Contrasting roles of speed on wear of soda lime silica glass in dry and humid air

Atomistic understanding of surface wear process of sodium silicate glass in dry versus humid environments

“…17 For this reason, a quantitative comparison with experimental wear volumes may not be feasible within the scalability of our simulations; nonetheless, the overall qualitative trends are quite comparable to each other. 12,32 This agreement with experiment validates that ReaxFF-MD simulation results for the sodium silicate of this study can provide an insight into the role of interfacial water in wear reduction of SLS at high humidity conditions. It should be noted that the experimental conditions of contact load and sliding speed are different from MD simulations, especially simulation sliding speed being several orders of magnitude higher due to the computational limitations.…”

“…In simulations, the local wear track cannot be defined because the slab‐on‐slab geometry and periodic boundary conditions are used; instead, the wear amount is calculated based on the atomic mixing during the sliding and transfer from one surface to the other after the vertical separation of two surfaces . For this reason, a quantitative comparison with experimental wear volumes may not be feasible within the scalability of our simulations; nonetheless, the overall qualitative trends are quite comparable to each other . This agreement with experiment validates that ReaxFF‐MD simulation results for the sodium silicate of this study can provide an insight into the role of interfacial water in wear reduction of SLS at high humidity conditions.…”

Synergy between surface mechanochemistry and subsurface dissolution on wear of soda lime silica glass in basic solution

“…Previously, it was reported that with the presence of water, the water-induced mechanochemical wear of SLS glass surface can decrease with increasing the sliding speed in humid air. 12 This result suggested that the lower sliding contact time at the higher sliding speed can suppress mechanochemical reactions at the sliding interface under the same total sliding cycle or distance conditions. In addition, any enhancement in wear volume in higher pH solutions must be associated with the presence of OH − ions in the solution.…”

“…[8][9][10][11] In contrast, the wear behavior in humid air is governed by mechanochemical reactions involving water molecules adsorbed from the gas phase; thus, it becomes a function of relative humidity (RH), [6][7][8][9] counter-surface chemistry, 8,9 and sliding speed. 12 In addition, the thermal history of glass also affects the wear behavior because it alters the glass structure. 13 Interestingly, the SLS glass is found to become more resistant to wear as RH increases to 90%, 8,9 which is different from other glass substrates, such as fused quartz, borosilicate glass, aluminosilicate glass, which show an increase in wear volume with increasing RH.…”

“…In the reciprocating tribo‐tests with a Pyrex glass sphere as a counter‐surface, the wear of SLS glass is dominated by the mechanical abrasion in the absence of water (RH = 0%) 8‐11 . In contrast, the wear behavior in humid air is governed by mechanochemical reactions involving water molecules adsorbed from the gas phase; thus, it becomes a function of relative humidity (RH), 6‐9 counter‐surface chemistry, 8,9 and sliding speed 12 . In addition, the thermal history of glass also affects the wear behavior because it alters the glass structure 13 .…”