Method for suspending liquid plasma spraying preparation of hydroxyapatite bioactivity coatings

A technology of hydroxyapatite and biological activity, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of increased production cost, low production efficiency, uneven coating structure, etc., and achieve saving Energy, production efficiency improvement, production cost reduction effect

Inactive Publication Date: 2008-08-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the raw material for plasma spraying generally needs to go through a series of cumbersome process links such as wet chemical synthesis, aging, spray drying, powder granulation and spheroidization, calcining, crushing, ball milling, and sieving, which leads to low production efficiency and low production efficiency. cost increase
Secondly, in powder plasma spraying, solid powder particles are easy to gather together to form "clusters" of different shapes and sizes. Formation of a bioactive coating of hydroxyapatite on the surface of a metal substrate, resulting in structurally inhomogeneous defects in the coating

Method used

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  • Method for suspending liquid plasma spraying preparation of hydroxyapatite bioactivity coatings
  • Method for suspending liquid plasma spraying preparation of hydroxyapatite bioactivity coatings
  • Method for suspending liquid plasma spraying preparation of hydroxyapatite bioactivity coatings

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preparation example Construction

[0039] (1) Preparation of hydroxyapatite suspension;

[0040] (2) Transmission of hydroxyapatite suspension;

[0041] (3) injection of hydroxyapatite suspension;

[0042] (4) Generation of hydroxyapatite bioactive coating.

[0043] figure 2 Among them, the device provided by the method of the present invention adopts a direct current plasma spraying equipment, and the plasma spray gun 8 is connected to the fixed seat 22, and an adjusting bracket 18 is installed on the fixing seat, and an adjusting bracket that can slide along the horizontal direction is installed on the adjusting bracket. The adjustment slide block 17 that is matched and connected, the small-diameter conduit 20 is installed under the adjustment slide block.

[0044] When the compressed air charged in the pressure tank 12 is used as the transmission power of the hydroxyapatite suspension 3 in the transmission system, the third valve 16 is closed, and the first valve 11 on the pressure-resistant pipe 2 and t...

Embodiment 1

[0048] according to image 3 The shown device structure is arranged and each component is connected. In the present embodiment, the plasma flame 7 ejected by the plasma spray gun 8 is generated by the DC plasma spraying equipment used. The spraying power is 20 kilowatts, and the metal base 6 is biomedical titanium metal. The distance between the titanium metal and the plasma spray gun is 8 centimeters, and the pressure vessel used is a pressure tank 12.

[0049] First prepare hydroxyapatite suspension 3, according to calcium phosphorus molar ratio 1.67, configuration molar concentration is the calcium nitrate aqueous solution of 0.5mol / L and the diammonium hydrogen phosphate aqueous solution that molar concentration is 0.5mol / L; Under constant stirring, will The diammonium hydrogen phosphate aqueous solution of configuration is added dropwise in the calcium nitrate aqueous solution with 5ml / min rate and reacts, and then the ammoniacal liquor of percentage concentration 10% is ...

Embodiment 2

[0051] according to image 3 The shown device structure is arranged and connected to each component. In the present embodiment, the plasma flame 7 is produced by the DC plasma spraying equipment used, and its spraying power is 30 kilowatts. The metal base 6 is a biomedical titanium alloy, and the titanium alloy and the plasma nozzle The distance is 10 centimeters, and the pressure vessel used is a pressure tank 12.

[0052] First prepare the hydroxyapatite suspension 3, according to the calcium-phosphorus molar ratio of 1.67, configure the calcium nitrate aqueous solution with a molar concentration of 2.5mol / L and the diammonium hydrogen phosphate aqueous solution with a molar concentration of 3mol / L; The diammonium hydrogen phosphate aqueous solution is added dropwise in the calcium nitrate aqueous solution with 15ml / min speed to react, and then the ammoniacal liquor of percentage concentration 30% is added dropwise in the reaction solution with 20ml / min speed, and the contro...

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Abstract

The invention relates to a method for spraying suspending liquid plasma to prepare hydroxyapatite bioactive coating, which comprises following steps: adopting hydroxyapatite suspending liquid as plasma spraying raw materials, adopting a pressure tank or an electronic peristaltic pump as a power transmitting device to transmit the hydroxyapatite suspending liquid, adopting an atomizing nozzle with a small angle to inject the hydroxyapatite suspending liquid into a central region of plasma flame directly and radially or adopting a duct with small diameter to inject the hydroxyapatite suspending liquid into the central region of the plasma flame directly and radially in a linear type jet-flow mode, exchanging heat between the suspending liquid and high temperature plasma flame through transmitting and injecting the suspending liquid, and directly generating the hydroxyapatite bioactive coating on the surface of a biological medical metal base through vaporizing liquid in the suspending liquid, crushing particles, smelting and depositing. The method simplifies a tedious technological link for preparing the spraying raw materials in a method for spraying powder plasma, the spraying raw materials and energy are saved, and the structural homogeneity of the hydroxyapatite bioactive coating which is prepared is good.

Description

technical field [0001] The invention relates to a preparation technology of a hydroxyapatite bioactive coating, in particular to a suspension plasma spraying of a hydroxyapatite suspension as a spraying raw material and a biomedical metal as a base material to prepare hydroxyphosphorus The invention discloses a new method of limestone bioactive coating, which belongs to the technical field of preparation of biomedical materials. Background technique [0002] Hydroxyapatite is the main inorganic phase component of human hard tissues such as bones and teeth, and has good biological activity and biocompatibility. However, due to its low flexural strength and fracture toughness, hydroxyapatite has poor fatigue resistance in physiological environments, so it cannot be used alone for hard tissue repair and replacement of load-bearing parts. Biomedical metals are often biologically inert materials, without biological activity, and cannot form direct chemical bonds with tissues aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04A61L27/04
Inventor 吴方黄毅刘晓光吴尧肖严峰宋磊陈继镛
Owner SICHUAN UNIV
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