کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1658118 1517658 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural characterization of an electrically insulating diffusion barrier on a plasma-sprayed ceramic for severe environment applications
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Structural characterization of an electrically insulating diffusion barrier on a plasma-sprayed ceramic for severe environment applications
چکیده انگلیسی

We investigate in this paper the physical properties and the structure of a protective barrier based on a thermal-sprayed alumina coating. This coating is known to form an electrically insulating barrier that efficiently protects stainless steel structures of melting furnaces subjected to high differences of voltage. Sealing the open and/or interconnected porosity of the alumina coating with aluminum phosphate is also known to improve the protection by mitigating leakage in the ceramic. The sealing procedure has been achieved by (i) impregnating the plasma-sprayed alumina coating with a mono aluminum phosphate (MAlP) solution and (ii) applying a thermal treatment to the system. A waterproof diffusion barrier presenting a good electric insulation is finally obtained and the protective performances were tested on specimens to assess their behavior under aggressive conditions. The formation procedure is characterized by parameters related to the solution and is dependent on the heating rate, the process temperature, and the isothermal duration of the thermal treatment. We show in this paper how these different parameters impact (i) the coating physical properties (thermal and electrical tests) and (ii) the coating structure that has been probed with 31P solid state nuclear magnetic resonance (NMR).


► Optimization of electrical properties of a sealing alumina coating
► Implementation of a waterproof diffusion barrier with aluminophosphate
► Electrical protection of stainless steel structure of melting furnace

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 220, 15 April 2013, Pages 204–208
نویسندگان
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