Methods for improving the mechanical properties of oxide glasses

Donald, I. W.

doi:10.1007/bf00544488

Cited by 99 publications

(73 citation statements)

References 111 publications

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“…The maximum hardness in the studied glass is up to 5.9 GPa. The increment in hardness is mainly attributed to the formation of surface compression through ion exchange, and the hardness decreases afterward is because of the structural relaxation (Garfinkel and King, 1970;Donald, 1989).…”

Section: Resultsmentioning

confidence: 99%

“…It is therefore of the outmost importance to eliminate the defects to improve the strength. Various methods of glass strengthening have been developed extensively over the last few decades, such as thermal tempering (Solinov, 2015), chemical strengthening (Olcott, 1963;Karlsson et al, 2010;Varshneya, 2010a,b), and surface crystallization (Donald, 1989). It is noteworthy that chemical strengthening, which is achieved essentially by immersing an alkali-containing glass in a molten salt bath, generates high compressive stress (CS) in thin or irregularly shaped glass objects without measureable optical distortion, making it the leading candidate for strengthening of glasses (Kistler, 1962;Olcott, 1963;Karlsson et al, 2010;Varshneya, 2010a,b).…”

Section: Introductionmentioning

confidence: 99%

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

Zeng

Yang

et al. 2016

Front. Mater.

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zeng

Yang

et al. 2016

Front. Mater.

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“…De fato, a resistência mecânica teórica dos vidros, excluindo defeitos e considerando assim apenas a influência das ligações químicas, é de aproximadamente 7000 MPa [1]. Todavia, vidros comerciais têm resistência mecânica usualmente entre 35 e 70 MPa [2,3].…”

Section: Introductionunclassified

“…A geração de tensões de compressão na superfície dos componentes vítreos é a maneira mais eficiente de se obter aumento considerável em sua resistência mecânica [1]. Neste caso, a profundidade da camada compressiva deve ser maior que as falhas superficiais presentes, isto é, maior ou igual a 50 µm [1,6,7].…”

Section: Introductionunclassified

“…Neste caso, a profundidade da camada compressiva deve ser maior que as falhas superficiais presentes, isto é, maior ou igual a 50 µm [1,6,7]. Como a maioria das falhas nos vidros alcançam dimensões entre 1 e 10 µm, Varshneya [8] sugere que a profundidade ou espessura da camada compressiva deva ser de aproximadamente 30 µm para promover efetiva proteção contra fratura [9,10].…”

Section: Introductionunclassified

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Cristalização de superfície em vidro do sistema Li2O–ZrO2–SiO2–Al2O3

et al. 2017

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RESUMOA cinética de crescimento da camada superficial cristalizada em um vidro de composição do sistema LZSA, 11,7Li 2 O·12,6ZrO 2 ·68,6SiO 2 ·7,1Al 2 O 3 (% massa), foi estudada. Para a produção do vidro, utilizou-se maté-rias-primas comerciais (Li 2 CO 3 , ZrSiO 4 , SiO 2 , Al 2 O 3 ), as quais foram homogeneizadas e fundidas a 1550 °C por 120 min e então vazadas em molde metálico. Amostras do vidro obtido foram seccionadas e submetidas a tratamentos térmicos em diferentes temperaturas (825-925 °C) e tempos (30-150 min) para formação e crescimento da camada cristalina. Seções transversais das amostras tratadas termicamente foram lixadas e polidas, tal que imagens das camadas cristalizadas pudessem ser visualizadas e medidas por microscopia. Os resultados mostraram que é possível obter vidros do sistema LZSA com camadas cristalizadas contendo principalmente espodumênio-β e silicatos de zircônio e lítio, de espessuras entre 13 e 665 µm, as quais crescem com velocidades entre 0,4 e 4,8 µm/min no intervalo de temperatura estudado.Palavras-chave: Vidros, cinética de cristalização, cristalização de superfície. ABSTRACTGrowth kinetics of crystallized surface layer in a LZSA glass composition, 11.7Li 2 O·12.6ZrO 2 ·68.6SiO 2 ·7.1Al 2 O 3 (wt%), was studied. For the production of the LZSA glass, it was used commercial raw materials (Li 2 CO 3 , ZrSiO 4 , SiO 2 , Al 2 O 3 ) which were mixed and melted at 1550 °C for 120 min and then poured into a metallic mold. Samples of the obtained glass were cut and subjected to heattreatments at different temperatures (825 -925 °C) and times (30 -150 min) for formation and growth of crystalline layer. Cross-sections of the heat-treated samples were ground and polished such that images of the formed crystallized layers could be visualized and measured by microscopy. Results showed that it is possible to obtain LZSA glasses with crystallized layers formed by β-spodumene, zircon and lithium silicate, which present thicknesses between 13 and 665 µm and grow at rates varying from 0.4 to 4.8 µm/min in the studied temperature range.

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Impact Strength of Glass for Armor Applications

Nie¹,

Chen²

2011

Advances in Ceramic Armor VII

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Methods for improving the mechanical properties of oxide glasses

Cited by 99 publications

References 111 publications

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

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

Cristalização de superfície em vidro do sistema Li2O–ZrO2–SiO2–Al2O3

Impact Strength of Glass for Armor Applications

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