Mechanical–Structural Investigation of Chemical Strengthening Aluminosilicate Glass through Introducing Phosphorus Pentoxide

Abstract

Chemical strengthening of aluminosilicate glasses through K + -Na + ion exchange has attracted tremendous attentions because of the accelerating demand for high strength and damage resistance glasses. However, a paramount challenge still exists to fabricate glasses with a higher strength and greater depth of ion-exchange layer (DOL). Herein, aluminosilicate glasses with different contents of P2O5 were prepared, and the influence of P2O5 on the increased compressive stress (CS) and DOL was investigated by micro-Raman technique. It was noticed that the hardness, CS, as well as the DOL substantially increased with an increasing concentration of P2O5 varied from 1 to 7 mol%. The obtained micro-Raman spectra confirmed the formation of relatively depolymerized silicate anions that accelerated the ion exchange. Phosphorus-containing aluminosilicate glasses with a lower polymerization degree exhibited a higher strength and deeper DOL, which suggests that the phosphorus-containing aluminosilicate glasses have promising applications in flat panel displays, windshields, and wafer sealing substrates.

Trends in Effective Diffusion Coefficients for Ion-Exchange Strengthening of Soda-Lime-Silicate Glasses

“…Employed glass compositions are typically chosen for high ion mobility and high conversion to compressive stress, e.g., alkali-aluminosilicates (Burggraaf and Cornelissen, 1964;Burggraaf, 1966;Ragoen et al, 2017), aluminoborosilicates (Morozumi et al, 2015), and, more recently, aluminophosphosilicates (Zeng et al, 2016). The salt composition is then selected from a trade-off between desired exchange species, high treatment temperature, low vapor pressure, target depth of layer and surface stress, and cost.…”

Surface damage resistance and yielding of chemically strengthened silicate glasses: From normal indentation to scratch loading

“…5,7 Besides the many technological aspects of posttreatment, the specific glass composition and network topology were found to be important parameters for achieving efficient chemical strengthening. [8][9][10] For example, very high levels of surface compressive stress are typically obtained in sodium aluminosilicate glasses.…”

“…11 Such understanding is often generated by examining the initiation of well-defined defects, for example, generated using sharp Vickers or Berkovich indenter tips 3 or wedges. 12,13 Also on chemically strengthened glasses, indentation deformation and cracking, 8,[14][15][16][17][18][19][20][21] scratch resistance, [21][22][23][24] abrasive wear, 20 and the response to impact load 16,17,25,26 were extensively studied over the past years. However, sharp contact experiments such as underlying most of these studies represent rather harsh conditions, with local stress easily approaching the range of 10 GPa.…”

Chemical hardening of glazed porcelain tiles

“…Considering the main singular effects, the most significant one is P 2 O 5 in fact an increase in P 2 O 5 content from the minimum to the middle value produces an increase in ΔHV, but a further increase in P 2 O 5 content up to 3wt% leads to a restrained decrease in ΔHV. This trend is consistent with the already known role of P 2 O 5 as both glass former or modifier, according on type and amount of other oxides in formulation: for the series of frits studied in the present work the increasing of the P 2 O 5 acting as modifier promotes the network depolymerization which results in a high tendency of cations to move, favoring the IE; when the P 2 O 5 content further increases the network former role start to take place and therefore the high glass interconnectivity starts to reduces the ions mobility and then the IE effectiveness. At the same time, an increase in Na 2 O or B 2 O 3 content leads to a decrease in ΔHV.…”

“…Furthermore, aluminosilicate glasses are the most promising due to the presence of (Al 3+ ) that in tailored conditions is able to promote the alkaline diffusion . Finally, others glass formers such as B 2 O 3 and P 2 O 5 could promote local environments favoring the diffusion of cations …”