Current and Emerging Materials for 3-5 Micron IR Transmission

Gentilman, Richard L.

doi:10.1117/12.936409

Cited by 38 publications

(17 citation statements)

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“…Further analysis reveals that the samples with higher concentration show very low thermal conductivity which falls below the ideal range and are not desirable for a high quality transparent window which is used for strategic defence and space mission [19]. The variations of thermal conductivity with temperature for different La 3+ concentration sintered via microwave hybrid heating are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…To achieve high thermal shock resistance figure of merit to prevent the shattering of the window material during the missile flight, it should possess high thermal conductivity. Ideally the thermal conductivity values should be in the range of 7-50 W·m 1 ·K 1 [19]. Even though the thermal conductivity is playing a vital role in the performance of high quality transparent window, not much work is reported in the literature regarding this.…”

Section: Introductionmentioning

confidence: 99%

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Influence of La3+ ion in the yttria matrix in improving the microhardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating

et al. 2017

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Abstract:In the present work, hybrid sintering technique which couples the resistive heating and microwave heating is employed to sinter infrared transparent La 0.15 Y 1.85 O 3 to 99.2% of the theoretical density for the first time to the best of our knowledge. The presence of La 3+ in the yttria matrix improves the hardness properties to a greater extent without affecting the transmittance properties, but there is a deterioration in the thermal properties of the sample. So we have limited our studies to La 0.15 Y 1.85 O 3 which shows better optical, thermal, and hardness properties. The pellets fabricated from the ultra-fine nano powder with average particle size of ~12 nm synthesized by combustion technique and sintered at 1430 ℃ with an average grain size of 0.22 µm show ~80.1% transmittance in the UV-visible region and 81% in mid infrared region. For a comparative study of the optical, mechanical, and thermal properties, two other variants of sintering strategies namely conventional sintering and microwave sintering are also employed. A comprehensive analysis on the hardness reveals that the hardness of the pellets sintered via hybrid heating is 9.73 GPa and is superior to the pellets sintered using the other two techniques. The thermal conductivity of the sample is also analyzed in detail. The results clearly indicate that the La 0.15 Y 1.85 O 3 ultra-fine nano powder synthesised by the single-step combustion method and sintered via microwave hybrid heating shows better transmittance properties without compromising the mechanical properties, and can be used very effectively for the fabrication of infrared transparent windows and domes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of La3+ ion in the yttria matrix in improving the microhardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating

et al. 2017

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“…Here h is the heat transfer coefficient and L is the characteristic dimension, which could be the thickness of the window or dome. Table 6.5 compares the thermal shock parameter of CVD-SiC with that of several competing materials [48], [49]. We see that CVD-SiC provides a thermal shock parameter value that is significantly greater than those of all other materials, except CVD diamond.…”

Section: Thermal Shock Resistancementioning

confidence: 95%

High Thermal Conductivity Materials

Shindé

Goela²

2006

130

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“…MgAl 2 O 4 is one of the most excellent optical materials with good light transmission properties in the infrared band, high hardness and corrosion resistance, and has been widely used in a number of military and civilian fields [1][2][3]. However, it is difficult to get smooth surface meeting the practical requirement efficiently because it is crisp and hard, brittle and easy to break.…”

Section: Introductionmentioning

confidence: 98%