Enhanced tribological properties of barium boroaluminosilicate glass by thermal poling

He, Hongtu; Yu, Jiaxin; Qian, Linmao; Pantano, Carlo G.; Kim, Seong H.

doi:10.1016/j.wear.2016.10.023

Cited by 7 publications

(9 citation statements)

References 36 publications

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“…Alkali ions in Borofloat33 are not leachable due to the presence of silica‐rich domains formed through micro‐phase separation in the glass . The trace amount of sodium ions in AF45 is not leachable since they are in the bulk; but, when they are pushed and accumulated as NBO/Na + pairs near the surface via thermal poling, they can induce a good wear resistance in high humidity . The Na + ions associated with the AlO 4 − sites in the network are not as leachable as the ones associated with NBOs …”

Section: Discussionmentioning

confidence: 99%

“…In a series of studies under such mechanochemical wear conditions, it was found that sodium calcium silicate (also called soda lime silica, SLS) exhibits a peculiar RH dependence of the mechanochemical wear . While pure silica (fused quartz), alkali borosilicate (Schott Borofloat ® 33), barium boroaluminosilicate (Schott AF45), sodium aluminosilicate (base glass of Corning Gorilla ® 2), and chemically strengthened aluminosilicate (Corning Gorilla ® Glass 2) all show an increase in wear volume as RH increases to >80%, SLS shows a substantial reduction in wear volume at RH >80% compared to the wear at lower RHs . Understanding the origin of the decreased wear of SLS at RH>80% may provide critical insights needed to design and produce SLS glass panels with a superior practical strength.…”

Section: Introductionmentioning

confidence: 99%

“…Among all the glasses whose wear behaviors have been tested, it is noted that only SLS has leachable Na + ions associated with the non‐bridging oxygen (Si–O − ; NBO) atoms in the glass network. This raises questions about the effects of Na + itself in the silicate network vs the structure and reactivity of adsorbed water which may vary with Na + leaching.…”

Section: Introductionmentioning

confidence: 99%

“…The accumulation of subsurface Na + ions would be accompanied by the production of NBO sites for charge compensations. The Na + ‐enriched AF45 glass surface also exhibits a good wear resistance at 90% RH …”

Section: Introductionmentioning

confidence: 99%

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Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na⁺/K⁺‐ion exchange effects

et al. 2018

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The effects of exchanging Na+ with K+ on the mechanical and mechanochemical properties of a soda lime silica (SLS) glass were investigated. It is known that replacing smaller modifier ions with bigger ions in the silicate glass network, at temperatures below the glass transition (Tg), produces a compressive stress in the subsurface region that enhances resistance to mechanical damages. This study found that when Na+ ions in SLS are exchanged with K+ ions at 400°C, the hardness, indentation fracture toughness, and crack initiation load of the surface are increased, which is consistent with the chemical strengthening effect. However, the resistance to mechanochemical wear in a near‐saturation humidity condition (relative humidity RH = 90%) is deteriorated. When K+ ions are exchanged back with Na+ ions at 350°C, the wear resistance in high humidity conditions is recovered. These results indicate that the improvement of mechanical properties under indentation normal to the surface is irrelevant with the resistance to mechanochemical wear under tangential shear at the surface. Based on the analysis of the surface chemical composition, silicate network structure, and hydrogen‐bonding interactions of hydrous species in the subsurface region, it is proposed that the leachable Na+ associated with non‐bridging oxygen and subsurface hydrous species in the silicate network play more important roles in the mechanochemical wear of SLS at high RH.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na⁺/K⁺‐ion exchange effects

et al. 2018

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“…In commercial applications, glass surface properties often represent a critical component of functionality and value, particularly in newer applications requiring highly‐engineered technical glass compositions. Accordingly, there is great practical interest in being able to understand and explore methods for modifying glass surfaces so as to alter or otherwise control its response, especially for tailoring attributes like adhesion, reactivity, charging behavior, and surface chemical interactions or durability …”

Section: Introductionmentioning

confidence: 99%

Structure and composition of surface depletion layers in poled aluminosilicate glasses

2019

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Thermal poling processes can be used to form modified surface layers on glass that, under ion‐blocking electrode conditions, are depleted of virtually all network‐modifying cations relative to the network‐forming species. During this process, many outstanding questions remain as to the structure of these layers and how it may vary between glasses of different “parent” composition, with important implications for resultant surface properties and industrial applications of this technology. This phenomenon of depleting modifiers is particularly difficult to rationalize in aluminosilicate glass compositions, where—in the parent glass—aluminum ions are predominantly present as cation‐charge‐compensated [AlO4]− tetrahedra prior to poling. Here, we present results of a detailed investigation into the surface depletion layers formed across a wide range of ternary sodium aluminosilicate (NAS) glasses, applying a host of surface‐sensitive spectroscopy methods to directly interrogate the resulting composition and structure within the Na‐depleted, anode‐side surface layers. The desired depletion layers were successfully formed on all of the NAS glasses attempted, all showing (a) near‐complete depletion of alkali within 300‐500 nm‐thick layers on the anode‐side surfaces, (b) thin zones of Al depletion with the Na‐depleted layer, and (c) the absence of injected H+ ions that could serve as an alternative charge‐compensation mechanism. These data essentially confirmed a true binary Al2O3–SiO2 composition inside the depletion layers. However, no significant structural dependence was found as a function of parent glass, where initial compositions ranged from peralkaline to charge‐balanced. Importantly, TEM imaging showed the depletion layers to be fully amorphous and homogeneous (not phase‐separated) at the nanoscale, despite final compositions in the range of 5‐33 mol% Al2O3—a composition space notoriously prone to phase‐separation if prepared by conventional melting. Within the depletion layers, ELNES and TEY‐XANES evidence is shown for retention of Al in a 4‐coordinated state, along with XPS data indicating elimination of non‐bridging oxygen. Taken as a whole, our results indicate a highly‐connected aluminosilicate network, most likely with a relatively high concentration of 3‐coordinated oxygen—or O “triclusters”—as a plausible means of charge‐compensating 4‐coordinated Al in the absence of Na+ or H+. The combined results of this work provide convincing new evidence for unique glass structures within the depletion layers not achievable through analogous melt pathways, with important implications for surface properties.

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Hydrogen ion induced mechanochemical wear of soda lime silica glass in acid solutions

Qiao

Xiao

et al. 2021

Journal of Non-Crystalline Solids

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Enhanced tribological properties of barium boroaluminosilicate glass by thermal poling

Cited by 7 publications

References 36 publications

Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na⁺/K⁺‐ion exchange effects

Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na⁺/K⁺‐ion exchange effects

Structure and composition of surface depletion layers in poled aluminosilicate glasses

Hydrogen ion induced mechanochemical wear of soda lime silica glass in acid solutions

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Enhanced tribological properties of barium boroaluminosilicate glass by thermal poling

Cited by 7 publications

References 36 publications

Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na+/K+‐ion exchange effects

Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na+/K+‐ion exchange effects

Structure and composition of surface depletion layers in poled aluminosilicate glasses

Hydrogen ion induced mechanochemical wear of soda lime silica glass in acid solutions

Contact Info

Product

Resources

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Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na⁺/K⁺‐ion exchange effects

Differences in surface failure modes of soda lime silica glass under normal indentation versus tangential shear: A comparative study on Na⁺/K⁺‐ion exchange effects