Authors : Alaa H. Jaafar and Haydar Al-Ethari
Abstract: This study focuses on the influence of Cubic Boron Nitride (CBN) particles as reinforcement additive on the properties of Nickel Aluminum Bronze (NAB) alloy of composition Cu-9Al-5Ni-4Fe prepared by powder metallurgy technique. The compact pressure was determined as 700 MPa and the green samples sintered at 930°C for 90 min in vacuum high temperature tube furnace, then heat treated by quenched from 900°C in cold water and tempered at 500°C for 30 min. Cubic boron nitride particles of 0.5, 1, 1.5 and 2 as weights percentage were added as reinforcement particles to the alloy. The influence of the CBN particles on physical, mechanical and elastic properties of the base alloy had been investigated to achieve that the tests included are: XRF test, particle size test, XRD analysis, optical microscope analysis, hardness test, compression test, porosity test, ultrasonic test, thermal conductivity test and coefficient of thermal expansi on test. The study showed that the addition of 1.5 wt.% of boron nitride particles has the preferable effect on the mechanical properties where such addition could increase hardness by 59% and compression strength by 16.03%. Experimental results showed that such addition could also increase the elastic properties and porosity and decreased the density, thermal conductivity and coefficient of thermal expansion.
Alaa H. Jaafar and Haydar Al-Ethari, 2018. Influence of Cubic Boron Nitride on the Physical and Mechanical Properties of NAB Alloy Prepared by Powder Matallurgy. Journal of Engineering and Applied Sciences, 13: 874-879.