Study on preparation and thermal properties of carbonates composite heat storage materials

doi:10.11949/j.issn.0438-1157.20180748

Abstract

Abstract:

Ceramic composite heat storage materials were prepared by mixed sintering method with binary carbonates (Li₂CO₃-K₂CO₃, BC, 62:38, mole ratio) and ternary carbonates (K₂CO₃-Li₂CO₃-Na₂CO₃, TC, 1:2:1, mole ratio) as phase change materials, and with magnesium oxide as the matrix material. The melting point of binary and ternary carbonates composites (BCC, TCC) are 465.1℃ and 386.4℃ respectively, which is similar to the corresponding mixed carbonates. Composite heat storage materials maintain a high specific heat value within the highest using temperature (800℃), and the latent heat is more than 150 J/g. Based on the characterization analysis of XRD and SEM, two kinds of composite heat storage materials have good chemical stability, and the matrix material can well support the phase change material. The thermal properties of the composite heat storage materials don't change significantly and have good thermal cycling stability after 50 thermal cycles.

Key words: mixed carbonates, preparation, phase change, composite materials, latent heat, melting point

摘要：

以二元碳酸盐（Li₂CO₃-K₂CO₃，BC，62：38，摩尔比）和三元碳酸盐（K₂CO₃-Li₂CO₃-Na₂CO₃，TC，1：2：1，摩尔比）为相变材料，以氧化镁为基体材料，通过混合烧结法制备陶瓷基复合蓄热材料。二元碳酸盐复合材料（BCC）和三元碳酸盐复合材料（TCC）的熔点与相应混合碳酸盐的熔点相近，分别为465.1℃和386.4℃，并在其最高使用温度（800℃）范围内维持较高的比热容；且复合材料的潜热值均大于150.0 J/g。基于XRD和SEM的表征分析，两种复合蓄热材料具有较好的化学稳定性，且基体材料能很好地混合支撑相变材料。两种复合材料分别进行50次热循环，其热物性参数没有发生明显变化，具有较好的热循环稳定性。

关键词: 混合碳酸盐, 制备, 相变, 复合材料, 潜热, 熔点

CLC Number:

TK512

SANG Lixia, LI Feng. Study on preparation and thermal properties of carbonates composite heat storage materials[J]. CIESC Journal, 2018, 69(S1): 129-135.

桑丽霞, 李锋. 碳酸盐复合蓄热材料的制备及热物性研究[J]. 化工学报, 2018, 69(S1): 129-135.

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