Effects of vibro-milling time and sintering temperature on the formation and selected properties of nano-hydroxyapatite ceramics derived from bovine bone

Anirut Raksujarit and Tanagorn Sangtawesin
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Abstract

Hydroxyapatite (HA) bioceramics require nanoscale powders to achieve the mechanical strength necessary for load-bearing implants. The impact of vibro-milling on HA derived from bovine bone remains unclear. This study hypothesized that varying vibro-milling duration and sintering temperature could optimize the nano-HA characteristics and ceramic performance. Natural bovine bone was processed into HA powder through boiling, calcination at 800 °C, and initial ball milling. The resulting HA powder was then vibro-milled for 0, 1, 2, 4, and 8 hours to generate nanopowders and sintered between 1150 °C and 1300 °C. A 2 hours vibro-milling treatment produced uniform nano-HA (<100 nm) with good crystallinity. Sintering temperature had a greater influence than milling time, with 1250 °C treatment yielding the highest densification and a maximum bending strength of ∼112 MPa. These findings demonstrate that a 2 hours vibro-milling step combined with 1250 °C sintering produces HA ceramics suitable for load-bearing applications.

Abstract Image

振磨时间和烧结温度对牛骨纳米羟基磷灰石陶瓷形成和性能的影响
羟基磷灰石(HA)生物陶瓷需要纳米级粉末来达到承重植入物所需的机械强度。振动铣削对源自牛骨的透明质酸的影响尚不清楚。本研究假设不同的振磨时间和烧结温度可以优化纳米ha的特性和陶瓷性能。将天然牛骨经煮沸、800℃煅烧、初始球磨加工成HA粉。然后将得到的HA粉末振动研磨0、1、2、4和8小时以生成纳米粉末,并在1150°C和1300°C之间烧结。经过2小时的振动铣削处理,得到了均匀的纳米透明质酸(<100 nm),结晶度好。烧结温度比铣削时间的影响更大,1250°C处理产生最高的致密化,最大弯曲强度为~ 112 MPa。这些发现表明,2小时的振动铣削步骤结合1250°C的烧结,可以生产出适合承重应用的HA陶瓷。
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