How to spray nano-hydroxyapatite (HAp) powder
12-24-2014, 10:51 AM,
#1
Lightning  How to spray nano-hydroxyapatite (HAp) powder
I want to deposit nano-HAp coating for bio-implants. While spraying with plasma the phase transformation takes place at 1000 °C and complete melting occurs at 1650 °C. Also these coatings work with high porosity > 10% as porous voids allow the body tissues to penetrate and to grow.
So can anyone suggest me how to deposit this coating by other process with least transformation and high porosity. I think cold spray can overcome the problem of transformation but how will I get high porosity.
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12-24-2014, 06:30 PM,
#2
RE: How to spray nano-hydroxyapatite (HAp) powder
You need low particle velocity combined with low combustion temperature and/or short dwell time in the flame. You can also increase your stand-off distance to increase coating porosity. HVAF would be a good alternative to cold spray. Contact me off-line if you would like to investigate this.
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12-24-2014, 07:42 PM, (This post was last modified: 12-24-2014, 07:57 PM by Met.Eng..)
#3
RE: How to spray nano-hydroxyapatite (HAp) powder
you can to use "solutions suspension system". I have lats of articles about this nano particular HVOF coatings. I remember that you can spray nano HAP with HVOF. And the results are wery good. If you want i will send you some articles by email.


Regards


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12-25-2014, 10:48 AM,
#4
RE: How to spray nano-hydroxyapatite (HAp) powder
Dear Met.Eng,

Please share paper with me, send them at
lalitthakur@nitkkr.ac.in . Thanks in advance
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12-28-2014, 01:09 PM,
#5
RE: How to spray nano-hydroxyapatite (HAp) powder
(12-24-2014, 10:51 AM)Lalit Wrote: I want to deposit nano-HAp coating for bio-implants. While spraying with plasma the phase transformation takes place at 1000 °C and complete melting occurs at 1650 °C. Also these coatings work with high porosity > 10% as porous voids allow the body tissues to penetrate and to grow.
So can anyone suggest me how to deposit this coating by other process with least transformation and high porosity. I think cold spray can overcome the problem of transformation but how will I get high porosity.


Dear Sir
PLS look:
https://www.youtube.com/watch?v=dZUoWk-QuVs

But the main is that the coat by HVOF is simple. The most important post-processing required to give the desired structure.
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12-28-2014, 08:49 PM,
#6
RE: How to spray nano-hydroxyapatite (HAp) powder
Dear Met.Eng,

Please share paper with me, send them at
davidkien68@gmail.com . Thanks in advance
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12-30-2014, 06:38 PM,
#7
RE: How to spray nano-hydroxyapatite (HAp) powder
(12-28-2014, 08:49 PM)davidkien68 Wrote: Dear Met.Eng,

Please share paper with me, send them at
davidkien68@gmail.com . Thanks in advance

Ok I will send u
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