Effect Of Different Atmosphere For Different Sintering Temperature On Physical And Mechanical Properties Of Sub Micron WC-Co Powder Through The Powder Metallurgy

Nur Nabila, Mahazid (2013) Effect Of Different Atmosphere For Different Sintering Temperature On Physical And Mechanical Properties Of Sub Micron WC-Co Powder Through The Powder Metallurgy. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Tungsten Carbide Cobalt (WC-Co) is hard metal that is widely used for metal cutting technology. Majority of turning tools and milling cutters are providing of a part from the wear resistant structural parts. The cutting edge consists of a separate piece of material, brazed, welded or clamped on the tool body. From the previous research, cuttings tools was produced by Powder Metallurgy technique using the Vacuum Furnace. However, the apparatus have higher cost production and time consuming to complete the sintering process. Alternative method using Horizontal Tube Furnace can reduced the time, cost of electricity and cost of production during the sintering process. The objective of this research to study the effect of different atmosphere for different sintering temperature on physical and mechanical properties of Sub-Micron WC-Co powder through the powder metallurgy. In this research, the powders 94 gram of WC and 6 gram of Co powders were mixed with 1 gram of paraffin wax, 60 ml of heptane and WC ball in the plastic container using Tabular Shaker Mixer at the speed of 56 rpm for 3 hours. After mixing, the slurry was dried in Microprocessor Controller Oven at 55°C for 2 hours to remove the heptanes from the mixtures. Then, the dried powder were sieved to separate the tungsten ball and to obtain a fine and well-mixed powder before do the compaction process. The WC-Co was sintered using two types of furnace; the tube furnace and vacuum furnace using four different temperatures of 1300°C, 1350°C, 1400°C and 1450°C. Vickers Microhardness Test, Density Test, Transverse Rupture Strength (TRS) and Scanning Electron Microscope (SEM) were used to characterize the samples. WC-Co sample using Horizontal Tube Furnace at temperature 1450°C was selected as the best temperature and furnace compared to Vacuum Furnace due to the good result obtained from the Vickers Microhardness Test, Density Test, Transverse Rupture Strength (TRS) and Scanning Electron Microscope (SEM).

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