The Experts below are selected from a list of 130611 Experts worldwide ranked by ideXlab platform
Qiangang Fu - One of the best experts on this subject based on the ideXlab platform.
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Bonding Strength thermal shock and oxidation resistance of interlocking zr hf c sic sic double layer coating for c c composites
Surface & 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.
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effect of carbon nanotubes on the toughness Bonding Strength and thermal shock resistance of sic coating for c c zrc sic composites
Journal 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.
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improvement of the Bonding Strength and the oxidation resistance of sic coating on c c composites by pre oxidation treatment
Surface & 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 - One of the best experts on this subject based on the ideXlab platform.
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plasma sprayed catisio5 ceramic coating on ti 6al 4v with excellent Bonding Strength stability and cellular bioactivity
Journal 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 - One of the best experts on this subject based on the ideXlab platform.
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influence of residual stress on Bonding Strength and fracture of plasma sprayed hydroxyapatite coatings on ti 6al 4v substrate
Biomaterials, 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.
Chengtie Wu - One of the best experts on this subject based on the ideXlab platform.
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clinoenstatite coatings have high Bonding Strength bioactive ion release and osteoimmunomodulatory effects that enhance in vivo osseointegration
Institute of Health and Biomedical Innovation; Science & Engineering Faculty, 2015Co-Authors: Chengtie Wu, Zetao Chen, Qianju Wu, Deliang Yi, Thor Friis, Xuebin Zheng, Jiang ChangAbstract:A number of coating materials have been developed over past two decades seeking to improve the osseointegration of orthopedic metal implants. Despite the many candidate materials trialed, their low rate of translation into clinical applications suggests there is room for improving the current strategies for their development. We therefore propose that the ideal coating material(s) should possess the following three properties: (i) high Bonding Strength, (ii) release of functional ions, and (iii) favourable osteoimmunomodulatory effects. To test this proposal, we developed clinoenstatite (CLT, MgSiO3), which as a coating material has high Bonding Strength, cytocompability and immunomodulatory effects that are favourable for in vivo osteogenesis. The Bonding Strength of CLT coatings was 50.1 ± 3.2 MPa, more than twice that of hydroxyapatite (HA) coatings, at 23.5 ± 3.5 MPa. CLT coatings released Mg and Si ions, and compared to HA coatings, induced an immunomodulation more conducive for osseointegration, demonstrated by downregurelation of pro-inflammatory cytokines, enhancement of osteogenesis, and inhibition of osteoclastogenesis. In vivo studies demonstrated that CLT coatings improved osseointegration with host bone, as shown by the enhanced biomechanical Strength and increased de novo bone formation, when compared with HA coatings. These results support the notion that coating materials with the proposed properties can induce an in vivo environment better suited for osseointegration. These properties could, therefore, be fundamental when developing high-performance coating materials.
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multidirectional effects of sr mg and si containing bioceramic coatings with high Bonding Strength on inflammation osteoclastogenesis and osteogenesis
ACS Applied Materials & Interfaces, 2014Co-Authors: Chengtie Wu, Zetao Chen, Deliang Yi, Jiang Chang, Yin XiaoAbstract:Ideal coating materials for implants should be able to induce excellent osseointegration, which requires several important parameters, such as good Bonding Strength, limited inflammatory reaction, and balanced osteoclastogenesis and osteogenesis, to gain well-functioning coated implants with long-term life span after implantation. Bioactive elements, like Sr, Mg, and Si, have been found to play important roles in regulating the biological responses. It is of great interest to combine bioactive elements for developing bioactive coatings on Ti-6Al-4 V orthopedic implants to elicit multidirectional effects on the osseointegration. In this study, Sr-, Mg-, and Si-containing bioactive Sr2MgSi2O7 (SMS) ceramic coatings on Ti-6Al-4 V were successfully prepared by the plasma-spray coating method. The prepared SMS coatings have significantly higher Bonding Strength (∼37 MPa) than conventional pure hydroxyapatite (HA) coatings (mostly in the range of 15–25 MPa). It was also found that the prepared SMS coatings swit...
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plasma sprayed catisio5 ceramic coating on ti 6al 4v with excellent Bonding Strength stability and cellular bioactivity
Journal 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.
Mitsuru Sakurai - One of the best experts on this subject based on the ideXlab platform.
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Bonding Strength of adhesives and surface roughness of joined parts
Journal of Materials Processing Technology, 2002Co-Authors: Kunio Uehara, Mitsuru SakuraiAbstract:Abstract The Bonding Strength of adhesives is influenced by the surface roughness of the joining parts. However, the magnitude of the influence has not yet been clarified because of the complexity of the phenomena. In this paper, it is found that an optimum value of the surface roughness exists with respect to the tensile Strength of the adhesion. On the other hand, the peel Strength shows no clear relationship with the surface roughness. The shear Strength of the adhesion lies in the middle of the above two tendencies.
