Fabrication and characteristics of sintered copper-silica composites

5th International Conference Recent Trends in Structural Materials

Kargul, M.^1 ; Borowiecka-Jamrozek, J.^1 ; Konieczny, M.^1

Department of Metal Science and Materials Technologies, Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Al. Tysiaclecia P.P. 7, Kielce

25-314, Poland^1

关键词: Commercial powders;    Compaction pressure;    Electrical conductivity;    Hydraulic press;    Silica composites;    Sintered compacts;    Sintering process;    Sintering time;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/461/1/012005/pdf
DOI  :  10.1088/1757-899X/461/1/012005

来源: IOP

【 摘 要 】

The paper presents the results of research on the production of a sintered Cu-SiO2 composites fabricated by powder metallurgy. The starting materials for obtaining the composites were commercial powders: Cu and SiO2. SiO2 particles were introduced into a copper matrix in the amount of 2.5 %, 5 %, 7.5 % and 10 % by weight. Finished powders mixtures were subjected to single pressing with a hydraulic press at a compaction pressure of 620 MPa and then subjected to sintering process at 900 °C in an atmosphere of dissociated ammonia. The sintering time was 60 minutes. The sintered compacts were subjected to the following tests: hardness, measurement of density, electrical conductivity and abrasion resistance. The highest density was obtained for a composite containing 2.5 % SiO2 which was 7.94 g/cm3. The highest hardness was obtained for a composite containing 10 % SiO2 which amounted to 50 HB. For the composite containing 2.5 % SiO2 the highest electrical conductivity was obtained which was 47 MS/m. The highest abrasive wear resistance was obtained for a composite containing 10 % SiO2. Both density and electrical conductivity decreased along with the increase of SiO2 content in composites.