Effect of post vacuum heating on the microstructural feature and bonding strength of plasma-sprayed hydroxyapatite coatings

Chung Wei Yang, Tzer Min Lee, Truan Sheng Lui, Edward Chang

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Plasma-sprayed HA coatings (HACs) on Ti-6Al-4V substrate with post vacuum heating treatment were employed to improve the properties of HACs. The heating temperatures are 400, 500, 600, 700 and 800 °C. According to the experimental results, post vacuum heating treatment could improve the average bonding strength and the minimum strength of HACs by using Weibull's reliability analysis. The HACs with 600 °C vacuum heating shows the highest strength value of all. On the other hand, the index of crystallinity (IOC) of heat-treated HACs increases and impurity phase content decreases with increasing heating temperature. The crystallization during vacuum heating also leads the variation in thermal expansion coefficient and the volume contraction of heat-treated HACs, especially at higher than that of 600 °C vacuum heating. Therefore, the volume contraction induces apparent and concentrated large cracks and reduces the bonding strength of heat-treated HACs.

Original languageEnglish
Pages (from-to)1395-1400
Number of pages6
JournalMaterials Science and Engineering C
Volume26
Issue number8
DOIs
Publication statusPublished - 2006 Sep 1

Fingerprint

sprayed coatings
Durapatite
Hydroxyapatite
Vacuum
Plasmas
Heating
Coatings
vacuum
heating
coatings
heat
contraction
reliability analysis
Sprayed coatings
Reliability analysis
Crystallization
high strength
Thermal expansion
thermal expansion
crystallinity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "Plasma-sprayed HA coatings (HACs) on Ti-6Al-4V substrate with post vacuum heating treatment were employed to improve the properties of HACs. The heating temperatures are 400, 500, 600, 700 and 800 °C. According to the experimental results, post vacuum heating treatment could improve the average bonding strength and the minimum strength of HACs by using Weibull's reliability analysis. The HACs with 600 °C vacuum heating shows the highest strength value of all. On the other hand, the index of crystallinity (IOC) of heat-treated HACs increases and impurity phase content decreases with increasing heating temperature. The crystallization during vacuum heating also leads the variation in thermal expansion coefficient and the volume contraction of heat-treated HACs, especially at higher than that of 600 °C vacuum heating. Therefore, the volume contraction induces apparent and concentrated large cracks and reduces the bonding strength of heat-treated HACs.",
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Effect of post vacuum heating on the microstructural feature and bonding strength of plasma-sprayed hydroxyapatite coatings. / Yang, Chung Wei; Lee, Tzer Min; Lui, Truan Sheng; Chang, Edward.

In: Materials Science and Engineering C, Vol. 26, No. 8, 01.09.2006, p. 1395-1400.

Research output: Contribution to journalArticle

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AB - Plasma-sprayed HA coatings (HACs) on Ti-6Al-4V substrate with post vacuum heating treatment were employed to improve the properties of HACs. The heating temperatures are 400, 500, 600, 700 and 800 °C. According to the experimental results, post vacuum heating treatment could improve the average bonding strength and the minimum strength of HACs by using Weibull's reliability analysis. The HACs with 600 °C vacuum heating shows the highest strength value of all. On the other hand, the index of crystallinity (IOC) of heat-treated HACs increases and impurity phase content decreases with increasing heating temperature. The crystallization during vacuum heating also leads the variation in thermal expansion coefficient and the volume contraction of heat-treated HACs, especially at higher than that of 600 °C vacuum heating. Therefore, the volume contraction induces apparent and concentrated large cracks and reduces the bonding strength of heat-treated HACs.

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