CERAMIC MATERIALS & PROCESSES
Low-pressure injection moulding: feedstock to fired component
An introduction to low-pressure injection moulding and its four main stages: feedstock preparation, injection, debinding and sintering.
A public-source technical guide. Illustrative data are not guaranteed specifications for Robat products.
A process, not a ceramic composition
LPIM injects a flowable powder–binder feedstock into a mould, followed by organic removal and sintering. The mould defines the green geometry; subsequent processing establishes the final dimensions and microstructure. Powder, binder, equipment and geometry must be specified separately.
Four main process stages
- Feedstock preparation: Powder and organic ingredients are mixed uniformly; particle distribution and entrapped air require control.
- Injection and binder solidification: The feedstock fills the mould and is demoulded after sufficient green strength develops.
- Debinding: Organics are removed using a method compatible with the binder system; distortion and cracking are key risks.
- Sintering and finishing: Densification, microstructural changes and shrinkage occur; final dimensions and properties are then checked.
This is a conceptual sequence. Combining stages in a furnace does not remove the need to control each stage.