Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants

Biomedical requirements in a prosthesis are often complex and diverse in nature. Biomaterials for implants have to display a wide range of adaptability to suit the various stages of the bio-integration process of any foreign material into the human body. Often, a combination of materials is needed....

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Main Authors: Wang, Ying, Khor, Khiam Aik, Cheang, Philip
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/87896
http://hdl.handle.net/10220/45564
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-878962023-03-04T17:16:38Z Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants Wang, Ying Khor, Khiam Aik Cheang, Philip School of Mechanical and Aerospace Engineering Calcium Phosphates A-tricalcium Phosphate DRNTU::Engineering::Mechanical engineering DRNTU::Engineering::Materials::Biomaterials Biomedical requirements in a prosthesis are often complex and diverse in nature. Biomaterials for implants have to display a wide range of adaptability to suit the various stages of the bio-integration process of any foreign material into the human body. Often, a combination of materials is needed. The preparation of a functionally graded bioceramic coating composed of essentially calcium phosphate compounds is explored. The coating is graded in accordance to adhesive strength, bioactivity, and bioresorbability. The bond coat on the Ti-6Al-4V stub is deposited with a particle range of the hydroxyapatite (HA) that will provide a high adhesive strength and bioactivity but have poor bioresorption properties. The top coat, however, is composed of predominantly a-tricalcium phosphate (a-TCP) that is highly bioresorbable. This arrangement has the propensity of allowing accelerated bio-integration of the coating by the body tissues as the top layer is rapidly resorbed, leaving the more bioactive intermediate layer to facilitate the much needed bioactive properties for proper osteoconduction. The processing steps and problems are highlighted, as well as the results of post-spray heat treatment. Published version 2018-08-15T04:09:28Z 2019-12-06T16:51:39Z 2018-08-15T04:09:28Z 2019-12-06T16:51:39Z 1998 Journal Article Wang, Y., Khor, K. A., & Cheang, P. (1998). Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants. Journal of Thermal Spray Technology, 7(1), 50-57. 1059-9630 https://hdl.handle.net/10356/87896 http://hdl.handle.net/10220/45564 10.1007/s11666-006-5003-9 en Journal of Thermal Spray Technology © 1998 ASM International.This paper was published in Journal of Thermal Spray Technology and is made available as an electronic reprint (preprint) with permission of ASM International. The published version is available at: [http://dx.doi.org/10.1007/s11666-006-5003-9]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 8 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Calcium Phosphates
A-tricalcium Phosphate
DRNTU::Engineering::Mechanical engineering
DRNTU::Engineering::Materials::Biomaterials
spellingShingle Calcium Phosphates
A-tricalcium Phosphate
DRNTU::Engineering::Mechanical engineering
DRNTU::Engineering::Materials::Biomaterials
Wang, Ying
Khor, Khiam Aik
Cheang, Philip
Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants
description Biomedical requirements in a prosthesis are often complex and diverse in nature. Biomaterials for implants have to display a wide range of adaptability to suit the various stages of the bio-integration process of any foreign material into the human body. Often, a combination of materials is needed. The preparation of a functionally graded bioceramic coating composed of essentially calcium phosphate compounds is explored. The coating is graded in accordance to adhesive strength, bioactivity, and bioresorbability. The bond coat on the Ti-6Al-4V stub is deposited with a particle range of the hydroxyapatite (HA) that will provide a high adhesive strength and bioactivity but have poor bioresorption properties. The top coat, however, is composed of predominantly a-tricalcium phosphate (a-TCP) that is highly bioresorbable. This arrangement has the propensity of allowing accelerated bio-integration of the coating by the body tissues as the top layer is rapidly resorbed, leaving the more bioactive intermediate layer to facilitate the much needed bioactive properties for proper osteoconduction. The processing steps and problems are highlighted, as well as the results of post-spray heat treatment.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Wang, Ying
Khor, Khiam Aik
Cheang, Philip
format Article
author Wang, Ying
Khor, Khiam Aik
Cheang, Philip
author_sort Wang, Ying
title Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants
title_short Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants
title_full Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants
title_fullStr Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants
title_full_unstemmed Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants
title_sort thermal spraying of functionally graded calcium phosphate coatings for biomedical implants
publishDate 2018
url https://hdl.handle.net/10356/87896
http://hdl.handle.net/10220/45564
_version_ 1759853855379554304