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| Effect of space-holding particles content on porous titanium alloy plate prepared by powder rolling |
| QIAN Chen-chen1，2,HE Yi-qiang1, HAN Shen-li2,HU Ke2,CUI Li-qun2, XU Hu-lin1 |
| 1 Jiangsu Ocean University, Lianyungang 222005,China，2 Guangdong Institute of Materials and Processing, Guangzhou 510650, China |
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Abstract Large-size porous TC4 titanium alloy plate with porosity of 42.8%-68.5% was successfully prepared by applying the powder space holder method to the powder rolling process. Ammonium bicarbonate particles with volume fraction of 40%-70% was added into the TC4 alloy powders as the space holders. The results show that the rolling pressure and thickness of the green plates decreased with the increase of space-holding particles’ content when the rolling process parameters are fixed constant. After debinding at 200 °C and subsequent vacuum sintering at 1 250 °C, the porosity of the prepared TC4 plate increased with the space holder content. When the content of space holders ranging from 60% to 70%, the pore connectivity increased, and the pore distribution became homogenous. The maximum porosity of the prepared porous TC4 alloy plate was 68.5%. The tensile strength of the porous TC4 alloy plate decreased from 124.7 MPa to 12.7 MPa, when the content of the ammonium bicarbonate particles increased from 40% to 70%. With increasing the space holder content, the stressed position transformed from the pore walls to the pore edges, and then the fracture surface decreased, when the porous TC4 alloy plate was under tensile stress.
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Received: 19 July 2018
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2020, Vol. 30 
