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Torres, F.; Benino, Yasuhiko; Komatsu, Takayuki; Lavelle, C.

doi:10.1023/a:1011808926424

Cited by 24 publications

(9 citation statements)

References 18 publications

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“…The two principal conditions for achieving high transparency are low optical scattering and low atomic absorption in the visible range. [23][24][25] Transparent glass-ceramics appear to be an ideal material for advanced armour applications due to their relatively good transparency, low density, relatively high fracture strength as well as their thermal and chemical stability. However, compared with the most popular polycrystalline ceramics (e.g.…”

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confidence: 99%

Mechanical Properties and Impact Resistance of a New Transparent Glass‐Ceramic

Cunha

Peitl

et al. 2007

Adv Eng Mater

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The focus in ceramic armour development today is towards improved protection capability combined with an overall reduction in production cost. [1][2][3][4][5] Because of their brittle nature, ceramics and glasses are susceptible to localized surface damage in the form of cracking when subjected to impact by foreign objects. [6,7] Much work has been carried out on the dynamic impact behaviour of ceramics and glasses. [1][2][3][4][5] Tests have been carried out using small ceramic or metallic spheres, impacting at high speed in so-called ballistic tests. In these tests, projectiles are accelerated toward their target by utilizing specialised devices called gas guns. [8][9][10][11][12][13][14] The development of transparent glass-ceramics with a reinforced surface layer is a promising approach to novel armour materials since glass-ceramics combine high strength with improved fracture toughness compared with glass and yet they can be reliably produced using cost-effective processing methods. [15,16] A number of technical reports have been published in the last forty years regarding different types of transparent glass-ceramics, [17][18][19][20] but very few focused on their use as armour materials. The most attractive advantage of glass-ceramics is the possibility of using standard glass processing methods followed by controlled heat treatment, which is a fast and reliable production method, resulting in almost no residual porosity in the materials. Moreover the melting plus heat-treatment route offers very good reproducibility compared with the alternative method based on powder processing and sintering commonly used in polycrystalline ceramics, which is prone to microstructure inhomogeneity. In the majority of previous investigations, transparent glass-ceramics have been obtained, which exhibit the presence of nanocrystals within an amorphous matrix. [21,22] This nanostructure (with less than 70 % crystalline phase) guarantees optical transparency since the crystal size is smaller than the wavelength of visible light. The two principal conditions for achieving high transparency are low optical scattering and low atomic absorption in the visible range. [23][24][25] Transparent glass-ceramics appear to be an ideal material for advanced armour applications due to their relatively good transparency, low density, relatively high fracture strength as well as their thermal and chemical stability. However, compared with the most popular polycrystalline ceramics (e.g. Al 2 O 3 ), glass-ceramics exhibit lower fracture toughness. [26][27][28][29][30] The fracture toughness of glass-ceramics can be increased by using the ion-exchange method, similarly to that used in chemically toughened glass. The technique of ion-exchange is one of the most effective alternatives to minimize the detrimental effect of surface flaws in glass bodies (inherent to their processing and use) because it produces compressive stresses on the glass surfaces by substituting the smaller ions (e.g. Na + ) in the glass by larger ions (K + ), a component of...

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confidence: 99%

Mechanical Properties and Impact Resistance of a New Transparent Glass‐Ceramic

Cunha

Peitl

et al. 2007

Adv Eng Mater

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“…21) In the previous studies, Komatsu et al 5)-8), 20) reported deformation behaviors during Vickers nanoindentations in some transparent crystallized glasses consisting of nanocrystals in the K2O-Nb2O5-TeO2 and K2O-Nb2O5-GeO2 systems. It has been reported that the Martens hardness increases with increasing heat treatment temperature.…”

Section: Jcs-japanmentioning

confidence: 95%

Deformation during Vickers nanoindentation in highly oriented nonlinear optical Ba2TiGe2O8 crystalline layers at glass surface

