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What are the properties of nitinol metallic powder?
Nitinol Metal Powder
(Niti alloy powder) is an alloy with a memory function. Shape memory alloys (SMA, for short) can eliminate their deformation completely at a lower heat and regain it after heating. The alloy with “memory’ effect is the material that retains its original shape.
Many successful applications of nitinol metallic powder have been made in the aerospace industry. Memory alloys can be used for the antenna of an artificial spacecraft. Fold the parabolic satellite antenna into the body of the artificial satellite before it is launched. It is only necessary to heat the satellite after the rocket launches to place it in a specific orbit. The “memory function” of the folded antenna allows it to unfold and restore its parabolic shape.
Shape memory alloys have many applications in aerospace, electronics and machinery, biomedicine, bridge building, automobile industry, and everyday life.
What is the best way to prepare nitinol metallic powder?
The following raw materials are used for the PREP process to produce spherical metal powders of nitinol: NiTi bars.
The steps of preparation for the PREP method for the preparation of spherical Nitinol Metal Powder are: the raw materials must be weighed and measured according to the experimental plan and then poured directly into the cemented carbide tank ball milling for wet grind. The ball milling period is 24 hours. After the ball-milling, the pellets are vacuum dried for 50 min at a temperature of 38deg C. They are then added to the granulation agent as a forming aid. The powdered material is placed in a single-column press to be compressed, then it is placed into an integrated dewaxing and low pressure sintering oven for sintering.
The PREP method, which has excellent mechanical properties, was successfully developed using NiTi bars as raw material. This included batching and ball milling followed by drying, granulation forming, sintering. There are many nitinol metallic powders. They are mainly spherical in shape, and the martensite conversion temperature decreases with the decrease of particle size. Preparation PREP produces spherical powders of nitinol, which are improved in terms of hardness, density and bending strength.
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