Method for preparing coating on niobium-based alloy by using aluminoboriding process

• Main Authors: LI WEIZHOU, LIU WEI, YUAN MINGJIA, XU AN, ZHOU MIN, YANG YANG, CHEN QUANZHI, QIN ZEHUA
• Format: Patent
• Language: Chinese; English
• Published: 05.03.2014
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention discloses a method for preparing a coating on a niobium-based alloy by using aluminoboriding process. An aluminum-boron high-temperature anti-oxidation coating is successfully prepared on a niobium-based high-temperature alloy through a pack cementation technology according to a reasonable proportion of an aluminum-boron pack cementation agent, wherein the thickness of the coating is 30-70 microns; and the high-temperature anti-oxidation coating contains four phases, including NbAl3, NbB2, AlB12 and Nb5B6. The method disclosed by the invention has the advantages that: 1. the process is simple, the operation is convenient, the obtained high-temperature anti-oxidation coating is uniform, continuous, dense, good in combination property and unlikely to drop or separate, and the high-temperature anti-oxidation coating repairs the Al2O3 oxidation coating to effectively improve the high-temperature anti-oxidation performance of a base; and 2. under the same conditions and within the temperature range o