Amorphous carbon as a bio-mechanical coating — mechanical properties and biological applications
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- 作者：Tiainen ; Veli-Matti
- 关键词：Pulsed arc-discharge method ; Tetrahedral amorphous carbon ; Bio-medical applications ; Hip prostheses
- 刊名：Diamond and Related Materials
- 出版年：2001
- 出版时间：February, 2001
- 年：2001
- 卷：10
- 期：2
- 页码：153-160
- 全文大小：184 K
文摘
For improving the bio-mechanical properties of articulated and solid implants diamond-like carbon (DLC) is a very promising coating material because it is chemically inert, extremely hard, wear resistant and biocompatible. These possibilities are reviewed. The high quality (sp3-fraction 
80 % ) hydrogen-free DLC coatings tested were deposited (5 μm/h per 20 cm2) with a filtered pulsed arc discharge method. Adhesion problems were solved with proper plasma energy control and suitable intermediate layers. With a hip simulator, loads up to 1300 kg on DLC-coated (50–200 μm) joints were used without failure. Under a 200-kg load the coefficient of friction was 0.05, 0.05 and 0.14 for DLC-coated, metal–polyethylene and metal–metal pairs, respectively. Diverse tribological tests show that the wear in DLC-coated metal joints is 105–106 times lower than in conventional metal–polyethylene and metal–metal pairs. The wear of the plastic acetabular cup is reduced at least 10 times if the metal ball of the joint is coated with DLC. On a commonly used CoCrMo alloy 1 μm DLC decreased the corrosion rate of the substrate by a factor of 105 when exposed to a saline solution equivalent to the body fluid in 37°C for 2 years. Preliminary animal tests indicate benign biological response.
80 % ) hydrogen-free DLC coatings tested were deposited (5 μm/h per 20 cm2) with a filtered pulsed arc discharge method. Adhesion problems were solved with proper plasma energy control and suitable intermediate layers. With a hip simulator, loads up to 1300 kg on DLC-coated (50–200 μm) joints were used without failure. Under a 200-kg load the coefficient of friction was 0.05, 0.05 and 0.14 for DLC-coated, metal–polyethylene and metal–metal pairs, respectively. Diverse tribological tests show that the wear in DLC-coated metal joints is 105–106 times lower than in conventional metal–polyethylene and metal–metal pairs. The wear of the plastic acetabular cup is reduced at least 10 times if the metal ball of the joint is coated with DLC. On a commonly used CoCrMo alloy 1 μm DLC decreased the corrosion rate of the substrate by a factor of 105 when exposed to a saline solution equivalent to the body fluid in 37°C for 2 years. Preliminary animal tests indicate benign biological response.