Wei Liu

North University of China · School of Materials Science and Technoolgy

In this study, a combination of Ni elemental and Al2O3 ceramic reinforcing phases was introduced through an electroless plating method to address the issue of load-bearing and wear in dental implants resulting from friction within the oral environment and during food mastication. This was followed by combining CoCrMo powder and reinforcing phase po...

In this study, we systematically examined the influence mechanisms of introduced cobalt coated alumina (Co-coated Al2O3) particles on the microstructure and properties of cobalt-chromium-molybdenum (CoCrMo) alloy printed by Laser Powder Bed Fusion (LPBF). The Co-coated Al2O3 composite powders with different density of cobalt coating were prepared b...

In this work, porous honeycomb lead zirconate titanate (PZT) ceramics with one dimensional ordered pore channels were fabricated by the ionotropic gelation of sodium alginate/PZT suspension with SrCl2 solution, then the piezoelectric cement/PZT paste with different mass fraction of PZT component were cast into the porous ceramics to produce cement-...

In this study, nickel coated alumina ([email protected]2O3) particles were prepared via electroless plating, and ball milled with CoCrMo alloy powder in the proportion of 0 wt% to 2 wt%. Then the [email protected]2O3 reinforced CoCrMo alloy were manufactured by selective laser melting (SLM) process. The microstructure, mechanical property and wear...

In this work, 3-3 type porous lead zirconate titanate (PZT) ceramics were fabricated by incorporating particle-stabilized foams using the gel-casting method. Then, Portland cement pastes with different water/cement ratios (w/c) were cast into the porous ceramics to produce cement-based piezoelectric (PZT-PC) composites. The effects of w/c on phase...

In this research, 3–3 type cement-based piezoelectric composites were prepared by casting Portland cement paste in porous lead zirconate titanate (PZT) ceramics, then the polyvinylidene fluoride (PVDF) of N-methylpyrrolidone solvent with concentration of 50–200 mg ml ⁻¹ was utilized to modify the lead zirconate titanate-Potland cement (PZT-PC) comp...

In this study, porous lead zirconate titanate (PZT) ceramics with porosity ranging from 46.4% to 82.3% were produced by the gel casting technology of particle-stabilized ceramic foams with the solid loading of 5–25 vol%, then the Portland cement paste was cast in porous PZT ceramics with continuous vibration to fabricate 3-3 type cement-based piezo...

In this study, the ANSYS19.0 (APDL) was used to build a finite element model of Selective Laser Melting (SLM) forming cobalt-chromium alloy. The model parameters included the conversion of material properties, convective heat transfer, physical properties with different temperatures, and so on. Based on this model, the dimension of molten pool, tem...

In this work, 3-1 type porous lead magnesium niobate-lead zirconate titanate (PMN-PZT) ceramics with one-dimensional ordered pore channels and strontium oxides (SrO) doping on a molecular level have been fabricated by the ionotropic gelation of sodium alginate/PMN-PZT suspensions with SrCl2 solution. By adjusting the concentration of SrCl2 (0.5–2.5...

Due to the rapid melting and solidification mechanisms involved in selective laser melting (SLM), CoCrMo alloys fabricated by SLM differ from the cast form of the same alloy. In this study, the relationship between process parameters and the morphology and macromechanical properties of cobalt-chromium alloy micro-melting pools is discussed. By meas...

In this study, Sr²⁺ modified porous PMN-PZT ceramics with one-dimensional pore channels were produced by the ionotropic gelation process of alginate/PMN-PZT suspensions. The ion-exchange method was employed during the fabrication procedure to adjust the content of SrO addition. With the SrO addition increasing from 1.653 wt.% to 2.957 wt.%, the str...

In this work, Al2O3 honeycomb ceramics with unidirectionally aligned channels were fabricated by the ionotropic gelation process of alginate/Al2O3 suspensions. By heating the bottom of the suspension container during the gelation step, the heat energy conducted upward from foot to the top surface of the slurry, which has shortened the gelation time...

