Ultraviolet-laser-assisted precision cutting of yttria-stabilized tetragonal zirconia polycrystal

作者：Kizaki Toru^*; Ogasahara Toshihiro; Sugita Naohiko; Mitsuishi Mamoru

来源：Journal of Materials Processing Technology, 2014, 214(2): 267-275.

DOI：10.1016/j.jmatprotec.2013.09.015

• UV laser-assisted precision cutting
• UV laser
• Yttria-stabilized tetragonal zirconia polycrystal
• Biomaterial
• Difficult-to-cut material

Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) is a promising biomaterial for use in dental and femoral implants. The current method for machining Y-TZP involves grinding after sintering. However, the grinding process is time consuming and therefore costly. To resolve these issues, this paper proposes a precision cutting process that utilizes a UV-laser-assisted machining method that requires no expensive cutting tools such as diamond tools. The UV laser is used to heat the Y-TZP, which improves its machinability. First, we performed experiments to determine that the most suitable machining temperature was 600 degrees C. A simulation was then used to determine the optimal distance between the tool edge and the laser spot. Finally, experiments using a UV laser were conducted to confirm the effectiveness of using a UV laser for machining. In these experiments, a Y-TZP sample was cut, and grooves were generated. The carved grooves were 20 mm long, 100 mu m wide, and approximately 10 mu m deep. Cutting without using a UV laser was also performed as a reference experiment. The results show that the use of the laser significantly decreased the number of large cracks from 14 to 3, the specific cutting energy by 35%, and the breakage of the tool edge. These results demonstrate the possibility of enhancing the productivity of Y-TZP products.

• 出版日期2014-2