Method for preparing cobalt base alloy artificial joint taper-shank

Abstract

The preparation process of cobalt base alloy artificial joint taper shank includes the main technological steps of: making mold; wax pressing-in and combination; making corundum casing adhered and reinforced with silica gel, casting at 1400-1600 and maintaining for 5-30 min via directional solidification in 5-10 mm / min drawing rate, cleaning and post-treatment. In the wax pressing-in and combination step, directional guiding section is designed to form a cone and the wax molds are so combined as to ensure the lengthwise of the formed joint taper shank perpendicular to the isothermal cross section in directional solidification. The technological process of present invention has high product quality and raised performance indexes of the product.

Description

technical field [0001] The invention is a process method for preparing a high-performance cobalt-based alloy artificial joint taper shank by using directional solidification technology, which involves the improvement of the existing process method and ensures the qualified rate of processed products. Background technique [0002] The discussion of the prior art is divided into the following three aspects: [0003] 1. Materials and performance requirements of artificial joint products [0004] The human body is physically disabled under external injury conditions, and limb replantation is the main way for human beings to overcome nature. Artificial metal implants made of stainless steel, cobalt chromium molybdenum, titanium alloy and other alloy materials with high corrosion resistance, high strength and good biocompatibility are implanted into the human body, such as joints, which have been proved by long-term practice to be very important biomedical artificial implant devi...

AI Technical Summary

Problems solved by technology

[0012] 3. The technical reasons for the unqualified sampling performance of ordinary precision casting cobalt chromium molybdenum implants

But in fact, due to changes in the interface of key products, tiny pearls on the surface that need to be combined with the human body, or changes in the large-sized heterogeneous interface, this makes the local alloy solidification lag behind the solidification of the entire joint under the condition of considering the alloy filling, and the solidification cannot be carried out smoothly. , resulting in unsatisfactory feeding sequence, resulting in shrinkage and porosity on local joints, some shrinkage porosity was found in X-ray inspection, and some were not found, so that the mechanical properties of joint products were lower than the standard requirements

On the other hand, due to the increase of pouring temperature in order to ensure filling, the grain size of the alloy is coarse, and the distribution of carbides in the strengthening phase is concentrated and coarse, resulting in increased brittleness of the alloy and difficulty in meeting the plasticity index.