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Study on High Temperature Oxidation-resistant Coating on TZM Alloy

Author: ZuoKai
Tutor: YaoZhengJun
School: Nanjing University of Aeronautics and Astronautics
Course: Materials Science
Keywords: TZM alloy Pack cementation Hot-dip Aluminide Coating High-temperature oxidation
CLC: TG174.4
Type: Master's thesis
Year: 2010
Downloads: 82
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Abstract


The TZM alloy has a high melting point, high strength , low linear expansion coefficient , corrosion resistance , and good high - temperature mechanical properties , and thus as the first choice of the molybdenum -based alloys are widely used in the aerospace, power generation, nuclear reactors , military industry and chemical industry and other fields . Easily oxidized in air at high temperatures , however , its application has been a lot of restrictions . For the above problem , this article uses a solid powder pack cementation method and a hot - dip plating method, the surface of the base body in the TZM alloy preparation of anti- alumina coating . In this thesis explores the ideal process of the solid powder pack cementation method and hot-dip aluminide coatings prepared by scanning electron microscopy ( SEM ) , EDS ( EDS ) , X - ray diffraction (XRD) Modern test analysis means of characterizing tissue morphology , chemical composition and phase composition , and mechanical properties of the coating and high temperature oxidation behavior of the coating . The results show that : the TZM alloy in the 1050 ℃ solid powder embedding aluminized 12h, formed in its surface layer of uniform dense aluminide diffusion coating , the thickness of the diffusion layer of 130μm , has a double layer structure, and between the base body forming a metallurgical bond ; the pack cementation phase of the aluminum layer is composed of metal intermetallic compounds in the Al5Mo, Al3Mo and Al4Mo ; aluminide coating on the surface of granular microhardness of 8000 MPa ; 800 ° C a 80h high temperature cyclic oxidation test confirmed the solid powder pack cementation aluminum layer greatly improve the high temperature oxidation resistance of the TZM alloy matrix . TZM alloy hot dip aluminizing coating tissue from the surface of the pure aluminum layer and the inner layer of the alloy layer composition, wherein the alloy layer is mainly like Al4Mo and Al5Mo molybdenum aluminum intermetallic compound is composed ; adding 0.3wt% of Ce help improve the organization of the hot-dip aluminized layer ; alloy layer thickness increase with the rise of hot-dip aluminized temperature increase with prolonged hot dip aluminum ; 800 ° C , 100h cyclic oxidation tests proved TZM alloy by hot dip aluminum can effectively improve the high temperature oxidation capacity .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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