friction pairs

2020 ◽  
pp. 260-266
Author(s):  
V.E. Arkhipov ◽  
T.I. Murav’eva ◽  
M.S. Pugachev ◽  
O.O. Shcherbakova
Keyword(s):  
Aluminum Oxide ◽  
Sliding Friction ◽  
Metal Layer ◽  
Structural Phase ◽  
Mechanical Mixture ◽  
Structural Factors ◽  
Coating Structure ◽  
Corundum Structure ◽  
Deposited Metal ◽  
Copper Zinc

The problems of changes in the coating structure depending on the composition of the sprayed mechanical mixture using copper particles and mixture of copper and zinc particles (" brass") and the effect of structural factors on the tribological properties of the deposited metal layer are considered. The results of X-ray structural, phase, chemical and durometric analyzes, as well as tribological testing of coatings are presented. It is found that structure with hardness of ≈102.7 HV is formed in the coating from mechanical mixture of particles of copper and aluminum oxide (corundum). Numerous pores are observed in the structure of the deposited metal layer, the main size of which does not exceed 2 μm. In the coating from mechanical mixture of particles copper, zinc and aluminum oxide (corundum), structure is formed based on copper with hardness of ≈106.5 HV, zinc — ≈49.7 HV, intermetallic compounds (γ- and ε-phases) — ≈168.7 HV, the mass fraction of which is 62.0, 7.9 and 24.2 %, respectively. Both coatings can be used in sliding friction pairs.

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