Friction force of smooth surfaces of SiO2–SiO2 as a function of residual pressure

A new type of wide-range vacuum sensor

“…10, that these values coincide with the result in Fig. 1 and 3 As it was demonstrated above and theoretically shown in [2, 10] the experimental results obtained at various residual pressures [4,5], temperatures [6], and relative humidity values [9] allow interconversion and can be expressed as a function of coverage coefficient (see Fig. 11).…”

“…1, 2. The experimental results [4,5] presented in Fig. 3 -5 are in good agreement with the results [2] of analysis implemented for the sample of the same surface geometry as used in [4].…”

“…Recalculation of empirical data published by different authors [3][4][5][6]9] into coordinates "friction coefficientresidual pressure" "friction coefficient -temperature", "friction coefficient -humidity" demonstrates the similarity of their empirical results to the theoretical values shown in coordinates "friction coefficient -coverage" (Fig. 1, 3).…”

“…The functional dependence of so called "dry friction" coefficient on the residual pressure in "vacuum" exists both for metal-metal friction pairs [10] and for dielectric-dielectric friction pairs [4,5]. The experiments show that the mentioned functional dependence exists in the case of ball bearing run in vacuum too [3].…”

“…German made sensors were used to obtain the earlier published results [5]: 1) DVR -VACUUMBRAND (10 5 -10 2 Pa); 2) CTR90, Leybold Co, (10 4 -10-0 Pa); 3) CTR91, Leybold Co, (10 2 -10-2 Pa), ion gauge (10 0_ 10-4 Pa); 4) Bayard-Alpert sensor. The previous experimental results [4] were obtained using Russian (USSR) made analogue sensors. The results show, that "dry" friction is a complex phenomenon.…”