Abstract Porous Ni wicks with high porosity and controllable pore characteristics were fabricated by powder metallurgy method using polymethylmethacrylate (PMMA) as pore-forming agent and carbonyl Ni powder as raw material. The phase composition, micro-structure and mechanical properties of porous Ni were investigated by X-ray diffraction (XRD), scanning electron microscope SEM and mechanical testing instrument. The effects of sintering temperature, the particle size and content of PMMA on pore structures and mechanical properties of porous Ni were investigated. The results show that with the increase of sintering temperature, the porosity and average pore size decrease, mechanical properties increase. With the increase of the particle size and content of PMMA, the porosity and average pore size increase, mechanical properties decrease. The porous Ni wicks with the most excellent comprehensive performance can be fabricated by sintering at the temperature of 800 ℃ with 80% volume fraction addition of PMMA (5 μm). The porosity, average pore size, flexural strength and compressive strength are 71.9%, 2.37 μm, 25.3 MPa and 8.7 MPa, respectively.
LI Qiang,GAN Xueping,LI Zhiyou, et al. Fabrication and mechanical properties of porous Ni wicks[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(4): 361-367.
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2018, Vol. 23 
