Fabrication of Bioactive HA/Ti Composite Coating by Laser Cladding

2007 ◽  
Vol 330-332 ◽  
pp. 569-572 ◽  
Author(s):  
Sen Yang ◽  
Hau Chung Man
Keyword(s):  
Composite Coating ◽  
Laser Cladding ◽  
Biomedical Applications ◽  
Bone Growth ◽  
Niti Alloy ◽  
Experimental Result ◽  
Chemical Compositions ◽  
X Ray ◽  
Metallurgical Bonding

To accelerate the bone growth around a metallic implant and to achieve the mechanical characteristics needed for biomedical applications, a HA/Ti composite coating was produced on NiTi alloy substrate by laser cladding. The chemical compositions, microstructures and surface morphology of the cladded layer were analyzed using energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffractometry (XRD). The experimental results showed that an excellent metallurgical bonding between the coating and the substrate was obtained. Owing to decomposition of HA under irradiation of high power laser, the microstructures in bioceramics coating were mainly composed of CaO, CaTiO3, Ti4P3, and HA phases. In vitro experimental result showed that HA/Ti composite coating made the bioactivity of NiTi alloy improve remarkably, which would promote the bone growth and could restrain Ni ion releasing from NiTi alloy.

Microstructure and Bonding Feature of the Bioceramic Composite Coating Obtained by Nd: YAG Laser Cladding

2007 ◽  
Vol 361-363 ◽  
pp. 697-700
Author(s):  
Ying Chun Wang ◽  
Yan Min Li ◽  
Zhen Min Xu ◽  
Qi Lin Deng ◽  
Jian Guo Li ◽  
...  
Keyword(s):  
Composite Coating ◽  
Laser Cladding ◽  
316L Stainless Steel ◽  
Ceramic Coatings ◽  
Metal Substrate ◽  
Composition Gradient ◽  
X Ray Diffraction ◽  
Calcium Phosphate Ceramic ◽  
X Ray ◽  
Metallurgical Bonding

Undesirable phase and microstructure formation, and poor HAP/metal bonding strength restrict the fabrication technique to obtain HAP and other calcium phosphate ceramic coatings. In this paper a bioceramic composite coating, which includes HAP andβ-Ca2P2O7, was obtained by laser cladding with pre-depositing mixed powders of CaHPO4·2H2O and CaCO3 directly on the 316L stainless steel metal substrate. The phases, microstructure and bonding feature of the bioceramic composite coating are characterized by X-ray diffraction(XRD), scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS). The microstructure of the coating consists of minute granular HAP that is distributed among the overlapped club-shapedβ-Ca2P2O7. Uniform presences of Ca, P and O in bioceramic composite coating supplie necessary elements for the synthesis of HAP andβ-Ca2P2O7. Diffusions inwards of P and O into alloying layer help form the chemical metallurgical bonding and composition gradient distributions are present. a chemical metallurgical bonding was formed between the bioceramic composite coating and metal substrate.

Evaluation of Antibacterial and Antidiabetic Potential of Silver Nanoparticles using Eugenia Uniflora L. Seed Extract

2020 ◽  
Vol 13 (6) ◽  
pp. 5217-5225
Author(s):  
Guru Kumar Dugganaboyana ◽  
Chethankumar Mukunda ◽  
Suresh Darshini Inakanally
Keyword(s):  
Biomedical Applications ◽  
Pathogenic Bacteria ◽  
Seed Extract ◽  
Drug Formulation ◽  
Visible Spectroscopy ◽  
Plant Materials ◽  
X Ray ◽  
Eugenia Uniflora ◽  
Uv Visible

In recent years, green nanotechnology-based approaches using plant materials have been accepted as an environmentally friendly and cost-effective approach with various biomedical applications. In the current study, AgNPs were synthesized using the seed extract of the Eugenia uniflora L. (E.uniflora). Characterization was done using UV-Visible spectroscopy, X-ray diffraction (XRD), scanning electronic microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) analyses. The formation of AgNPs has confirmed through UV-Visible spectroscopy (at 466 nm) by the change of color owing to surface Plasmon resonance. Based on the XRD pattern, the crystalline property of AgNPs was established. The functional group existing in seed of E.uniflora extract accountable for the reduction of Ag+ ion and the stabilization of AgNPs was investigated. The morphological structures and elemental composition was determined by SEM and EDX analysis. With the growing application of AgNPs in biomedical perspectives, the biosynthesized AgNPs were evaluated for their antibacterial and along with their antidiabetic potential. The results showed that AgNPs are extremely effective with potent antidiabetic potential at a very low concentration. It also exhibited potential antibacterial activity against the three tested human pathogenic bacteria. Overall, the results highlight the effectiveness and potential applications of AgNPs in biomedical fields such as in the treatment of acute illnesses as well as in drug formulation for treating various diseases such as cancer and diabetes. It could be concluded that E. uniflora seed extract AgNPs can be used efficiently for in vitro evaluation of their antibacterial and antidiabetic effects with potent biomedical applications.

