Structural properties and ablation behaviors of homogeneous ZrC multi-layer coated on carbon/carbon composites via a multi-step vacuum plasma spray coating process
IF 3.1 4区 物理与天体物理Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
A-Young Moon , Ho Seok Kim , Jong Geun Bae , Deog Gyun Cho , Woon-Yong Park , Se Youn Moon
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引用次数: 0
Abstract
Ablation-resistant zirconium carbide (ZrC) layers were coated onto carbon/carbon (C/C) composites using vacuum plasma spraying. The structural and ablative characteristics of ZrC layers applied in single-versus multi-step coating processes were compared. An increase in the number of coating cycles from 4 to 20 in single-step coating increased the ZrC layer's thickness from 32.3 μm to 116.2 μm even though the coating rate per cycle was reduced from 8.1 μm/cycle to 5.8 μm/cycle. By increasing the number of cycles, the substrate surface was continuously heated, enhancing the lateral spread of molten droplets and improving the porosity and hardness of the ZrC layer. On the other hand, multi-step coating, involving repetition of the single-step process, yielded a 20% thickness increase of ZrC layers with a higher coating rate while maintaining comparable mechanical properties despite an identical total number of coating cycles. Furthermore, the multi-step-coated layers showed better thermal oxidation resistance than the single-step-coated layers due to the formation of ZrC/ZrC interfaces having larger grain boundaries and the thicker ZrCxOy layers, effectively barring oxygen diffusion. The multi-step coating of identical ZrC layers suggested the better thermal oxidation resistant protection way for C/C composite without the reduction of coated layer's properties.
期刊介绍:
Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications.
Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques.
Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals.
Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review.
The Journal is owned by the Korean Physical Society.