The double sintering method is a process that involves two stages of sintering a powder or green billet to form a dense, strong, and complex part.
5 Key Points to Understand
1. Two-Stage Process
The first stage creates a weak and oversized component.
The second stage expels the binder material and fuses the remaining particles together, resulting in a full-strength part.
2. Widely Used in Metals and Ceramics
This method is widely used in metals and ceramics to produce complex net-shape parts with excellent mechanical properties at a low per-part cost and high repeatability.
3. First Stage: Forming the Shape
In the first stage, a powder or green billet is compressed and formed into the required shape using binders.
This results in a weak and oversized component, as the binders provide only limited strength and cohesion between the particles.
The primary purpose of this stage is to create the desired shape, which can be complex and intricate, without the need for further machining.
4. Second Stage: Sintering
The second stage involves baking the oversized component to remove the binders and cause the remaining particles to fuse together.
This process, known as sintering, takes place at a temperature below the melting point of the material, allowing the particles to bond and coalesce into a dense, strong, and full-strength part.
The sintering temperature, atmosphere, and time are carefully controlled to ensure optimal results.
5. Advantages of the Double Sintering Method
The double sintering method offers several advantages, including reproducible size and hardness, simplified processes, enhanced metal properties, and improved part appearance.
It allows for high levels of purity and uniformity in the starting materials, highly repeatable operations, and the ability to work with difficult materials, such as metals with very high melting points.
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