Conductive vitrimer nanocomposites enable advanced and recyclable thermo-sensitive materials

2020 ◽  
Vol 8 (34) ◽  
pp. 11681-11686
Author(s):  
Sheng Wang ◽  
Songqi Ma ◽  
Lijun Cao ◽  
Qiong Li ◽  
Qing Ji ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Expansion Rate ◽  
Conductive Nanocomposites ◽  
High Thermal Expansion

Vitrimers with high thermal expansion rate were innovatively explored to produce advanced and recyclable thermo-sensitive conductive nanocomposites and sensors.

Novel Silicon-Elastomers for Advanced Soft Lithography

2006 ◽  
Vol 947 ◽  
Author(s):  
Kyung Choi
Keyword(s):  
Thermal Expansion ◽  
High Resolution ◽  
Soft Lithography ◽  
Materials Properties ◽  
Nano Scale ◽  
Thermal Expansion Coefficients ◽  
High Thermal Expansion ◽  
Expansion Coefficients

ABSTRACTHigh resolution pattern transfers in the nano-scale regime have been considerable challenges in ‘soft lithography’ to achieve nanodevices with enhanced performances. In this technology, the resolution of pattern integrations is significantly rely on the materials' properties of polydimethylsiloxane (PDMS) stamps. Since commercial PDMS stamps have shown limitations in nano-scale resolution soft lithography due to their low physical toughness and high thermal expansion coefficients, we developed stiffer, photocured PDMS silicon elastomers designed, specifically for nano-sized soft lithography and photopatternable nanofabrications.

High thermal expansion KAlSiO4 ceramic

1996 ◽  
Vol 31 (6) ◽  
pp. 1431-1433 ◽  
Author(s):  
T. Ota ◽  
T. Takebayashi ◽  
M. Takahashi ◽  
Y. Hikichi ◽  
H. Suzuki
Keyword(s):  
Thermal Expansion ◽  
High Thermal Expansion

Effect of Annealing Temperature and External Tensile Stress on Negative Thermal Expansion to Cold Rolled Ti–23Nb–0.7Ta–2Zr Alloy

2020 ◽  
Vol 12 (9) ◽  
pp. 1409-1412
Author(s):  
Jeong-Tae Moon ◽  
Tae-Hyun Nam
Keyword(s):  
Thermal Expansion ◽  
Annealing Temperature ◽  
Negative Thermal Expansion ◽  
Constant Load ◽  
External Stress ◽  
Expansion Rate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cold Rolled ◽  
The Difference

The effect of annealing temperature and external stress on the thermal expansion of a Ti–23Nb–0.7Ta–2Zr alloy were investigated by means of thermal expansion tests under constant load and X-ray diffraction (XRD). Negative thermal expansion (NTE), which is a shrinkage during heating, was observed in both a cold rolled and annealed specimens. The intensity of (200)β peak decreased while that of (211)β peak increased as the annealing temperature increased. The difference in expansion rate between 50 °C and 250 °C is found to decrease with an increasing annealing temperature from 600 °C to 800 °C, above which it kept almost constant. The expansion rate decreased as the applied stress increased.

Effect of Si3N4-Y2O3 Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials

2011 ◽  
Vol 335-336 ◽  
pp. 713-716
Author(s):  
Shu Long Liu ◽  
Zhi Fa Wang ◽  
Jing Long Bu ◽  
Shu Bin Shen ◽  
Li Xue Yu
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Expansion Rate ◽  
Obvious Effect ◽  
Fused Quartz

Fused quartz granules (d50=19 μm) were used as raw material, and Si3N4-Y2O3 (1:1, in mass) was used as additive with dosages of 1%, 2% and 3% (in mass). Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h. The effect of Si3N4-Y2O3 on crystallization and sintering of the fused quartz ceramic materials were researched by measurements of apparent porosity, bending strength and thermal expansion rate (RT~1200 °C), and by the analyses of XRD and SEM. The results showed that the samples sintered at each temperature with 3% Si3N4-Y2O3 had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% Si3N4-Y2O3 was conducive to sintering of fused quartz ceramic materials. The results of XRD and thermal expansion rate showed that addition of 3% Si3N4-Y2O3 compound had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. It can be deduced that the Si3N4-Y2O3 compound plays the best role in inhibiting crystallization and facilitating sintering of fused quartz ceramic materials.

A Novel SOFC/SOEC Sealing Glass with a Low SiO2Content and a High Thermal Expansion Coefficient

2017 ◽  
Vol 78 (1) ◽  
pp. 1739-1747 ◽  
Author(s):  
Ragnar Kiebach ◽  
Karsten Agersted ◽  
Philipp Zielke ◽  
Ilaria Ritucci ◽  
Mette Bybjerg Brock ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
High Thermal Expansion ◽  
Sealing Glass ◽  
High Thermal Expansion Coefficient

Influence of Nano-Y2O3 on Crystallization Behavior and Sintering Performance of Fused Quartz Ceramic Materials

2011 ◽  
Vol 284-286 ◽  
pp. 1366-1369
Author(s):  
Yue Jun Chen ◽  
Zhi Fa Wang ◽  
Li Xue Yu ◽  
Jing Long Bu ◽  
Rong Lin Wang ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Expansion Rate ◽  
Peak Intensity ◽  
Fused Quartz ◽  
Crystallization Inhibitor

Fused quartz granule (d50=0.019 mm) was used as raw material, nano-Y2O3 (size<0.08 μm) was used as additive with dosages of 1% (in mass, similarly hereinafter), 2% and 3%. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h. Properties of samples were researched by measurements of apparent porosity, bending strength and thermal expansion rate, and analyzed by XRD and SEM. The results showed that additive nano-Y2O3 had good inhibiting effect on crystallization of fused quartz sintered at various temperatures, sample added 2% nano-Y2O3 had least thermal expansion rate, diffraction peak intensity and apparent porosity, and it had higher bending strength and more compact microstructure, especially sample sintered at 1350 °C. It can be deduced that 2% nano-Y2O3 plays the excellent role as the crystallization inhibitor and sintering assistant to fused quartz materials sintered at various temperatures.

Preparation and Characterization of Thermally Compatible Leucite-Reinforced Dental Ceramics

2011 ◽  
Vol 308-310 ◽  
pp. 311-314
Author(s):  
Jin Wen ◽  
Shu Zhen Sun
Keyword(s):  
Thermal Expansion ◽  
Dental Ceramics ◽  
Dental Porcelain ◽  
Thermal Expansion Coefficients ◽  
High Thermal Expansion ◽  
Coprecipitation Technique ◽  
Thermal Compatibility ◽  
The Common ◽  
Expansion Coefficients

The high average thermal expansion required for thermal compatibility of dental porcelain with their substrate alloy is supplied by the mineral leucite (KAlSi2O6). In the research, the high thermal expansion coefficients phase leucite was prepared by coprecipitation technique. Three materials with formulae of K2O∶Al2O3∶SiO2= 1∶1∶x ( x=1.4, 2.0, 4.0 ) were investigated for differences in phase, thermal expansion. Unstoichiometric composition where K2O and Al2O3were added properly is advantage to leucite obtained. Coprecipitation processing produced fine leucite powder that would sinter at 1300°C, this temperature is about 200°C lower than of melting method. The average thermal expansion coefficients of leucite is 22.7×10-6/°Cfrom room temperature to 620°C,which is higher than the common porcelain. Changing in the leucite content of dental porcelain would results from thermal expansion coefficients of porcelain variation, which could be responsible for changes in porcelain-metal thermal compatibility.

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