The Experts below are selected from a list of 40587 Experts worldwide ranked by ideXlab platform
Dongbin Wang - One of the best experts on this subject based on the ideXlab platform.
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Preparation and thermal shock resistance of cordierite-spodumene composite ceramics for solar Heat Transmission pipeline
Ceramics International, 2016Co-Authors: Yinfeng Zhang, Dongbin WangAbstract:Abstract Cordierite-spodumene composite ceramics with 5, 10, 15 wt% spodumene used for solar Heat Transmission pipeline were in-situ prepared via pressureless sintering from kaolin, talc, γ-Al 2 O 3 and spodumene. Effects of spodumene on densification, mechanical properties, thermal shock resistance, phase composition and microstructure of the composite ceramics were investigated. The results showed that spodumene used as flux material decreased the sintering temperature greatly by 40–80 °C, and improved densification and mechanical properties of the composite ceramics. Especially, sample A3 with 10 wt% spodumene additive sintered at 1380 °C exhibited the best bending strength and thermal shock resistance. The bending strengths of A3 before and after 30 thermal shock cycles (wind cooling from 1100 °C to room temperature) were 102.88 MPa and 96.29 MPa, respectively. XRD analysis indicated that the main phases of the samples before 30 thermal shock cycles were α-cordierite, α-quartz and MgAl 2 O 4 , and plenty of β-spodumene appeared after thermal shock. SEM micrographs illustrated that the submicron β-spodumene grains generated at the grain boundaries after thermal shock improved the thermal shock resistance. It is believed that the cordierite-spodumene composite ceramics can be a promising candidate material for Heat Transmission pipeline in the solar thermal power generation.
Yu Xu - One of the best experts on this subject based on the ideXlab platform.
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effect of dolomite and spodumene on the performances of andalusite composite ceramics for solar Heat Transmission pipeline
Ceramics International, 2015Co-Authors: Xiaohong Xu, Xiaoyang Xu, Jianfeng Wu, Yaxiang Zhang, Kun Li, Yu XuAbstract:Abstract Andalusite composite ceramics used for solar Heat Transmission pipeline were fabricated via pressureless sintering from andalusite, PSZ, Suzhou kaolin and talc. The effects of dolomite and spodumene on densification, mechanical properties, phase transformation, microstructure and thermal shock resistance of the composite ceramics were investigated. Results demonstrated that dolomite and spodumene used as flux materials promoted densification greatly, and the lowest sintering temperature of the composite ceramics was decreased significantly by 90–150 °C, comparing with the previous works with the usage of potassium feldspar and albite as flux materials. Introducing an appropriate amount(7 wt%) of spodumene improved thermal shock resistance of the composite ceramics since no cracks formed after 30 thermal shock cycles (air cooling from 1100 °C to RT) with a bending strength increasing rate of 22.41%. XRD patterns indicated that the dominant phases of samples before and after 30 thermal shock cycles were consistently mullite, ZrSiO 4 and m-ZrO 2 , while the content of mullite increased after thermal shock, resulting in the enhancement of bending strength. It is believed that the andalusite composite ceramics can be a promising candidate material for Heat Transmission pipeline in the solar thermal power generation.
Yinfeng Zhang - One of the best experts on this subject based on the ideXlab platform.
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Preparation and thermal shock resistance of cordierite-spodumene composite ceramics for solar Heat Transmission pipeline
Ceramics International, 2016Co-Authors: Yinfeng Zhang, Dongbin WangAbstract:Abstract Cordierite-spodumene composite ceramics with 5, 10, 15 wt% spodumene used for solar Heat Transmission pipeline were in-situ prepared via pressureless sintering from kaolin, talc, γ-Al 2 O 3 and spodumene. Effects of spodumene on densification, mechanical properties, thermal shock resistance, phase composition and microstructure of the composite ceramics were investigated. The results showed that spodumene used as flux material decreased the sintering temperature greatly by 40–80 °C, and improved densification and mechanical properties of the composite ceramics. Especially, sample A3 with 10 wt% spodumene additive sintered at 1380 °C exhibited the best bending strength and thermal shock resistance. The bending strengths of A3 before and after 30 thermal shock cycles (wind cooling from 1100 °C to room temperature) were 102.88 MPa and 96.29 MPa, respectively. XRD analysis indicated that the main phases of the samples before 30 thermal shock cycles were α-cordierite, α-quartz and MgAl 2 O 4 , and plenty of β-spodumene appeared after thermal shock. SEM micrographs illustrated that the submicron β-spodumene grains generated at the grain boundaries after thermal shock improved the thermal shock resistance. It is believed that the cordierite-spodumene composite ceramics can be a promising candidate material for Heat Transmission pipeline in the solar thermal power generation.
Xiaohong Xu - One of the best experts on this subject based on the ideXlab platform.
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effect of dolomite and spodumene on the performances of andalusite composite ceramics for solar Heat Transmission pipeline
Ceramics International, 2015Co-Authors: Xiaohong Xu, Xiaoyang Xu, Jianfeng Wu, Yaxiang Zhang, Kun Li, Yu XuAbstract:Abstract Andalusite composite ceramics used for solar Heat Transmission pipeline were fabricated via pressureless sintering from andalusite, PSZ, Suzhou kaolin and talc. The effects of dolomite and spodumene on densification, mechanical properties, phase transformation, microstructure and thermal shock resistance of the composite ceramics were investigated. Results demonstrated that dolomite and spodumene used as flux materials promoted densification greatly, and the lowest sintering temperature of the composite ceramics was decreased significantly by 90–150 °C, comparing with the previous works with the usage of potassium feldspar and albite as flux materials. Introducing an appropriate amount(7 wt%) of spodumene improved thermal shock resistance of the composite ceramics since no cracks formed after 30 thermal shock cycles (air cooling from 1100 °C to RT) with a bending strength increasing rate of 22.41%. XRD patterns indicated that the dominant phases of samples before and after 30 thermal shock cycles were consistently mullite, ZrSiO 4 and m-ZrO 2 , while the content of mullite increased after thermal shock, resulting in the enhancement of bending strength. It is believed that the andalusite composite ceramics can be a promising candidate material for Heat Transmission pipeline in the solar thermal power generation.
M. Ogawa - One of the best experts on this subject based on the ideXlab platform.
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Heat Transmission during thermal shock testing of ceramics
Journal of Materials Science, 1994Co-Authors: Tadahiro Nishikawa, Tie Gao, Masayoshi Hibi, Manabu Takatsu, M. OgawaAbstract:The thermal shock resistance of ceramics is generally evaluated by the water-quench test, in which it is important and necessary to understand the Heat-Transmission behaviour. A novel and simple method for measuring the transitional changes of temperatures in ceramics has been proposed. Changes in temperature at two different positions in zirconia ceramics were measured to estimate the temperature distribution. From the analytical results, it was clear that the Heat-Transmission behaviour changed with the quenching temperature or water temperature. The Biot number also changed remarkably with time or with the surface temperature in this experiment. These results are useful in practice for examining the cooling conditions in the thermal shock test.