Cobalt chromium molybdenum joint casting Material: CoCrMo Application: for artificial joint processing process: vacuum precision casting heat treatment: solid solution, aging heat treatment
Compared with stainless steel (316L), cobalt chromium molybdenum alloy (CoCrMo) artificial joints made of cobalt chromium molybdenum alloy (CoCrMo) have better biocompatibility, wear resistance, corrosion resistance, strength and toughness, so they can be used for a longer time.
It is reported that stainless steel is the earliest metal implant material for human body, and it has excellent processing performance and appropriate compressive strength. However, it is clinically shown that after 316 stainless steel is implanted into human body, crevice corrosion or friction corrosion, fatigue corrosion cracking and other problems will sometimes occur in the physiological environment, and Ni2+, Cr3+and Cr5+will be released due to friction and wear, which will cause prosthesis loosening or malignant tumors, and ultimately lead to implant failure. Therefore, the clinical use of stainless steel has been restricted in Europe, America and other countries.
CoCrMo alloy has become a research hotspot in the field of modern medicine due to its high comprehensive mechanical properties. However, it is not suitable for machining and usually adopts the precision casting processing method. The American Society for Testing and Materials recommended four cobalt based alloys that can be used in surgical implants: forged Co Cr Mo alloy, forged Co Cr W-Ni alloy, forged Co Ni Cr Mo alloy, and forged Co Ni Cr Mo W-Fe alloy. Among them, forged Co Cr Mo alloy and forged Co Ni Cr Mo alloy have been widely used in the manufacture of implants.
The precision casting process can effectively control the grain size, material purity, metallurgical casting defects, etc. of the cobalt chromium molybdenum alloy castings, thus making the mechanical properties and biocompatibility of the products more superior to meet the needs of users and patients.
Extended data: Artificial joint, also known as surgical implant bone joint prosthesis, is a biomaterial product mainly used to treat deformity, pain or loss of function. It must have the following characteristics: non-toxic, non carcinogenic, non repellent, good mechanical properties and process shaping performance.
