Effect of Si3N4-Nd2O3 Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials

2011 ◽  
Vol 335-336 ◽  
pp. 728-731
Author(s):  
Shu Bin Shen ◽  
Jing Long Bu ◽  
Li Xue Yu ◽  
Shu Long Liu ◽  
Zhi Fa Wang
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Expansion Ratio ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Ratio Analysis ◽  
Fused Quartz

Fused quartz granules (d50=19 μm) were used as raw material, and Si3N4-Nd2O3 (1:1, in mass) 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. The apparent porosity, bending strength and thermal expansion ratios of the samples were studied and the samples were further analysed by means of XRD and SEM. The results showed that the sample sintered at each temperature with 3% Si3N4-Nd2O3 had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% Si3N4-Nd2O3 was useful to the sintering of fused quartz ceramic materials. The results of XRD and thermal expansion ratio analysis showed that 3% Si3N4-Nd2O3 compound additive had better effect on inhibiting crystallization of the samples sintered at 1300 °C, 1350 °C and 1400 °C.

Effect of Gd2O3-Nd2O3 Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials

2011 ◽  
Vol 335-336 ◽  
pp. 665-668
Author(s):  
Heng Yong Wei ◽  
Shu Long Liu ◽  
Jing Long Bu ◽  
Shu Bin Shen ◽  
Li Xue Yu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Expansion Ratio ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Ratio Analysis ◽  
Fused Quartz

Fused quartz granules (d50=19 μm) were used as raw material, and Gd2O3-Nd2O3 (1:1, in mass) 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. The apparent porosity, bending strength and thermal expansion ratios of the samples were examined and the samples were further analysed by means of XRD and SEM. The results showed that the sample sintered at each temperature with 3% Gd2O3-Nd2O3 had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% Gd2O3-Nd2O3 was helpful to sintering of fused quartz ceramic materials. The results of XRD and thermal expansion ratio analysis showed that 3% Gd2O3-Nd2O3 compound additive had better effect on inhibiting crystallization of the samples sintered at 1300 °C and 1350 °C, but had a little effect on inhibiting crystallization of the sample sintered at 1400 °C.

Effect of B4C-Yb2O3 Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials

2011 ◽  
Vol 291-294 ◽  
pp. 24-28
Author(s):  
Shu Bin Shen ◽  
Jing Long Bu ◽  
Li Xue Yu ◽  
Zhi Fa Wang ◽  
Rong Lin Wang ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Xrd Analysis ◽  
Expansion Ratio ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Obvious Effect ◽  
Fused Quartz

Fused quartz granules (d50=19 μm) were used as raw material, and B4C-Yb2O3 (1:1, in mass) 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 1250 °C, 1300 °C, 1350 °C and 1400 °C for 1 h. The apparent porosity, bending strength and thermal expansion ratios of the samples were examined and they were analysed by means of XRD and SEM. The results showed that the sample sintered at each temperature with 3% B4C-Yb2O3 had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% B4C-Yb2O3 was conducive to sintering of fused quartz ceramic materials. The results of XRD analysis and thermal expansion ratio analysis showed that 3% B4C-Yb2O3 compound additive had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. It can be deduced that the 3% B4C-Yb2O3 compound additive plays the excellent role in inhibiting crystallization and facilitating sintering of fused quartz ceramic materials.

Effect of B4C-Si3N4 on Crystallization and Sintering of Fused Quartz Ceramic Material

2014 ◽  
Vol 1004-1005 ◽  
pp. 401-404 ◽  
Author(s):  
Jing Long Bu ◽  
Yan Feng He ◽  
Shu Bin Shen ◽  
Yue Jun Chen ◽  
Ying Lei Gu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Xrd Analysis ◽  
Expansion Ratio ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Obvious Effect ◽  
Fused Quartz

Fused quartz granules (d50=19 μm) were used as raw material, and B4C-Si3N4 (1:1, in mass) 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 1250 °C, 1300 °C, 1350 °C and 1400 °C for 1 h. The apparent porosity, bending strength and thermal expansion ratios of the samples were examined and they were analysed by means of XRD. The results showed that the sample sintered at each temperature with 1% B4C-Si3N4 had the lowest apparent porosity, the highest bending strength. This indicated that 1% B4C-Si3N4 was conducive to sintering of fused quartz ceramic materials. The results of XRD analysis and thermal expansion ratio analysis showed that 1% B4C-Si3N4 compound additive had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. It can be deduced that the 1% B4C-Si3N4 compound additive plays the excellent role in inhibiting crystallization and facilitating sintering of fused quartz ceramic materials.

The Influence of Al2O3-AlN Compound Additive on the Crystallization Characteristics and Properties of Fused Quartz Ceramic Materials

2012 ◽  
Vol 535-537 ◽  
pp. 824-827
Author(s):  
Shu Bin Shen ◽  
Jing Long Bu ◽  
Li Xue Yu ◽  
Jun Xing Chen ◽  
Zhi Fa Wang
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Expansion Ratio ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Obvious Effect ◽  
Fused Quartz

Fused quartz granule (d50=10μm) was used as raw material, and Al2O3-AlN (1:1, in mass) was used as additive with dosages of 1 wt%, 2 wt% and 3 wt%. The crystallization characteristics of fused quartz ceramic fabricated in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1h has been investigated by thermal expansion ratio and XRD. The results showed that the crystallization characteristics were markedly improved by 1 wt% AI2O3-AIN compound additive. 1 wt% Al2O3-AIN had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. The apparent porosity, bending strength and SEM of the samples were also examined. The results showed that the samples with 1 wt% AI2O3-AIN had the lowest apparent porosity among the samples containing Al2O3-AlN, the highest bending strength, and the sample AA1 sintered at 1350°C had more compact microstructure, which indicated that 1 wt% Al2O3-AlN was conducive to sintering of fused quartz ceramic materials. It can be deduced that the 1 wt% Al2O3-AIN compound additive plays the excellent role on inhibiting crystallization and promoting sintering of fused quartz ceramic materials.