In this study, 3-1 type lead zirconate titanate (PZT) ceramics with one-dimensional pore channels were produced by ionotropic gelation process of alginate/PZT suspensions. By increasing the sodium alginate concentration from 1.0 wt% to 3.0 wt%, the alginate/PZT suspensions turned from Newtonian to non-Newtonian behavior with substantial increase in...

The formation of capillaries in sodium alginate gels is a dissipative process driven by unidirectional diffusion of divalent cations into sodium alginate sols. In the present work, we have prepared 3-1 type porous lead zirconate titanate (PZT) ceramics with oxides (CaO) being doped on a molecular level from the dissipative process by incorporating...

In this work, 3-1 type PZT ceramics with unidirectionally aligned channels have been fabricated by ionotropic gelation process of alginate/PZT suspensions. The 3-1 type PZT ceramics with porosity ranging from 36.9% to 60.6% were fabricated by adjusting the initial solid loading (5-25 wt%) of slurries. By incorporating CaO into PZT matrix during the...

In this work, gelcast alumina green parts were dried by utilizing polyethylene glycol (PEG) solution as the liquid desiccant medium. The parts lost about 30-40 wt% of internal water in a reasonable period of time, i.e. 2-3 h and accomplished most of the shrinkage uniformly, then the part could continue drying in air at the room conditions. Finally,...

In this work, porous alumina ceramics with highly ordered capillaries were successfully fabricated by ionotropic gelation process of alginate/alumina suspensions. By varying the initial solid loading (10–30 wt%) of slurries, the porosity of alumina ceramics ranged from 60.4% to 79.5% with controlled pore size (180–315 μm). Due to the well-crosslink...

Porous lead zirconate titanate (PZT) ceramics were fabricated by the gel-casting process of particle-stabilized wet foams and sintered at different temperatures. The bulk density and grain size of porous PZT ceramics increased with the increase of sintering temperature from 1150 to 1250 degrees C, which exerted remarkable influence on the value of...

Porous lead zirconate titanate (PZT) ceramics could be produced by combining the particle-stabilized foams and the gelcasting technique. In this study, the foaming capacity of particle-stabilized wet foams was tailored by changing the concentration of valeric acid and pH values of suspension. Accordingly, porous PZT ceramics with different porosity...

In the present work, porous lead zirconate titanate (PZT) ceramics with porosity ranging from 27.8% to 72.4% were fabricated by the gel‐casting process of particle‐stabilized wet foams with the initial solid loading of 10–30 vol%. The phase, the microstructure, the dielectric property, and the piezoelectric property were characterized. The relative...

Magnesium aluminate spinel (MgAl2O4) were synthesized via the sol–gel method, using magnesium aluminum double n-butoxide as precursors. The n-butoxide, prepared by the direct reaction of stoichiometric magnesium, aluminum and adequate n-butanol, was modified by acetylacetone as the chelating agent to control the speed of hydrolysis. Gel samples wer...

A new method to recycle aluminium beverage cans is investigated. Alumina (Al2O3) powders with primary grain size of 10-15 nm were synthesised by the hydrolysis-condensation process of aluminium ethoxide precursors. Here, aluminium ethoxide was prepared through the reaction of the recycling aluminium beverage can with ethanol. The resultant hydrolys...

Monomer content can affect the internal stress during the solidification process and the properties of the green body by gelcasting. The internal stresses of Al2O3 slurries during the solidification process were measured by a self-made sensor. The influence of the monomer content on the internal stresses, mechanical properties and the cracking beha...

MgAl<sub align="right">2</sub>O<sub align="right">4</sub> powder of 100∼300 nm was synthesised by sol-gel process with magnesium aluminium double n-butoxide as precursors. The dried gels transformed to ultrafine powders of MgA1<sub align="right">2</sub>O<sub align="right">4</sub> spinel phase at 800°C, and the intact MgA1<sub align="right">2</sub>O...