改性粉煤灰基高温定形相变材料的制备及性能研究

doi:10.19799/j.cnki.2095-4239.2023.0671

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (12): 3699-3708.doi: 10.19799/j.cnki.2095-4239.2023.0671

改性粉煤灰基高温定形相变材料的制备及性能研究

肖天烈¹^,²(), 郁青春¹^,²(), 刘治平³, 阴树标¹

^1.昆明理工大学冶金与能源工程学院，云南昆明 650093
^2.昆明理工大学真空冶金国家工程研究中心，云南昆明 650093
^3.鄂尔多斯应用技术学院矿山地质与环境院士专家工作站，内蒙古鄂尔多斯 017000

收稿日期:2023-09-26 修回日期:2023-10-26 出版日期:2023-12-05 发布日期:2023-12-09
通讯作者: 郁青春 E-mail:956345147@qq.com;yqcy@163.com
作者简介:肖天烈（1997—），男，硕士研究生，研究方向为相变储能材料，E-mail：956345147@qq.com；
基金资助:
粉煤灰改性真空烧结制备储能材料的基础研究(20230ITYSZJGZZ-001)

Preparation and properties of modified fly ash-based high temperature-shaped composite phase change materials

Tianlie XIAO¹^,²(), Qingchun YU¹^,²(), Zhiping LIU³, Shubiao YIN¹

^1.Faculty of Metallurgical and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
^2.National Engineering Research Centre of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
^3.Minegeology and Environment Academician and Expert Workstation, Ordos Institute of Technology, Ordos 017000, Inner Mongolia, China

Received:2023-09-26 Revised:2023-10-26 Online:2023-12-05 Published:2023-12-09
Contact: Qingchun YU E-mail:956345147@qq.com;yqcy@163.com

摘要/Abstract

摘要：

定形复合相变材料(SCPCM)具有高能量存储密度和高热稳定性的优点，然而内部的相变介质在持续吸热发生相变时，熔融态的相变介质容易泄漏，造成材料变形和腐蚀的问题。利用氢氧化钠(NaOH)对粉煤灰(FA）进行简单的改性处理，以改性粉煤灰(mFA)为陶瓷基体材料，Al-12Si合金粉为相变介质，通过混合烧结法制备高温定形复合相变材料(HTSCPCM)。采用扫描电子显微镜(SEM)、X射线能谱分析仪(EDS)、X射线衍射仪(XRD)、全自动比表面及孔隙度分析仪(BET)、同步热分析仪(TG-DSC)和导热系数仪(Hot Disk)等进行测试与表征。结果表明，碱改性制备的mFA表面呈丰富的多级结构，比表面积由3.82 cm²/g提升到40.86 cm²/g，孔容由0.008 cm³/g提升到0.085 cm³/g。混合烧结法制备的Al-12Si/mFA HTSCPCM成形效果良好，Al-12Si合金粉与改性粉煤灰陶瓷基体结合紧密，基体对Al-12Si合金粉的最大负载率为65%，相变潜热为97.76 J/g，热导率为15.10 W/(m·K)。在经过100次冷热循环后，形态依旧完整，无泄漏情况发生，相变潜热变为91.32 J/g，循环前后仅降低6.6%。因此，本工作制备的Al-12Si/mFA HTSCPCM具有相变温度适宜、热导率高、储热密度高和易加工等优点，有望在高温储热领域被应用。

关键词: 粉煤灰, 相变材料, 热能储存, 铝硅合金

Abstract:

Shaped composite phase change materials (SCPCMs) have the advantages of high energy storage density and high thermal stability. However, the internal phase change medium in the molten state is prone to leakage as it continuously absorbs heat during phase changes, resulting in material deformation and corrosion. To overcome this, a high temperature-shaped composite phase change material (HTSCPCM) was prepared using sodium hydroxide-modified fly ash (mFA) as a ceramic matrix and Al-12Si alloy powder as a phase change medium using a hybrid sintering method. Testing and characterization were conducted using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, fully automated specific surface and porosity analyses, thermogravimetry-differential scanning calorimetry, and thermal conductivity. The results showed that sodium hydroxide-modification of FA resulted in multilevel surfaces and enhanced specific surface area (3.82 to 40.86 cm²/g) and pore volume (0.008 to 0.085 cm³/g). The Al-12Si alloy was shown to be securely bonded to the mFA ceramic matrix. The maximum loading of the matrix to the Al-12Si alloy was 65%, the latent heat of phase transition was 97.76 J/g, and the thermal conductivity was 15.10 W/(m·K). After 100 thermal cycles, the morphology of the AI-12Si/mFA HTSCPCM was unchanged, and no leakage was observed. The latent heat of the phase change was 91.32 J/g, and it decreased by only 6.6% before and after each cycle. The AI-12Si/mFA HTSCPCM prepared in this work has the advantages of a suitable phase transition temperature, high thermal conductivity, high heat storage density, and ease of processing. The results of this study indicate that this AI-12Si/mFA HTSCPCM can be used in the field of high-temperature heat storage.

Key words: fly ash, phase change material, thermal energy storage, Al-Si alloy

中图分类号:

TB 333

肖天烈, 郁青春, 刘治平, 阴树标. 改性粉煤灰基高温定形相变材料的制备及性能研究[J]. 储能科学与技术, 2023, 12(12): 3699-3708.

Tianlie XIAO, Qingchun YU, Zhiping LIU, Shubiao YIN. Preparation and properties of modified fly ash-based high temperature-shaped composite phase change materials[J]. Energy Storage Science and Technology, 2023, 12(12): 3699-3708.

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化学成分	SiO₂	Al₂O₃	CaO	Na₂O	MgO	K₂O	烧失量
FA/%	51.10	26.43	3.96	0.72	0.79	2.22	7.74
mFA/%	39.30	31.65	4.18	8.69	0.87	1.15	7.35

名称	Al-12Si合金	Al-12Si合金粉
相变温度/℃	577	580
相变潜热/(J/g)	499.2	391.7

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改性粉煤灰基高温定形相变材料的制备及性能研究

Preparation and properties of modified fly ash-based high temperature-shaped composite phase change materials

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样品	比表面积/(m²/g)	孔隙总体积/[cm³/(g·nm)]
FA	3.82	0.008
mFA	40.86	0.085