Barely Significant

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The friction coefficient showed a trend of decreasing first and then increasing with the increase in some surface topography parameters at lower pressure, such as the surface height arithmetic mean Sa , surface height distribution kurtosis Sku , surface volume average volume Vvv , and surface center area average void volume Vvc , which are the ISO 25178 international standard parameters.
As shown in Figure 8 , with the heating rate increasing from 0 to 20 °C/min, the apparent porosity possesses an increasing trend; however, when the heating rate further increases to 30 °C/min, it decreases slightly because of the pores’ shrinkage caused by the hydration of the matrix surrounding the pores [ 35 , 40 ].