Study on Electrical and Mechanical Properties of Calcium Copper Titanate boron Nitride Doped EPDM Composites

CHI Qingguo; YANG Meng; ZHNAG Tiandong; ZHANG Changhai; CHEN Qingguo

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Study on Electrical and Mechanical Properties of Calcium Copper Titanate boron Nitride Doped EPDM Composites

更新时间：2025-12-08

- Study on Electrical and Mechanical Properties of Calcium Copper Titanate boron Nitride Doped EPDM Composites
- Vol. 47, Issue 1, Pages: 223-230(2021)
- 作者机构：
  
  哈尔滨理工大学工程电介质及其应用教育部重点试验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 January 2021，
  
  Published：2021
- 稿件说明：
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CHI Qingguo, YANG Meng, ZHNAG Tiandong, et al. Study on Electrical and Mechanical Properties of Calcium Copper Titanate boron Nitride Doped EPDM Composites[J]. 2021, 47(1): 223-230.
DOI：

CHI Qingguo, YANG Meng, ZHNAG Tiandong, et al. Study on Electrical and Mechanical Properties of Calcium Copper Titanate boron Nitride Doped EPDM Composites[J]. 2021, 47(1): 223-230. DOI：

摘要

非线性电导材料的应用是解决高压直流电缆附件内部电场集中问题的一种有效方案。因此

通过掺杂钛酸铜钙（calcium copper titanate

CCTO）纳米填料对三元乙丙橡胶（ethylene-propylene-diene monomer

EPDM）进行改性

在较低的掺杂体积分数（2%CCTO）下

复合介质展现出较好的非线性电导率;当掺杂10%CCTO时

非线性系数可达到5.40。但同时发现

高掺杂含量复合介质的击穿场强劣化严重。基于此

选择具有良好绝缘及导热特性的六方氮化硼（boronnitride

BN）与CCTO共同掺杂至EPDM中

研究发现

共掺杂复合介质的击穿场强有明显改善

φ=10%CCTO/ω=9%BN/EPDM的特征击穿场强为90.1 kV/mm（φ为体积分数

ω为质量分数）

相比10%CCTO/EPDM（66.3 kV/mm）提高了35.9%

此时

共掺杂复合介质仍然表现出明显的非线性电导特征。此外

探讨了温度对复合介质非线性电导和击穿特性的影响

并对掺杂复合介质的力学性能进行测试分析

研究发现

2种无机填料的掺杂对EPDM力学性能的改善效果较为显著

随着CCTO掺杂含量增加

复合介质的拉伸强度以及断裂伸长率逐渐增加。

Abstract

The application of nonlinear conductivity materials is an effective solution to solve the problem of electric field concentration in HVDC cable accessories. In this paper

ethylene-propylene-diene monomer（EPDM） is modified by doping calcium copper titanate（CCTO） nanofiller. When the doping content is lower（2% CCTO）

the composite exhibits better nonlinear conductivity. When the CCTO volume fraction reaches 10%

the nonlinear coefficient will reach 5.40. Simultaneously

the breakdown field strength of the composites with a higher CCTO content is severely degraded. Based on this phenomenon

hexagonal boron nitride（BN） with good insulation and excellent thermal conductivity is employed to dope into EPDM matrix. The breakdown field strength of the co-doped composites is significantly improved

and the characteristic breakdown field strength when φ=10%CCTO/ω=9%BN/EPDM increases to 90.1 kV/mm（φ is volume fraction

ω is mass fraction）

which is 35.9% higher than that of 10%CCTO/EPDM composites（66.3 kV/mm）

simultaneously

the co-doped composites exhibit obvious nonlinear conductivity. In addition

this paper discusses the effect of temperature on the nonlinear conductivity and breakdown characteristics of the composites. The mechanical properties of single-doped and co-doped composites are tested and analyzed. The results show that the doping of two kinds of inorganic fillers can improve the mechanical properties of EPDM

and the tensile strength and tensile elongation of composites increase gradually with the increase of CCTO doping content.

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