Process for making a composite liner for cold chamber die casting application
OwnerQingyou Haninventor
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Abstract
A process of forming a low cost, erosion, oxidation, and wear resistant composite liner or insert that can be installed into a shot chamber in a die casting machine is provided. The process utilizes a self-healing erosive wear resistant coating on a liner of refractory metal to serve as the working surfaces of a shot chamber. The refractory liner is bonded to a low cost material so that the liner can be made extremely thin. Such a composite liner is expected to have an improved service life for die casting of corrosive metals and alloys.
Claims4
A method for forming an oxidation, erosion, and wear resistant composite liner that can be installed into a shot chamber in a die casting machine for forming aluminum castings, the method comprising the steps of:
- preparing a liner made of a refractory metallic material with melting temperature higher than 1600° C. wherein the liner consists of an internal surface for contacting a molten aluminum and an outside surface for contacting the shot chamber;
- coating the internal surface of the liner with a thin layer of protective coating for avoiding the refractory metallic material from oxidation loss during aluminum die casting, and
- wherein said liner and the protective coating are bonded metallurgically to form a one-piece composite liner that, when damaged, can be removed from the shot chamber and replaced with a new composite liner for protecting the shot chamber wherein the protective coating is an aluminizing coating, and wherein a metallurgical bond forms between the refractory metal liner and aluminides.
Dependencies are inferred from the claim text.