Stable pure monocline zirconium oxide coating in low-temperature, production method and application thereof

A low-temperature stable, zirconia technology, used in coatings, metal material coating processes, fusion spraying, etc.

Inactive Publication Date: 2008-07-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far there is no report about plasma sprayed monoclinic zirconia coating used as bioactive coating

Method used

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  • Stable pure monocline zirconium oxide coating in low-temperature, production method and application thereof
  • Stable pure monocline zirconium oxide coating in low-temperature, production method and application thereof
  • Stable pure monocline zirconium oxide coating in low-temperature, production method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The monoclinic ZrO used 2 The chemical composition of the raw material is as shown in Table 1. It is produced by Pan-Meiya (Jiujiang) High-Tech Materials Co., Ltd., and the preparation process of the coating is as follows:

[0030] 1) Calcination of zirconia powder

[0031] The zirconia powder is sintered in the atmosphere, the sintering parameters are as follows, heating rate: 5°C / min, sintering temperature: 1550°C, holding time: 12h. After the sintered powder is ball milled, the powder between 80 mesh and 180 mesh is sieved, the powder particle size ranges from 83 to 198 μm, and the sintered powder is composed of monoclinic phase. (figure 1)

[0032] 2) Coating preparation

[0033] Zirconia coatings were prepared on cleaned and sandblasted titanium alloy substrates by atmospheric plasma spraying. Spraying parameters are listed in Table 4. The coating after spraying is still composed of monoclinic zirconia (Figure 2), and the surface of the coating is dense withou...

Embodiment 2

[0037] The pre-fired powder in Example 1 was ground and passed through an 80-mesh sieve, and the sieve residue was taken as the original powder for plasma spheroidization. The zirconia powder was sprayed into deionized water by plasma spraying technology to obtain zirconia powder with good spheroidization effect, and the spheroidization parameters are shown in Table 5. The coating preparation method and process are the same as in Example 1. The crystal phase of the coating is monoclinic zirconia. The bonding strength of the zirconia coating prepared with spheroidized powder and the titanium alloy substrate is about 40MPa measured by ASTM 633-79 method, which shows that the plasma spheroidization process can significantly improve the bonding strength of the coating and the substrate. In addition, the coating can well induce the deposition of hydroxyapatite in simulated body fluid, and has excellent biological activity.

[0038] Table 5 Plasma spheroidization parameters

[00...

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Abstract

The invention relates to a pure monoclinic zirconia coating which is stable at low temperature, a preparation method thereof and application thereof. The invention is characterized in that titanium alloy is used as a matrix; the zirconia coating is composed of monoclinic zirconia which is stable at low temperature, specifically, lower than 100 DEG C and equal to or high than the temperature province of human body environment. The zirconia coating which is stable at the low temperature is characterized in that: the binding strength of the zirconia coating and the titanium alloy is between 20 and 40MPa; the zirconia coating has a dense surface without crackles; market monoclinic zirconia powder is adopted as raw material, pretreated with ball mill, and spheroidized or not spheroidized, and then the monoclinic zirconia coating being stable at low temperature is prepared by directly adopting a plasma spraying process. The provided coating has excellent biological activity, can stably exist in body environment, and is used as a surface coating of artificial implants. The surface of the coating can induce the formation of bone-like apatite in simulated body fluid.

Description

technical field [0001] The present invention relates to a stable pure monoclinic zirconia coating at low temperature, its preparation method and its application. The low temperature is a temperature range lower than 100°C and equal to or higher than the environment in the human body. It belongs to the field of medical biomaterials. Background technique [0002] Plasma-sprayed bioactive hydroxyapatite coatings have been widely used clinically, but because they are easily dissolved in the human body by reacting with body fluids, the bonding strength with titanium alloy substrates is also low [FazanF, Marquis PM, dissolution behavior of plasma -sprayed hydroxyapatite coatings, J.Mater.Sci.: Mater.Med., 2000; 11:787-92], there is still the risk of degradation and peeling after implantation in the human body. [0003] Zirconia ceramics have the advantages of excellent biocompatibility, good fracture strength, and elastic modulus matching stainless steel. It has received extensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/30C23C4/10C23C4/11C23C4/134
Inventor 王国成刘宣勇丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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