Selection and qualification of materials for relative motion and electrical isolation in a vacuum environment

Experimental study of the speed-dependence tribotechnical characteristics of some plasma-sprayed oxide coatings at elevated temperatures

“…The sought after linear wear rate was determined conventionally from the expression (4) where L is sliding distance of the sample or counter body. The test conditions are given in Table 3.…”

“…The operation of electrical insulation coatings (EICs) in already built thermonuclear energy reactors (TERs) of the Tokomak type (Jet, TFTR, JT 60U) and ITER under construction showed that, along with electrical insulation properties, EICs should have high tribomechanical characteristics [1][2][3][4][5][6][7][8][9]. One should consider the following specific conditions of functioning of EIC in ITER of the previous genera tions of TER: elevated static/dynamic compressing loads, tangential tensile stresses, and wear during the duration of functioning of the reactor.…”

“…The results of studying the tribotechnical charac teristics of previously prepared thermally sprayed ceramic oxide coatings (Al 2 O 3 , MgAl 2 O 4 ) indicate that they have no antifriction properties (coefficient of friction μ = 0.45-0.98) and, in some cases, are char acterized by low wear resistance [4,10,11] due to their dependence on many factors, in particular the spray ing method, fractional and chemical composition of powders, technological spraying conditions, etc.…”