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激光熔覆梯度生物陶瓷涂层的研究

Study on Graded Bioceramic Coating Cladded by Laser Beam

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摘要

钛合金表面涂覆羟基磷灰石(HA)用作硬组织植入体,既有优良的力学性能,又有优良的生物相容性,是材料学和生物医学中的研究热点。基于CaCO3+CaHPO3?2H2O在高温下能反应生成羟基磷灰石,以及激光熔覆技术能够制备与基体材料结合良好的陶瓷涂层的事实,尝试了利用激光处理在钛合金表面同步合成与熔覆羟基磷灰石生物陶瓷涂层的新技术。实验表明,以80CaCO3-20CaHPO3?2H2O,另加1%Y2O3为原料,在功率密度13~15 W/mm2,扫描速度630 mm/min的处理条件下,在TC4钛合金表面成功地制备出以羟基磷灰石为主的、具有梯度特征的生物陶瓷涂层。该涂层由表及里钙含量逐渐减少,钛、钇递增,磷则是先增加后减少;致密度由表及里呈现出逐步提高的特征;显微硬度则逐渐降低。

Abstract

Titanium alloy with hydroxyapatite (HA) coating, which has excellent mechanical properties and biocompatibility, is a promising artificial implant. In material and biomedical science, many efforts are made to develop this composite. At elevated temperature, CaCO3 reacts with CaHPO3?2H2O to form HA. And laser-melting technique can produce ceramic coatings well bonded with substrate. So the experiment on synthesizing and cladding HA coating on TC4 surface can be made, simultaneously. 80CaCO3-20CaHPO3?2H2O with 1% Y2O3 in addition are used as raw materials. As laser treatment, the power density is 13~15 W/mm2 and the scanning rate is 630 mm/min. A graded bioceramic coating is cladded on Ti6Al4V, which mainly consists of HA. In this coating, as the depth increasing calcium content decreases, but titanium and yttrium change contrarily. The distribution of phosphorus is complex to increase followed by decrease. The porosity decreases from surface to substrate, which is similar to the distribution of micro-hardness.

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中图分类号:TB 333;TN 249

所属栏目:激光制造

基金项目:国家自然科学基金(59571045)资助课题

收稿日期:2002-09-06

修改稿日期:2002-09-06

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作者单位    点击查看

王勇:重庆大学材料科学与工程学院, 重庆 400044
高家诚:重庆大学材料科学与工程学院, 重庆 400044
张亚平:重庆大学材料科学与工程学院, 重庆 400044

联系人作者:王勇(liuzhi@cqu.edu.cn)

备注:王勇(1968―),男,四川乐至人,重庆大学材料科学与工程学院副教授,博士,主要从事生物材料及粉末冶金的研究。

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【2】2 Gao Jiacheng, Zhang Yaping, Wen Jing et al.. Laser surface coating of RE bioceramic layer on TC4 [J]. Trans. Nonferroous Met. Soc. China, 2000, 10(4):477~480

【3】3 Wang Yong. Synthesizing and Cladding Re-Bioceramic Composite Coating on Titanium Alloy with Laser Beam [D]. Ph. D. Dissertation of Chongqing University, 2002
王勇. 钛合金表面激光合成与熔覆稀土生物陶瓷复合涂层的研究[D]. 重庆大学博士学位论文, 2002

【4】4 Gao Jiacheng, Zhang Yaping, Chen Mingfei. Thermodynamic and dynamics of laser synthesizing HA bioceramic coating [J]. Functional Materials, 1998, 29(6):635~638
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【5】5 Li Shipu, Yan Yuhua. Studies on degradation mechanism and metabolic way of β-TCP ceramics [J]. Chinese Science Fund, 1999, (2):99~100
李世普,阎玉华. β-TCP陶瓷的降解机理和代谢途径研究[J]. 中国科学基金, 1999, (2):99~100

【6】6 Zhang Yaping, Gao Jiacheng, Wen Jing et al.. Biocompatibility of bioceramic coating on TC4 by laser cladding [J]. Chinese Journal of Biomedical Engineering, 2002, 21(3):242~245
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【8】8 G. Carotenuto, G. Spagnuolo, L. Ambrosio et al.. Macroporous hydroxyapatite as alloplastic material for dental applications [J]. J. Mater. Sci. Mater. Med., 1999, 10(10):671~676

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