Improved Machinability of Cobalt Chromium Molybdenum Alloys

(Improved Machinability of Cobalt Chromium Molybdenum Alloys)

cobalt chromium molybdenum is an excellent choice for many surgical implant applications because of its exceptional strength, toughness and corrosion resistance. However, it is often considered a difficult material to machine because of its high hardness and low thermal conductivity.

It is a popular material for jewelry because it resembles precious metals like platinum or gold. It also has a high white color and shine that gives it a beautiful look, making it appealing to customers.

Despite these properties, it is still considered as a difficult material to work with because of its low machinability and many problems during machining. The machinability of cobalt chromium molybdenum alloys can be improved by minimizing the cutting speed, feed rate and depth of cut along with using a sharp cutting edge tool during machining.

To improve the mechanical properties of wrought or forged cobalt chromium alloys, an activation composition containing at least 25% (v/v) hydrogen peroxide and at least 37% (fuming hydrochloric acid) is recommended for reactivity testing of wrought and forged cobalt chromium metals. The resulting metallurgical activation improves the oxidation behavior, reducing oxygen vacancies, improving mechanical properties and increasing the surface area of the work-piece.

The implantation of low friction ionic liquids containing the anionic amino acid phenylalanine is demonstrated to enhance the corrosion and wear performance of titanium (Ti6Al4V) and cobalt chromium molybdenum (Co28Cr6Mo) alloys. The ionic liquids stabilize coatings and mitigate the effects of chemical induced metal ion release on the surfaces of the alloys.

(Improved Machinability of Cobalt Chromium Molybdenum Alloys)