Preparation and thermal shock resistance of cordierite-spodumene composite ceramics for solar heat transmission pipeline. Issue 12 (September 2016)

• Record Type: Journal Article
• Authors: Wu, Jianfeng; Hu, Cheng; Xu, Xiaohong; Zhang, Yinfeng; Lu, Chenglong; Wang, Dongbin
• Is Part Of: Ceramics international. Volume 42:Issue 12(2016)
• Page Start: 13547
• Page End: 13554
• Publication Date: 2016-09
• Subjects: Thermal shock resistance -- Cordierite -- Spodumene -- Composite ceramics -- Solar heat transmission pipeline; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.05.147
• Languages: English
• ISSNs: 0272-8842

Abstract

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-Al2 O3 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 MgAl2 O4, 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.