Protection behavior of Ti-SiO2 modified potassium silicate coating on K447a alloy at 1000 °C

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-09-24 DOI:10.1016/j.ceramint.2024.09.301

Yao Du , Zheng Chen , Yiliang Lu , Lanlan Yang , Cheng Wang , Shenglong Zhu , Fuhui Wang

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Abstract

Potassium silicate coatings cured by calcium hydrogen phosphate and modified by fillers of Ti and SiO₂ powders were prepared on K447A alloy at 120 °C. The influences of Ti, SiO₂ and both powders on the oxidation behavior of the coated specimens were investigated at 1000 °C for 100 h in static air by thermogravimetry, SEM, XRD and EPMA. The bare K447A alloy suffered severe oxidation at 1000 °C, and the TGO was found to be composited of an outer layer of mixtures of NiCr₂O₄, CoAl₂O₄ and rutile TiO₂, and an inner α-Al₂O₃ layer. The potassium silicate coating without filler showed local damages where formation and rapid rupture of bubbles occurred and consequently the local substrate was oxidized. The SiO₂ powder in the coatings is more capable of reducing O diffusion thru the coatings than the Ti powder, while the latter is more effective in getting rid of bubble rupture than the former. Thus, the coating modified by 10 wt% Ti and 20 wt% SiO₂ showed the best protective performance.

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1000 °C 时 K447a 合金上的 Ti-SiO2 改性硅酸钾涂层的保护行为

在 K447A 合金上制备了由磷酸氢钙固化并由 Ti 和 SiO2 粉末填料改性的硅酸钾涂层，温度为 120 °C。通过热重仪、扫描电镜、XRD 和 EPMA，研究了 Ti、SiO2 和这两种粉末在 1000 °C 静态空气中 100 小时对涂层试样氧化行为的影响。裸露的 K447A 合金在 1000 ℃ 时发生了严重氧化，TGO 由外层的 NiCr2O4、CoAl2O4 和金红石 TiO2 混合物以及内层的 αAl2O3 层组成。没有填料的硅酸钾涂层出现局部损坏，气泡形成并迅速破裂，导致局部基底氧化。涂层中的二氧化硅粉末比钛粉末更能减少 O 在涂层中的扩散，而后者比前者更能有效地消除气泡破裂。因此，由 10 wt% Ti 和 20 wt% SiO2 改性的涂层显示出最佳的保护性能。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.