Vicker's Hardness of glass

Yamane, Masayuki; Mackenzie, John D.

doi:10.1016/0022-3093(74)90044-1

Cited by 164 publications

(82 citation statements)

References 10 publications

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“…The increase in Vickers hardness with increase in CaF 2 content may be due to the replacement of oxygen ions by fluorine ions in the glass matrix. The replacement causes the structure to be more compact and increases the cross linking strength [24]. In the present study, the Young's modulus (E) of the polycomponent glasses has been calculated using the theoretical equation proposed by Makishima and Mackenzie.…”

Section: 1mentioning

confidence: 99%

Structural, optical and mechanical properties of ternary CaO-CaF2-P2O5 glasses

Rao

Shashikala

2014

J Adv Ceram

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Abstract:The ternary phosphate glass series (50x)CaO-xCaF 2 -50P 2 O 5 (x = 0-20 mol%) were synthesized using melt quench technique. Structural, optical and mechanical properties were investigated with increase in CaF 2 content. Using X-ray diffraction (XRD), synthesized glasses were confirmed to be amorphous in nature. Replacement of oxygen ions by fluorine ions increased the values of density. Decrease in refractive index due to the low polarizability of fluorine ions in the glass matrix was observed. In Fourier transform infrared (FTIR) spectra, the slight variation in as  (PO 2 ) band position and intensity could be attributed to replacement of fluorine ions for oxygen ions in phosphate glass structure. These data were well supported by Raman spectra. Optical band gap energy increased from 3.44 eV to 3.64 eV with increase in CaF 2 content, and Urbach energy decreased suggesting that the fluorine ions reduced the tail energy states in the band gap compared to the oxygen ions. Mechanical parameters such as Vickers hardness, fracture toughness and brittleness were evaluated from the Vickers micro indentation measurements. Increase in Vickers hardness, decrease in fracture toughness and increase in brittleness were observed with increase in CaF 2 content.

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Section: 1mentioning

confidence: 99%

Structural, optical and mechanical properties of ternary CaO-CaF2-P2O5 glasses

Rao

Shashikala

2014

J Adv Ceram

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“…However, it must be kept in mind that the techniques used to determine the modulus of elasticity are inadequate to measure the modulus of elasticity of a super®cial layer only a few microns thick. Yamane and Mackenzie [23], however, suggested a method to estimate the elasticity modulus of a surface layer in an indirect manner, using Vickers' microhardness, which is given by the following equation:…”

Section: Classical Theory Of Thermal Shockmentioning

confidence: 99%

Thermal shock properties of chemically toughened borosilicate glass

Peitl

Zanotto

1999

Journal of Non-Crystalline Solids

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This paper describes an experimental test of the uni®ed theory of thermal shock. A borosilicate glass (78.1%SiO 2 ± 13.3%B 2 O 3 ±4.7%Na 2 O±3.4%Al 2 O 3 ) subjected to ion-exchange in molten KNO 3 , was used. The theory predicts the critical temperature dierence for fracture initiation by thermal shock; however, it overestimates the number of cracks which propagate simultaneously. Despite that fact, taken into account the numerous assumptions of the theoretical model and the possible experimental errors, our results indicate a fair agreement between theory and experiment. Ó

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“…Hardness is a measure of the mean contact stress for the formation of a permanent deformation and it is typically quantified by permanently deforming the glass with a sharp indenter (e.g.,Vickers diamond indenter), where hardness (H ) is given by the load (P) divided by the project area (A) as H = P/A. Hardness is a function of chemical composition and different models and approaches have been proposed to predict the composition dependence of glass hardness (Georoff and Babcock, 1973;Yamane and Mackenzie, 1974;Calleja et al, 2002;Smedskjaer et al, 2010a). Relationships between H and various macroscopic properties have also been proposed (Liu and Cohen, 1989;Sehgal and Ito, 1999;Gao et al, 2003;Hand and Tadjiev, 2010), but there is an intrinsic difference in the scaling between hardness and, e.g., elastic moduli.…”

Section: Introductionmentioning

confidence: 99%

Topological Model for Boroaluminosilicate Glass Hardness

Smedskjær

2014

Front. Mater.

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For various advanced glass applications, it is important to understand the composition dependence of indentation hardness. Boroaluminosilicate glasses form the basis of many industrial products and they exhibit complex structural behavior due to the mixed networkformer effect. Based on available structural nuclear magnetic resonance data and a previously proposed approach, we here establish a temperature-dependent constraint model of indentation hardness of sodium boroaluminosilicate glasses. The model correctly predicts the trends of hardness with varying Si/Al and Na/B ratios, including local minima and maxima at intermediate compositions. This topological approach is thus proving to be a valuable tool for exploring and designing new boroaluminosilicate glass compositions with tailored hardness.

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Vicker's Hardness of glass

Cited by 164 publications

References 10 publications

Structural, optical and mechanical properties of ternary CaO-CaF2-P2O5 glasses

Structural, optical and mechanical properties of ternary CaO-CaF2-P2O5 glasses

Thermal shock properties of chemically toughened borosilicate glass

Topological Model for Boroaluminosilicate Glass Hardness

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