导热型氮化硅/聚碳酸酯复合材料的绝缘性能及力学性能研究  

Study on Insulation and Mechanical Properties of Thermal Conductive Si_(3)N_(4)/PC Composites

作　　者：邱继焱[1] 雷艳华[1] QIU Jiyan;LEI Yanhua(Faculty of Automotive and Mechatronic Engineering,Zhoukou Polytechnic,Zhoukou 466000,China)

机构地区：[1]周口职业技术学院汽车与机电工程学院,河南周口466000

出　　处：《塑料科技》2025年第3期59-63,共5页Plastics Science and Technology

摘　　要：研究改性Si_(3)N_(4)掺量对氮化硅/聚碳酸酯(Si_(3)N_(4)/PC)复合材料的热学性能、绝缘性能和力学性能的影响。结果表明:Si_(3)N_(4)掺量较少时,Si_(3)N_(4)分布均匀;Si_(3)N_(4)掺量过大容易引起Si_(3)N_(4)聚集和不均匀分布。随着Si_(3)N_(4)掺量的增加,复合材料的热导率和热稳定性得到提高,体积电阻率和介电常数逐渐增大,拉伸强度、弯曲强度和冲击强度逐渐降低,压缩强度逐渐增大。Si_(3)N_(4)掺量较少时,热导率、热稳定性、绝缘性能和压缩强度增长较快,拉伸强度、弯曲强度和冲击强度降低较慢;Si_(3)N_(4)掺量较高时,热导率、绝缘性能和压缩强度增长变慢,拉伸强度、弯曲强度和冲击强度降低较快,热稳定性有所降低。Si_(3)N_(4)掺入质量分数为30%时,Si_(3)N_(4)/PC的综合性能较好,与纯PC相比,热导率提高538.9%,质量损失5%时的温度提高37℃,体积电阻率和介电常数提高179.6%和22.6%,拉伸强度、弯曲强度和冲击强度分别降低6.7%、5.0%和7.1%,压缩强度提高16.6%。The study investigates the effects of the content of modified Si_(3)N_(4)on the thermal properties,electrical insulation properties,and mechanical properties of silicon nitride/polycarbonate(Si_(3)N_(4)/PC)composites.The results show that when the content of Si_(3)N_(4)is low,it is distributed uniformly.However,excessive Si_(3)N_(4)content tends to cause aggregation and non-uniform distribution of Si_(3)N_(4).As the Si_(3)N_(4)content increases,the thermal conductivity and thermal stability of the composites are enhanced,while the volume resistivity and dielectric constant gradually increase.Meanwhile,the tensile strength,flexural strength,and impact strength decrease gradually,whereas the compressive strength increases.At low Si_(3)N_(4)content,the thermal conductivity,thermal stability,electrical insulation,and compressive strength increase rapidly,while the tensile strength,flexural strength,and impact strength decrease slowly.At high Si_(3)N_(4)content,the growth rate of thermal conductivity,electrical insulation,and compressive strength slows down,while the tensile strength,flexural strength,and impact strength decrease more rapidly,and the thermal stability is somewhat reduced.When the mass fraction of Si_(3)N_(4)is 30%,the Si_(3)N_(4)/PC composites exhibit better comprehensive properties.Compared with pure PC,the thermal conductivity is increased by 538.9%,the temperature at which the mass loss reaches 5%is increased by 37℃,the volume resistivity and dielectric constant are increased by 179.6%and 22.6%,respectively.The tensile strength,flexural strength,and impact strength are reduced by 6.7%,5.0%,and 7.1%,respectively,while the compressive strength is increased by 16.6%.

关 键 词：聚碳酸酯 氮化硅 热学性能 绝缘性能 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]