Komatsu

Torres

2008

J. Ceram. Soc. Japan

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Transparent surface crystallized glasses consisting of c-axis oriented nonlinear optical Ba2TiGe2O8 crystalline layers (~10 μm)at the surface of 40BaO·20TiO2·40GeO2 glass are prepared, and their deformation behaviors are examined from the load/ unload displacement curves obtained with the Vickers nanoindentation technique. It is found that the surface crystalline layers deform easily in small loadings during Vickers nanoindentations in comparison with the precursor glass with a homogeneous random glass structure. The surface crystalline layers subjected to the penetration depth of h = 0.5 μm show a large elastic recovery of ~70% compared with that (49%) in the precursor glass. The sliding (displacement) of about 0.02 μm is observed immediately after the stop of the loading with a loading speed of 5 μm/s in the surface crystallized samples. The present study suggests that the deformation behaviors of the surface Ba2TiGe2O8 crystalline layers in the crystallized glass might be closely related to the assemblage state of highly oriented crystals, in particular, the bonding (i.e., the degree of the adhesion ) among c-axis oriented crystals might be weak.

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“…It is, therefore, of interest to develop transparent TeO 2 -based crystallized glasses (glass-ceramics), and this topic is regarded as frontiers in the glass science and technology because of limited reports on the crystallization of TeO 2 -based glasses. For example, transparent crystallized glasses exhibiting a second harmonic generation (SHG) have been fabricated in the glass with the composition of 15K 2 O-15Nb 2 O 5 -70TeO 2 [6][7][8][9][10][11][12][13][14]. The crystallization behavior of BaO-RE 2 O 3 -TeO 2 glasses (RE: La, Pr, Sm, Eu, Er) has been also examined, and transparent crystallized glasses with fluorite-type RE 2 Te 6 O 15 or RE 2 Te 5 O 13 nanocrystals (∼50 nm sizes) were successfully fabricated [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Formation of nonlinear optical Na₂TeW₂O₉ crystals and laser irradiation in tungsten–tellurite glasses

Wang¹,

Honma²,

Komatsu³

2017

Journal of Asian Ceramic Societies

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The crystallization behavior of 25Na 2 O-50WO 3-25TeO 2 glass was examined to develop transparent glass-ceramics containing nonlinear optical Na 2 TeW 2 O 9 crystals. It was clarified from XRD analysis and Raman scattering spectra that a metastable crystalline phase is formed initially and the stable crystalline phase of Na 2 TeW 2 O 9 is created through the transformation of the metastable phase. Laser irradiations (continuous wave Yb:YVO 4 fiber laser, wavelength of 1080 nm) with the condition of the laser power of P = 0.55 W and scanning speed of S = 2.3 m/s created the patterning of homogeneous crystals lines. The crystalline phase in the laser irradiated part was proposed to be the metastable crystalline phase from micro-Raman scattering spectra.

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Untitled

Cited by 24 publications

References 18 publications

Mechanical Properties and Impact Resistance of a New Transparent Glass‐Ceramic

Mechanical Properties and Impact Resistance of a New Transparent Glass‐Ceramic

Deformation during Vickers nanoindentation in highly oriented nonlinear optical Ba2TiGe2O8 crystalline layers at glass surface

Formation of nonlinear optical Na₂TeW₂O₉ crystals and laser irradiation in tungsten–tellurite glasses

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Untitled

Cited by 24 publications

References 18 publications

Mechanical Properties and Impact Resistance of a New Transparent Glass‐Ceramic

Mechanical Properties and Impact Resistance of a New Transparent Glass‐Ceramic

Deformation during Vickers nanoindentation in highly oriented nonlinear optical Ba2TiGe2O8 crystalline layers at glass surface

Formation of nonlinear optical Na2TeW2O9 crystals and laser irradiation in tungsten–tellurite glasses

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Formation of nonlinear optical Na₂TeW₂O₉ crystals and laser irradiation in tungsten–tellurite glasses