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Method for coating a substrate with calcuim phosphate

A technology of calcium phosphate and monocalcium phosphate, applied in application, coating, liquid chemical plating, etc., can solve problems such as impossible formation

Inactive Publication Date: 2005-07-06
NEW YORK CITY DEPARTMENT OF TRANSPORTATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is firstly that the coating takes place in two steps
Another disadvantage is that it is not possible to form layer thicknesses in the desired range with the two-step process, so that for thick coatings the known method also provides an additional step in which the substrate coated with the calcium phosphate layer is immersed in phosphoric acid in calcium solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Add the phosphoric acid solution to the calcium hydroxide solution with constant stirring. The fine precipitate thus formed was concentrated by centrifugation and separated from the supernatant clear solution. Add the previously degreased and washed titanium particles to the calcium phosphate gel thus obtained and mix thoroughly. Place this mixture in a negative pressure chamber. Air is removed from the pores of the titanium particles under the application of suitable negative pressure. During the next ventilation, calcium phosphate gel seeps into the small pores. The coated granules are dried, separated and separated from the falling calcium phosphate granules by sieving. The coating thickness of calcium phosphate is variable and can be adjusted by the concentration of the resulting gel.

example 2

[0015] Any calcium phosphate powder mixed with a silica gel. Add degreased and cleaned titanium particles to the gel and mix well. The air in the pores of the titanium particles was removed as in Example 1. In order to allow the calcium phosphate-silica-gel to penetrate into the small pores during ventilation. The coated particles are dried, separated and separated from the deposited calcium phosphate-silica particles by means of an air stream. Calcium phosphate-silicate coating thickness can be adjusted by gel concentration.

example 3

[0017] Add any calcium phosphate powder to a hydrocolloid of an alkoxysilane (such as TEOS) hydrolyzate and distribute it evenly by stirring. Then add a titanium powder or particles of any particle size to this colloidal solution while continuing to stir, and after thorough mixing begin to carefully distill off the solvent under constant motion. The finish of the coating is characterized by the pourability of the titanium particles and the formation of a crack-free film directly on the substrate surface. Finally the coated substrate is heat treated in stages to 150°C.

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PUM

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Abstract

Process for coating a substrate with calcium phosphate comprises applying a calcium phosphate gel to the substrate, drying the coated substrate and removing calcium phosphate particles. An Independent claim is also included for a substrate coated as above for use as a bone substitute.

Description

technical field [0001] The invention relates to a method for coating a substrate with a calcium phosphate layer. Background technique [0002] In order to coat the substrate, in particular with a biologically active calcium phosphate layer such as hydrocarbyl apatite, the plasma spraying method is used. However, this method is not suitable if the substrate consists of small particles or is not resistant to heat. Electrochemical deposition of calcium phosphate also cannot be used with particles, even if the particles are electrically conductive. [0003] In US-PS 6,153,266 a method for forming a calcium phosphate coating is described, wherein in a first step the substrate is immersed in a phosphate-containing solution, which does not contain calcium, and the substrate is subsequently removed from the solution and dried and immersed in a second solution having a pH of 8 and containing calcium, in which solution calcium phosphate is formed on the surface of the substrate. A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/00A61F2/00A61F2/28A61F2/30A61L24/02A61L27/32C23C18/00C23C20/08C23C24/08C23C30/00
CPCA61F2/28A61F2/30767A61F2310/00023A61F2310/00796A61F2310/0097A61F2310/00976A61L24/02A61L27/32C23C18/00C23C24/08C23C30/00A61L2430/02
Inventor P·贝克尔M·布尔梅斯特H-G·诺伊曼M·特勒
Owner NEW YORK CITY DEPARTMENT OF TRANSPORTATION