The Preparation And Performances Of Nano Carbon-copper Composite Paste Based On Micro Capsule

The copper powder was coated by organic micro capsule antioxidants.The effect of organic carrier on printing property and conductivity of the paste were studied.The glass powder was chosen as the binding phase,and the optimum sintering temperature was determined.The nano carbon and copper powder as conductive phase were mixed in a certain proportion to prepare copper composite paste with high performances.Ethyl cellulose and acrylic resin were chosen as wall material to coate the copper powder.The results show that ethyl cellulose solution?2.5wt%?and acrylic resin?4wt%?have a good antioxidant property and electrical conductivity.The adhesion and printing property of the copper paste printed on the substrate with different organic carrier's compositions was studied.The results show that the best compositions of organic carrier for the copper paste is m_?terpineol?:m_{?ethyl acetate?}:m_{?ethyl cellulose?}:m_?defoamer?:m_{?silane coupling agent?}=80:8:6:3:3.And the printing effect and conductivity of the copper paste prepared by 20²5wt%was the best.The effects of glass powders and sintering temperature on the copper paste's conductivity and printing property were studied.The results show that the glass powder with a glass transition temperature of 360?and a melting temperature of 430?is fit for the preparation of the copper paste.The conductivity of the copper paste sintered at 470?is the best.The effects of carbon nanotube and graphene on the conductivity of copper composite paste were studied.The results show that copper composite paste prepared by single-walled carbon nanotube?the pipe diameter is 1²nm,the pipe range is 5³0?m,CNT:Cu=4:96wt%?and graphene?the flake thickness is 5nm,flake size is 1⁵?m,CNG:Cu=3:97wt%?is the best in conductivity and the resistivity is 6.055m?·cm and2.154m?·cm respectively.Carbon nanotube and graphene can effectively fill and overlap between the copper particles and form a large number of conductive paths.