From the course: Additive Manufacturing: Metal 3D Printing

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Green and brown process stages

Green and brown process stages

From the course: Additive Manufacturing: Metal 3D Printing

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Green and brown process stages

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- [Instructor] The printing process has a few steps, which will vary somewhat for different formulations. First, a part is 3D-printed. The printed part, which is a mix of metal and plastic, is called a green part. Next, it needs to have the plastic removed somehow in a process called debinding. Depending on the binders used, this might be a chemical process, but may only require carefully heating the part. Debinding leaves you with a fragile porous part in what's known as a brown state. The brown part has most the binder removed, but just enough left to retain the part shape. Print materials may contain more than one binder: one designed to be removed during debinding, the smaller quantities of the second binder called a backbone binder intended to hold the brown part together. Finally, the part will be sintered, which means it'll shrink to replace the open voids typically between 10 and 20% in each dimension. Due to…

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