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Optimierung der dielektrischen Eigenschaften von Suspensions Plasma . gespritzten Hydroxylapatit‐Beschichtungen
Author(s) -
Jaworski R.,
Pierlot C.,
Tomaszek R.,
Pawlowski L.,
Znamirowski Z.,
Zdanowski J.
Publication year - 2007
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200600120
Subject(s) - suspension (topology) , materials science , distilled water , volumetric flow rate , composite material , aluminium , plasma , plasma torch , chromatography , chemistry , physics , mathematics , quantum mechanics , homotopy , pure mathematics
Conventional plasma torch was adapted to spray very fine Ca 5 (PO 4 ) 3 OH (hydroxyapatite, HA) precursors having sizes ranging from a few hundreds of nanometers to a few micrometers. The powders were put in suspension with distilled water and antidispersive agent. A home made suspension feeder, including two peristaltic pumps, delivered the suspension into atomizer and therefrom injected into plasma jet. The suspension flow rate was electronically controlled. The resulting coatings had the thickness of a few tenths of μm. The electrical properties of the coatings including breakdown voltage and loss factor of suspension sprayed hydroxyapatite coatings sprayed onto aluminium substrates were also tested. The influence of such experimental factors as power input to plasma, pressure of atomizing gas, spray distance and suspension feed rate on the responses being the electrical properties was investigated using a 2 4 design of experiments (DOE). The mathematical models relating the responses with the factors were created and the significant factors were selected.