Influence of CeO2 Nanopowder on Crystallization Behavior and Sintering Performance of Fused Quartz Ceramic Materials

2011 ◽  
Vol 415-417 ◽  
pp. 1060-1063
Author(s):  
Li Xue Yu ◽  
Yue Jun Chen ◽  
Jing Long Bu ◽  
Jun Xing Chen ◽  
Zhi Fa Wang
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Expansion Ratio ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Fused Quartz ◽  
Crystallization Inhibitor ◽  
Quartz Ceramics

Fused quartz granule was used as raw material, and CeO2 nanopowder was used as additive with dosages of 1wt %, 2 wt % and 3 wt %. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h, respectively. The properties of samples including apparent porosity, bending strength and thermal expansion ratio were measured. The results show that the sample with 1 wt % CeO2 nanopowder has the lowest apparent porosity, the highest bending strength and the lowest thermal expansion ratio. The XRD and SEM results show that through the CeO2 nanopowder adding, the diffraction peak intensity of quartz phase in the fused quartz ceramics decrease, and the microstructure of the samples become more compact. It can be deduced that CeO2 nanopowder plays the excellent role as the crystallization inhibitor and sintering assistant to fused quartz materials sintered at various temperatures.

Influence of La2O3 Nanopowder on Crystallization Behavior and Sintering Performance of Fused Quartz Ceramic Materials

2011 ◽  
Vol 415-417 ◽  
pp. 1074-1077
Author(s):  
Jing Long Bu ◽  
Yue Jun Chen ◽  
Jun Xing Chen ◽  
Li Xue Yu ◽  
Zhi Fa Wang
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Expansion Ratio ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Inhibiting Effect ◽  
Fused Quartz ◽  
Quartz Ceramics

Fused quartz granule was used as raw material, and La2O3 nanopowder was used as additive with dosages of 1wt %, 2 wt % and 3 wt %. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h, respectively. The properties of samples including apparent porosity, bending strength and thermal expansion ratio were measured. The results show that the sample with 2 wt % La2O3 nanopowder has the lowest apparent porosity and the highest bending strength, and sample added 1% nano-La2O3 has the best inhibiting effect on crystallization of fused quartz. The samples with La2O3 nanopowder adding have lower thermal expansion ratio than blank sample. The XRD and SEM results show that the diffraction peak intensity of quartz phase decrease and the microstructure of the samples become more compact, after the La2O3 nanopowder was added into fused quartz ceramics. It indicated that La2O3 nanopowder has excellent inhibiting effect on crystallization of fused quartz and facilitating effect on sintering of fused quartz ceramics.

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.

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.

Influence of Nano-Yb2O3, Nano-Nd2O3 and Nano-Dy2O3 on Sintering and Crystallization of Fused Quartz Ceramic Materials

2013 ◽  
Vol 750-752 ◽  
pp. 517-520
Author(s):  
Ying Lei Gu ◽  
Jing Long Bu ◽  
Chao Ma ◽  
Dong Mei Zhao ◽  
Zhi Fa Wang
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Quartz Powder ◽  
Obvious Effect ◽  
Fused Quartz ◽  
Lower Thermal Expansion

Fused quartz powder (d50=19μm) was used as raw material, nano-Yb2O3, nano-Nd2O3 and nano-Dy2O3 were dividedly used as additive with dosages of 3% each. Fused quartz ceramic materials were sintered in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1h. The influence of rare earth nanooxides on sintering and crystallization of the fused quartz ceramic were researched by measurements of apparent porosity, bending strength and thermal expansion ratios, and analyses of XRD and SEM. The results showed that samples added nano-Yb2O3 and nano-Nd2O3 have lower apparent porosity, higher bending strength and lower thermal expansion rate. It can be deduced that additives nano-Yb2O3 and nano-Nd2O3 have obvious effect on facilitating sintering and inhibiting crystallization of fused quartz materials at experimental temperatures.

Effect of Nano-Nd2O3 on Sintering and Crystallization of Fused Quartz Ceramic Materials

2012 ◽  
Vol 602-604 ◽  
pp. 499-502
Author(s):  
Ying Lei Gu ◽  
Jing Long Bu ◽  
Li Xue Yu ◽  
Jun Xing Chen ◽  
Zhi Fa Wang
Keyword(s):  
Thermal Expansion ◽  
Bending Strength ◽  
Ceramic Materials ◽  
Quartz Ceramic ◽  
Apparent Porosity ◽  
Raw Material ◽  
Sintering Behavior ◽  
Quartz Powder ◽  
Fused Quartz

Fused quartz powder (d50=19μm) was used as raw material, and nano-Nd2O3 was used as additive with dosages of 1% (in mass, similarly hereinafter), 2% and 3%. The effects of nano-Nd2O3 on crystallization and sintering behavior of the materials at various temperatures (1300 °C/1h, 1350 °C /1h and 1400°C /1h) were studied by measurements of apparent porosity, bending strength and thermal expansion ratios (RT~1200°C), and analyses of XRD and SEM. The results of XRD and thermal expansion ratios analysis showed that 3% nano-Nd2O3 additive had excellent effect on inhibiting crystallization of the samples sintered at 1350 °C and 1400°C. The results showed that the samples sintered at various temperatures with 3% nano-Nd2O3 had the lowest apparent porosity and more compact microstructure. This indicated that 3% nano-Nd2O3 had better effect on facilitating sintering of fused quartz materials.

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