Scan Science and Technology
Contact Leading Edge Experts & Companies
The Experts below are selected from a list of 130611 Experts worldwide ranked by ideXlab platform
Qiangang Fu – 1st expert on this subject based on the ideXlab platform
Bonding Strength thermal shock and oxidation resistance of interlocking zr hf c sic sic double layer coating for c c compositesSurface & Coatings Technology, 2017Co-Authors: Lei Zhuang, Qiangang FuAbstract:
Abstract In order to alleviate the mismatch of CTEs (coefficient of thermal expansions) and increase the Bonding Strength between the outer UHTCs (ultra-high temperature ceramics) coating and the inner SiC coating on C/C composites, a double-layer (Zr,Hf)C-SiC/SiC coating with interlocking structure was designed and prepared on C/C composites by pack cementation. The microstructure, Bonding Strength, thermal shock, and oxidation resistance of the coating were studied. The results showed that the construction of a coarse inner Si-based coating with microholes was beneficial for the outer UHTCs coating materials infiltrating into it, and thus realized a gradient distribution of UHTCs in the whole coating. The Bonding Strength and the thermal shock tests revealed that the adhesion Strength between the inner layer and the outer layer was significantly increased owing to the zigzagged interface. After exposure to 1500 °C for 220 h in air, the coated specimens only had a mass loss of 2 mg·cm −2 , which was attributed to the alleviation of the mismatch of CTEs and the better interface Bonding Strength.
effect of carbon nanotubes on the toughness Bonding Strength and thermal shock resistance of sic coating for c c zrc sic compositesJournal of Alloys and Compounds, 2015Co-Authors: Qiangang Fu, Lei Zhuang, Hejun Li, Lei Feng, Junyi JingAbstract:
Abstract In order to improve the toughness, interface Bonding Strength and thermal shock resistance of SiC coating for C/C–ZrC–SiC composites, carbon nanotubes (CNTs) were prepared by injection chemical vapor deposition and attempted as the reinforcement materials in the SiC coating. After incorporating CNTs, the hardness and elastic modulus of the SiC coating increased by 26.37% and 28.23%, respectively. The interface Bonding Strength between SiC coating and C/C–ZrC–SiC composites was enhanced by 53.31%. The mass loss of the SiC coated C/C–ZrC–SiC composites after thermal shock between 1773 K and room temperature for 15 times decreased from 5.98% to 1.98%. The incorporation of CNTs can effectively improve the toughness, interface Bonding Strength and thermal shock resistance of SiC coating due to the nanoscale toughening mechanism of CNTs by pullout, bridging and crack deflection.
improvement of the Bonding Strength and the oxidation resistance of sic coating on c c composites by pre oxidation treatmentSurface & Coatings Technology, 2014Co-Authors: Yucai Shan, Qiangang Fu, Hejun Li, Qi Fang, Ran Zhao, Pengfei ZhangAbstract:
Abstract To improve the Bonding Strength and the oxidation resistance of SiC coating by chemical vapor deposition (CVD) for carbon/carbon (C/C) composites, C/C composites were modified by pre-oxidation treatment. It is found that an inlaid transition structure was obtained at the interface between SiC coating and pre-oxidized C/C composites. After pre-oxidation treatment, the interface adhesion Strength increases from 23.5 ± 3.2 to 37 ± 2.5 N, and the weight loss of the coated C/C samples is only 0.50% after oxidation at 1773 K for 12 h. The obvious improvement of the Bonding Strength and the oxidation resistance was mainly attributed to the pre-oxidation of the C/C substrate, forming an inlaid transition layer at the C/C–SiC interface during CVD process.
Hala Zreiqat – 2nd expert on this subject based on the ideXlab platform
plasma sprayed catisio5 ceramic coating on ti 6al 4v with excellent Bonding Strength stability and cellular bioactivityJournal of the Royal Society Interface, 2009Co-Authors: Chengtie Wu, Yogambha Ramaswamy, Guocheng Wang, Hala ZreiqatAbstract:
Novel Ca-Si-Ti-based sphene (CaTiSiO5) ceramics possess excellent chemical stability and cytocompatibility. The aim of this study was to prepare sphene coating on titanium alloy (Ti-6Al-4V) for orthopaedic applications using the plasma spray method. The phase composition, surface and interface microstructure, coating thickness, surface roughness and Bonding Strength of the plasma-sprayed sphene coating were analysed using X-ray diffraction, scanning electron microscopy, atomic force microscopy and the standard mechanical testing of the American Society for Testing and Materials, respectively. The results indicated that sphene coating was obtained with a uniform and dense microstructure at the interface of the Ti-6Al-4V surface and the thickness and surface roughness of the coating were approximately 150 and 10 μm, respectively. Plasma-sprayed sphene coating on Ti-6Al-4V possessed a significantly improved Bonding Strength and chemical stability compared with plasma-sprayed hydroxyapatite (HAp) coating. Plasma-sprayed sphene coating supported human osteoblast-like cell (HOB) attachment and significantly enhanced HOB proliferation and differentiation compared with plasma-sprayed HAp coating and uncoated Ti-6Al-4V. Taken together, plasma-sprayed sphene coating on Ti-6Al-4V possessed excellent Bonding Strength, chemical stability and cellular bioactivity, indicating its potential application for orthopaedic implants.
Edward Yi Chang – 3rd expert on this subject based on the ideXlab platform
influence of residual stress on Bonding Strength and fracture of plasma sprayed hydroxyapatite coatings on ti 6al 4v substrateBiomaterials, 2001Co-Authors: Y C Yang, Edward Yi ChangAbstract:
Six hydroxyapatite coatings (HACs) were plasma sprayed on Ti–6Al–4V substrates by varying the substrate temperatures and the cooling conditions. This study is aimed not only to measure the residual stress of HACs under various conditions, but also to assess the influence of residual stress in HACs on their Bonding Strength. The residual stress and Bonding Strength were measured by XRD “sin2ψ” technique and standard adhesion test (ASTM C-633), respectively. The result of the study clearly established the relationship between Bonding Strength and residual stress. The arguments leading to the above conclusion were discussed in detail. Fractographic analysis indicated that fracture of the system occurred mainly inside the hydroxyapatite coating under lower residual stress; as residual stress increased, fracture tended to occur more easily along the crucial HA–Ti alloy substrate interface. A mechanism was presented for the relationships between residual stress, fracture behaviour and Bonding Strength for the plasma-sprayed hydroxyapatite coatings on Ti–6Al–4V substrate.