Synthesis of mussel-inspired polydopamine-gallium nanoparticles for biomedical applications

Nanomedicine ◽  
2021 ◽  
Author(s):  
Jean Valdir Uchôa Teixeira ◽  
Fátima Raquel Azevedo Maia ◽  
Mariana Carvalho ◽  
Rui Reis ◽  
Joaquim Miguel Oliveira ◽  
...  
Keyword(s):  
Cell Proliferation ◽  
Biomedical Applications ◽  
Adipose Derived Stem Cells ◽  
Cell Analysis ◽  
Shell Formation ◽  
X Ray ◽  
Alkali Medium ◽  
Reproducible Method ◽  
Gallium Nanoparticles

Aim: To established a simple, controlled and reproducible method to synthesize gallium (Ga)-coated polydopamine (PDA) nanoparticles (NPs). Materials & methods: PDA NPs were synthesized in alkali medium with posterior Ga shell formation due to ion chelation on the NP surface. Results: The obtained results with energy-dispersive x-ray spectroscopy confirmed the incorporation of Ga on the PDA NP surface. The cytotoxicity of Ga-coated PDA NPs was evaluated in vitro at different concentrations in contact with human adipose-derived stem cells. Further cell analysis also demonstrated the benefit of Ga-coated PDA NPs, which increased the cell proliferation rate compared with noncoated PDA NPs. Conclusion: This study indicated that Ga could work as an appropriate shell for PDA NPs, inducing cell proliferation at the analyzed concentrations.

MICROSTRUCTURE AND WEAR RESISTANCE OF IN-SITU SYNTHESIZED TiB2–TiC/Fe COMPOSITE COATING BY LASER CLADDING

2020 ◽  
pp. 2050046
Author(s):  
TIANWEI YANG ◽  
ZHAOHUI WANG ◽  
SHIHAI TAN ◽  
FU GUO
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Composite Coatings ◽  
X Ray Diffraction ◽  
Mixed Powder ◽  
X Ray ◽  
Material Surfaces ◽  
Metallurgical Bonding ◽  
Steel Surfaces

To increase the strength and wear resistance of material surfaces, various combinations of B4C and 80TiFe powder were mixed into a Fe60 self-fluxing alloy powder; the composite coatings reinforced by TiB2–TiC were successfully prepared on Q235 steel surfaces by laser cladding. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) were used to study the microstructure and chemical and phase composition. Microhardness and wear testers were used to investigate the mechanical properties. The results show that the interfaces of composite coatings and substrate materials are excellent for metallurgical bonding. The block-like TiB2 particles and flower-like TiC particles are uniformly distributed in the cladding coating. When the mass fraction of the mixed powder is 30%, the average microhardness of the coating is approximately 1100 HV[Formula: see text], which is 50% higher than that without the mixed powder, and demonstrates the best wear with a performance twice as better as that of the substrate.

Microstructure and Properties of Laser Cladding Cu-TiB2 Composite Coating on Copper

2012 ◽  
Vol 512-515 ◽  
pp. 639-642 ◽  
Author(s):  
Xiao Qin Guo ◽  
Jing Bo Chen ◽  
Xin Fang Zhang ◽  
Yong Kai Wang ◽  
Rui Zhang
Keyword(s):  
Laser Cladding ◽  
Coating Layer ◽  
Composite Coatings ◽  
Copper Substrate ◽  
Bonding Interface ◽  
X Ray ◽  
Cladding Layer ◽  
Metallurgical Bonding ◽  
Tib2 Particles

Cu-TiB2 composite coatings were in-situ synthesized on the copper substrate by using a Nd: YAG laser. The microstructure of the coating and the bonding interface between the laser cladding layer and the substrate were studied by X-ray and SEM. The microhardness and the wear resisting property were tested. The results show that the TiB2 particles were well-proportioned and spherical existing in the coating layer, the bonding interface between the layer and substrate was metallurgical bonding. The microhardness reaches HV450 and the wear resistance is about 10 times as much as that of Cu substate.

Wear and Morphology Investigation of Cr/WC-Ni Based Composite Coating by Laser Cladding

2014 ◽  
Vol 1061-1062 ◽  
pp. 538-541
Author(s):  
Zhi Hong Dong ◽  
Hong Yuan Fan
Keyword(s):  
Magnetron Sputtering ◽  
Composite Coating ◽  
Laser Cladding ◽  
Die Steel ◽  
Hardness Tester ◽  
Coating Surface ◽  
Metallurgical Bonding ◽  
Spray Technique ◽  
The Matrix ◽  
Hardness Values

Cr/WC-Ni composite coating was prepared on Cr12MoV die steel by thermal spray technique, and then further treated using laser cladding technique. WC powders was coated Cr by D.C. magnetron sputtering method. The structure, composition, hardness, morphology were analyzed and measured by XRD and SEM and hardness tester. Tribological experiments were carried out on an abrasion machine. The results showed thatCr film prevented WC decomposition, and Cr/WC-Ni coating had the higher hardness values compared with WC-Ni coating. After the treatment with the laser cladding, the coating surface was uniform and compact and had no cracks, the boding between the matrix and coating surface had a good metallurgical bonding, and sub-surface showed a higher hardness.

