02097nas a2200265   4500008004100000022001400041245012000055210006900175260005700244300001400301490000700315520117600322653002401498653000901522653001901531653002201550653001601572653001801588100002001606700002301626700001901649700002001668700001901688856012401707       2015                        eng d  a0361-523500aLow-temperature sintering and microwave dielectric properties of Zn2SiO4 ceramic added with crystalline zinc borate0 aLowtemperature sintering and microwave dielectric properties of   a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUL  a2312-23200 v443 a<p>The physical and dielectric properties of composites of known microwave materials, Zn2SiO4 and Zn3B2O6, prepared by solid-state reaction, were investigated with the purpose of developing a low-loss dielectric material for low-temperature co-fired ceramic applications. An off-stoichiometric phase of Zn2SiO4 with extra SiO2 was used to avoid the occurrence of unreacted ZnO. During sintering, zinc borate was found to partially react with residual SiO2 to form Zn2SiO4. The residual zinc borate was converted to a boron-rich glassy phase which helped to reduce the sintering temperature of the composite. Good relative sintering density (&gt; 90%) at temperatures below the melting temperature of zinc borate is indicative of a sintering mechanism of diffusion-based mass transfer. Composites containing 15 wt.% zinc borate, 2.5 wt.% lithium carbonate and 20 wt.% zinc borate in zinc silicate had dielectric constants of 6.8 and 6.1, quality factors (Qxf) of 48,800 and 94,300 GHz when sintered at 900A degrees C and 950A degrees C, respectively. These quality factor results are close to the best values reported for zinc silicate at these sintering temperatures.</p>10adielectric constant10aLTCC10aquality factor10asintering density10azinc borate10azinc silicate1 aChaware, Varsha1 aDeshmukh, Ravindra1 aSarode, Chetan1 aGokhale, Suresh1 aPhatak, Girish  uhttp://library.ncl.res.in/content/low-temperature-sintering-and-microwave-dielectric-properties-zn2sio4-ceramic-added-001668nas a2200181   4500008004100000245013900041210006900180260000800249300001600257490000700273520096400280100001701244700001801261700002201279700002001301700003801321856012701359       2016                        eng d00aLaser shielding and thermal ablation characteristics of resorcinol formaldehyde/boronnitride composites for thermal protection systems0 aLaser shielding and thermal ablation characteristics of resorcin  cOCT  a10645-106550 v553 aResorcinol formaldehyde (RF) composites were modified by incorporating different weight ratios of hexagonal boron nitride (h-BN) through a novel in situ polymerization technique. Temperature modulated SAXS was used to understand the changes in polymer network due to h-BN addition. The ablation performance of RF BN composites was evaluated by pulsed laser and oxyacetylene torch tests. Linear ablation resistance under oxyacetylene conditions improved by 18%. Laser ablation resistance increased by 44%. The reasons for improved ablation resistance for RF BN composites were studied using XRD, FTIR, and XPS methods which indicated that h-BN undergoes phase transformation at higher temperatures and also displays typical floral assimilation leading to significant energy consumption. This results in improved ablation resistance. These findings could lead to fabrication of RF BN based thermal protection systems (TPS) having better protection capabilities.1 aDaniel, Alex1 aBadhe, Yutika1 aSrikanth, Ivaturi1 aGokhale, Suresh1 aBalasubramanian, Kandasubramanian  uhttp://library.ncl.res.in/content/laser-shielding-and-thermal-ablation-characteristics-resorcinol-formaldehydeboronnitride