The Synthetic and Mechanical Properties of a Silica Matrix Cermet Composite  

作　　者：Sufian H Humeedi Saadoon M Abdulkareem Salih Y Darweesh 

机构地区：[1]Department of Physics,College of Science,Tikrit University,Tikrit,Iraq [2]Physics Department,College of Education,Samaraa University,Samaraa,Iraq [3]Physics Department,College of Education TuzKhurmatu,Tikrit University,Tikrit,Iraq

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2022年第3期423-428,共6页武汉理工大学学报（材料科学英文版）

摘　　要：A cermet composite was prepared by employing thermal spraying flame onto stainless steel surfaces of(304)type.Hence 25,50%of aluminum was mixed with matrix of(10%Al_(2)O_(3)-SiO_(2)).A spray system consistis of oxygen barrel,acetylene and spray gun that contains powders feeder at different spray distances(5,10,15,20 and 25 cm).The thermal treatment of the samples resulting from spraying was performed at 1100℃for 1.5 hr.Some physical examinations(porosity and adhesion),mechanical tests(hardness and wear rate)and Atomic Force Microscope(AFM)test were performed before and after thermal treatment.The test results showed that the best mixing rate was(50%)and the best spray distance was(15cm)where the quality of coating layer improved after thermal treatment at 1100℃for 1.5 hr with a porosity ratio reduced from 11.2%to 6.6%,and adhesion strength improved with the increase in the alumina content to 50%.The results demonstrated that the best adhesion value after thermal treatment was 30.98 MPa.The hardness of coating layer increased from 45.78 to 54.88 HV;while the lowest rate of wear was at 50%of alumina with a spray distance of 15cm.Also,there was a clear improvement based on AFM within grain size,root mean square and roughness rate.

关 键 词：spraying by flame ceramic oxides COMPOSITES atomic force microscope 

分 类 号：TB333[一般工业技术—材料科学与工程]