Effect of Different Amounts of Graphite on the Sintering and Transverse Rupture Properties of Powder Metal Parts

被引:0
|
作者
Mustafa Boz
Adem Kurt
机构
[1] Karabuk Technical Education Faculty Zonguldak Karaelmas University Karabuk 78050 Turkey
[2] Technical Education Faculty Gazi University Besevler 06500 Ankara Turkey
关键词
Powder metallurgy; Sintering; Fe; Graphite; Transverse rupture strength;
D O I
暂无
中图分类号
TF124.5 [];
学科分类号
080502 ;
摘要
Iron powders were mixed with graphite powders by 1;5 wt pct to produce block samples using powder metallurgy technique. The powders were blended in a three dimensional blender for 20 min and compacted in a die under 500 MPa by using a one directional press. Sinterability and mechanical properties of the samples with different carbon content were investigated. Sintering process was carried out on a belt furnace with flame curtain in dissociated ammonia atmosphere. Block samples produced were suitable for ASTM B-312 transverse rupture strength test apparatus and were tested with 0.050 kN/s velocity in a press under 100 g load. It was found that graphite amount up to 2 wt pct increased the contact area of particles and acted as a lubricant to affect the sintering behaviour positively. The results indicated that the samples containing up to 5 wt pct showed good sintering behaviour and also good hardness due to an increase in pearlite amount. However, the samples containing higher amount of graphite (more than 5 wt pct) affected the sintering behaviour negatively due to the settlement of free graphite around the Fe powders, which resulted in a decrease in the hardness and transverse rupture strength.
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页码:419 / 422
页数:4
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