Study of Fe-Ni(Cr) Alloy and Nano-Al2O3 Particles Composite Coating Prepared by Laser Cladding

2006 ◽  
Vol 118 ◽  
pp. 585-590 ◽  
Author(s):  
Yeo Jian Hua ◽  
Zhang Wei ◽  
Gao Ming Xia ◽  
Zhang Qun Li
Keyword(s):  
Composite Coating ◽  
Laser Cladding ◽  
Mechanical Characteristics ◽  
Dendritic Structure ◽  
Processing System ◽  
Wear Property ◽  
Chromium Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Nickel

The experiments of laser cladding Ni-coated nano-Al2O3 powder were made on 2Cr13 stainless steel using 7kW CO2 laser processing system. The microstructure and mechanical characteristics of composite coating were tested by scanning electronic microscope (SEM), X-ray diffraction (XRD), energy dispersion analyzer of X-ray (EDAX) and microhardness tester. The results showed that the composite coating was composed of superfine cellular dendritic structure. The X-ray diffraction data revealed that the cellular grains were composed of nano-Al2O3 particles, iron nickel alloy and iron chromium alloy. The mechanical characteristics of composite coating greatly increased. Compared with parent metal, the average hardness of composite coating increased by 1 time, and its wear property increased by 1.25 times.

Study on WC-Ni60 Complex Coating by High Frequency Induction Cladding

2011 ◽  
Vol 675-677 ◽  
pp. 1299-1302 ◽  
Author(s):  
Xin Wei ◽  
Gui Qin Wang ◽  
Yong Feng Chang ◽  
Chao Liu
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
High Frequency ◽  
Electron Probe ◽  
Bonding Layer ◽  
Alloy Composite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metallurgical Bonding ◽  
High Frequency Induction

In this paper, WC-Ni60 alloy composite coating with different contents of WC particles was prepared on the 45steel substrate by high frequency induction cladding. The Composition and microstructure were characterized by X-ray diffraction (XRD) and electron probe X-ray microanalysis (EPMA), the abradability and hardness were tested by UMT-2 tribometer and HV-50A durometer, respectively. The results showed that the hardness and wear resistance of coating were enhanced with the increasing of WC content. WC-Ni60 coating obtained the best wear resistance with the content of 50% WC. The hardness of the coating got the highest when the content of WC was 60%, but wear resistance decreased. The WC-Ni60 coating was reinforced for various hard phases and the metallurgical bonding layer about 10μm was formed between coating and 45steel substrate.

scholarly journals Investigation on Nano-Self-Lubricant Coating Synthesized by Laser Cladding and Ion Sulfurization

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Meiyan Li ◽  
Bin Han ◽  
Conghua Qi ◽  
Yong Wang ◽  
Lixin Song
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Dendritic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Force ◽  
Valence States ◽  
Microstructure Morphology ◽  
Better Than

The composite processing between laser cladding and low temperature (300°C) ion sulfurization was applied to prepare wear resistant and self-lubricating coating. The microstructure, morphology, phase composition, valence states, and wear resistance of the composite coating were investigated by scanning electron microscopy (SEM), atomic force microscope (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), and friction and wear apparatus. The results indicate that the laser cladding Ni-based coatings and the maximum hardness of 46.5 HRC were obtained when the percent of pure W powder was 10%, composed of columnar dendrites crystals and ultrafine dendritic structure. After ion sulfurization at 300°C for 4 h, the loose and porous composite coating is formed with nanograins and the granularity of all grains is less than 100 nm, which consists ofγ-(Fe, Ni), M23C6carbides, FeS, FeS2, and WS2. Furthermore, the wear resistance of the composite coating is better than the laser cladding Ni55 + 10%W coating, and the friction coefficient and mass losses under the conditions of dry and oil lubrication are lower than those of laser cladding Ni55 + 10%W coating.

scholarly journals Engineering of Chitosan-Hydroxyapatite-Magnetite Hierarchical Scaffolds for Guided Bone Growth

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2321 ◽  
Author(s):  
Pistone ◽  
Celesti ◽  
Piperopoulos ◽  
Ashok ◽  
Cembran ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Bone Growth ◽  
Cell Attachment ◽  
X Ray Diffraction ◽  
Culture Studies ◽  
X Ray ◽  
Support Cell ◽  
Chitosan Matrix

Bioabsorbable materials have received increasing attention as innovative systems for the development of osteoconductive biomaterials for bone tissue engineering. In this paper, chitosan-based composites were synthesized adding hydroxyapatite and/or magnetite in a chitosan matrix by in situ precipitation technique. Composites were characterized by optical and electron microscopy, thermogravimetric analyses (TGA), x-ray diffraction (XRD), and in vitro cell culture studies. Hydroxyapatite and magnetite were found to be homogeneously dispersed in the chitosan matrix and the composites showed superior biocompatibility and the ability to support cell attachment and proliferation; in particular, the chitosan/hydroxyapatite/magnetite composite (CS/HA/MGN) demonstrated superior bioactivity with respect to pure chitosan (CS) and to the chitosan/hydroxyapatite (CS/HA) scaffolds

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