| HU Zhao-wei,LI Wen-ge.Research Review of Mo-Ni-B Ternary Boride Preparation and Properties[J],45(11):1-9 |
| Research Review of Mo-Ni-B Ternary Boride Preparation and Properties |
| Received:March 21, 2016 Revised:November 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.11.001 |
| KeyWord:Mo-Ni-B ternary boride preparation method mechanical properties microstructure wear resistance corrosion resistance |
| Author | Institution |
| HU Zhao-wei |
Shanghai Maritime University, Shanghai , China |
| LI Wen-ge |
Shanghai Maritime University, Shanghai , China |
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| Abstract: |
| Mo-Ni-B ternary boride is of good mechanical property, wear-resistance and corrosion resistance and reaction sintering method is a common preparation method. Adding such elements as Cr, V, Mn repectively or jointly and changing Mo/B atomic ratio had different effects on properties of ternary boride including mechanical properties (transverse rupture strength, hardness), microstructure (mean grain size, shrinkage factor, crystal system formation), wear resistance and corrosion resistance. Tetragonal M3B2, M5B3 and orthorhombic M3B2, M5B3 were generated by Mo2NiB2 due to sintering temperature and element addition during sintering. These phases were closely related to the final properties. Bending strength and hardness would be improved by adding V or Cr, causing a structural transition of Mo2NiB2 from orthorhombic to tetragonal structure. Mo2NiB2 grains were refined and mechanical properties were improved by adding Mn. M5B3 only appeared under the effects of content, heat treatment and Mo/B ratio of the added elements after other elements were added. For the Mo2NiB2 prepared by sintering method, its maximum bending strength was up to 2.25 GPa and maximum hardness was 89.6HRA. The ceramic coating prepared by sintering method should be combined with the substrate after repeated sintering for specific application. However, laser cladding reaction method and other spray methods could form ceramic coating on the substrate directly. The laser cladding reaction method could be used to prepare composite ceramic coating with corrosion resistance higher than that of 304SS stainless steel and hardness of more than 1100HV. The coating’s properties were greatly affected by preparation technology such as laser technological parameter (laser power and scanning speed), powder system (atomic ratio and added elements). A fine Mo2NiB2 coating is obtained when laser power is 2500 W, scanning speed is 1.5 mm/s and Mo/B atomic ratio is 1. |
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