• 材料科学与技术 •

### 膨胀石墨/有机质复合相变材料的制备及性能

1. 1.攀枝花学院钒钛学院，四川 攀枝花 617000
2.四川省太阳能利用技术集成工程实验室，四川 攀枝花 617000
3.太阳能技术集成及应用推广四川省高校重点实验室，四川 攀枝花 617000
• 发布日期:2020-07-10
• 通讯作者: 徐众 E-mail:418968604@qq.com
• 作者简介:徐众（1985—），男，硕士，讲师，研究方向为太阳能技术集成及应用推广。E-mail：418968604@qq.com
• 基金资助:
攀枝花大学科技园发展有限责任公司项种子基金“双创”项目(2019-07);国家级大学生创新项目(201911360002);四川省教育厅太阳能高校重点实验室项目(2018TYNSYS-Y-04);攀枝花市指导性科技计划(2019ZD-S-27)

### Preparation and performances of expanded graphite/organic matter composite phase change materials

Zhong XU1,2,3(), Jing HOU1,2,3, Jun LI1,2, Enhui WU2,3, Ping HUANG2,3, Qianshu LIU2,3, Dawei XU1

1. 1.College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China
2.Sichuan Provincial Engineering Laboratory of Solar Technology Integration, Panzhihua 617000, Sichuan, China
3.Application and Solar Technology Integration Sichuan Provincial Key Laboratory of University, Panzhihua 617000, Sichuan, China
• Published:2020-07-10
• Contact: Zhong XU E-mail:418968604@qq.com

Abstract:

Paraffin (PW), palmitic acid (PA) and stearic acid (SA) were used as the main phase change materials, meanwhile expanded graphite （EG） for the framework. All the composite materials were prepared by melt-blending method, and their thermal and electrical properties were studied. The results showed that the three organic matter, adding expanded graphite with the mass fraction of 7%, 9% and 11%, had no leakage occurred, which were respectively heated in an oven with 65℃, 70℃ and 75℃all at 4MPa pressure for 30 minutes. The thermal storage shortened time of composite phase change materials was respectively 32s, 622s and 231s than the three pure organic matter. And the release shortened time was 1040s, 1327s and 1311s. It means that heating rate of the composite material was faster than the pure organic matter only in the solid state during the thermal storage, while the whole processes of the composite material were faster than the pure organic matter during the thermal release. It was found that all the mass loss rate was below 0.05% after 60 energy storage/release cycles too. The temperature field distribution of the composite materials after molding was more uniform than that of pure organic matter during the thermal storage, unlike that the two distributions were basically the same during the thermal release. The thermal conductivities of the composite materials at different temperatures were 10.12—11.19 times, 9.00—15.50 times and 5.58—6.76 times, respectively than the corresponding organic matter. The resistivities of the composite materials were 0.092—0.150Ω·cm, 0.058—0.146Ω·cm and 0.020—0.041Ω·cm at 2—8MPa pressure, respectively, all less than 1Ω·cm. It indicated that the prepared composite phase change materials had good thermo-physical and electrical properties.It might mean that the temperature rise was suppressed to a certain extent after the composite material molding.

• TK02