Papers by Author: Jia Lou

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Authors: Jia Lou, Brian Gabbitas, De Liang Zhang
Abstract: The role of lubrication on the consolidation behaviour of titanium powder, density increase and change in microstructure on subsequent sintering was investigated. HDH titanium powder mixed with 0-2wt% stearic acid or magnesium stearate was cold compacted. It was found that 0.3-0.6wt% of internal lubricant significantly improves the compressibility. However, more than 0.6wt% of lubricant aids the densification in the low-pressure region but limits the maximum density at high pressure. Moreover, 0.3-0.6wt% of lubricant offers a more uniform density distribution to the powder compact, while greater than 0.6wt% of lubricant leads to a segregation of lubricant in the surface region. The shape retention, ejection behaviour, de-lubrication behaviour and sintered properties were also studied in this work.
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Authors: Jia Lou, Brian Gabbitas, De Liang Zhang
Abstract: In order to investigate the role of lubrication on the density gradient of titanium powder, a coloured layer method was employed. HDH titanium powder mixed with 0-1wt% stearic acid (SA) or magnesium stearate (MgSt) was cold compacted under different pressures. Coloured and uncoloured powders were used to give different layers in the die before compaction. The in situ density of different sections was calculated by measuring the height of the different layers. By using this method, the role of lubrication on the density gradient of titanium powder was experimentally measured. It was found that 0.3wt% of lubricant significantly improves the density variation, but further additions give only a slight improvement. An addition of 0.6wt% of SA provides an optimum density variation. The sintering results show that by using a very small amount of lubricant during processing there are no significant amounts of residual contaminants remaining in the Ti alloy.
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