NiTi合金表面激光熔覆TiHA复合涂层的研究
关键词：镍钛合金 羟基磷灰石 激光熔覆 生物陶瓷涂层毕业设计说明书（论文）外文摘要
Title The study of laser cladding Ti/HA composite coating on the surface of NiTi alloy.
Abstract
Nickel titanium alloy is typical of the shape memory alloy. It has high mechanical strength and anti-fatigue properties, so it was used as a biomedical metal materials. However, due to its bad biological activities which is far from the demand of living organisms, this issue becomes a hot spot on the field of the application development research. The high biocompatibility and biodegradability of Hydroxyapatite(HA)drive it into a representative of the biological activity material, which enables people to pay much attention to the fields of modern biomedical engineering. But it is a ceramic phase,its low strength and brittleness become the main factors to limit its development. Therefore, the combination of the both materials is inevitable. Preparation of hydroxyapatite biological coating on the surface of the NiTi substrate can synthesize their advantages and abolish their disadvantages .It not only retains the excellent mechanical properties but also gains the good biological activity , so this combination method broaden the horizons for the prospect of hard tissue material. In this paper,we will prepare Ti/HA composite coating on the surface of NiTi alloy using laser cladding technology,and analyse composition and organizational structure of the cladding layer material by using X-ray diffraction and scanning electron microscopy. Results show that obtaining hydroxyapatite coating on the surface of NiTi alloy is prospective by laser cladding technology.Both the scanning speed and laser power attach to laser cladding parameters are also exploring for the influence on coatings.In addition, the SBF immersing experiment of the ceramic coating is used to explore the biological activity.
Keywords: Nickel Titanium alloy Hydroxyapatite Laser cladding bio-ceramic coating
目 次
1 引言 1
1．1 镍钛合金 1
1.1.1 镍钛合金的组成 2
1.1.2 镍钛合金的性能 3
1.1.3 镍钛合金的生物相容性 4
1.1.4 镍钛合金的表面改性 5
1．2 Ti/HA复合材料 6
1.2.1 羟基磷灰石 6
1.2.2 HA /Ti复合材料 7
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