Publication detail

Role of In-flight Temperature and Velocity of Powder Particles on Plasma Sprayed Hydroxyapatite Coating Characteristics

ČÍŽEK, J. KHOR, K.

Original Title

Role of In-flight Temperature and Velocity of Powder Particles on Plasma Sprayed Hydroxyapatite Coating Characteristics

Type

journal article in Web of Science

Language

English

Original Abstract

This paper presents a systematic research on the process of thermal spraying of HA encompassing all stages of layer deposition: powder production and characterization (optimized production led to spherical 29.29 - 50.51 um powder with 0.0% content of tri-calcium phosphate [TCP] or tetra-calcium phosphate [TTCP] phases), plasma jet properties influence on the in-flight powder properties (major influence of spray distance factor), the influence of the in-flight temperature and velocity of hydroxyapatite powder particles (ranges of 2294 K–2708 K and 152 m/s – 291 m/s) on the final characteristics of the deposited coatings. Six combinations of the system parameters leading the low-medium-high in-flight properties were selected and the respective coatings were investigated, with some data in contradiction to previously published results. It was found that the temperature of the particles plays a critical role for the development of detrimental CaO (content increase of up to 14.6%) and metastable TTCP (up to 49.5%) phases in the coatings. Particle in-flight velocity was found to influence the open porosity of the coatings (8.8%–27.9%) and has an impact on the micro-hardness and moduli of the coatings (relative differences of up to 2.8 times). Joint incidence of both in-flight properties was found to significantly influence the microstructure of the coatings and its respective surface roughness levels (Ra = 7.4–19.4 um). The morphology of impinging splats was found to be influenced by both the in-flight velocity (dominant factor) and temperature (secondary factor) of the HA particles.

Keywords

Plasma spray; In-flight properties; Coating characterization; Hydroxyapatite

Authors

ČÍŽEK, J.; KHOR, K.

RIV year

2012

Released

15. 1. 2012

Publisher

Elsevier

ISBN

0257-8972

Periodical

Surface and Coatings Technology

Year of study

206

Number

8-9

State

Swiss Confederation

Pages from

2181

Pages to

2191

Pages count

11

URL

http://www.sciencedirect.com/science/article/pii/S0257897211009455

Full text in the Digital Library

http://hdl.handle.net/11012/30993

BibTex

@article{BUT89370,
  author="Jan {Čížek} and Khiam Aik {Khor}",
  title="Role of In-flight Temperature and Velocity of Powder Particles on Plasma Sprayed Hydroxyapatite Coating Characteristics",
  journal="Surface and Coatings Technology",
  year="2012",
  volume="206",
  number="8-9",
  pages="2181--2191",
  doi="10.1016/j.surfcoat.2011.09.058",
  issn="0257-8972",
  url="http://www.sciencedirect.com/science/article/pii/S0257897211009455"
}