Gm Global Technolgoy Operations, Inc.

Basant L Tiwari

Seymour Katz

Bob Ross Powell

Aihua A Luo

Vadim Rezhets

Norman E Howard

Blake J Howie

A family of die castable, creep-resistant magnesium alloys has been developed for high-temperature structural applications such as automotive engines and transmission cases. These alloys contain between 3% and 6% aluminum, 1.7% and 3.3% calcium, and up to 0.2% strontium. They have demonstrated 25% greater tensile and compressive creep resistance than AE42, a commercial aluminum, rare earth containing magnesium alloy, and corrosion resistance as good as AZ91D. These alloys are estimated to cost less than AZ91D and have good castability in metal molds as used in permanent mold casting and die casting.

Creep-resistant magnesium alloy die castings

Method and apparatus for controlling the temperature of a molten salt, electrolytic demagging cell wherein an operating condition of the cell (e.g., current, temperature, etc.) is measured and a cathode immersed in the cell's electrolyte is moved to and fro the aluminum melt in the cell in response to the measured condition to vary the heat input to the cell.

Electrolytic removal of magnesium from molten aluminum

Dealuminizing cast iron by contacting it with free-flowing flux particles having a solid silica core and a molten silica shell wherein said flux comprises silica and about 1% to about 5% calcium fluoride.

Process for dealuminizing molten cast iron

Recontaminating cast iron by contacting it with a molten flux consisting essentially of silicon dioxide and calcium fluoride.

Probe for the electrochemical determination of the hydrogen content of molten aluminum comprising: a catalytic metal membrane hydrogen electrode; a Ca-CaH.sub.2 counterelectrode; a solid-state electrolyte such as calcium hydride, calcium hydrochloride and strontium hydrochloride; a porous barrier separating the aluminum from the hydrogen electrode; and a hydrogen accumulation chamber adjacent the catalytic membrane.

Hydrogen probe

An electrochemical concentration cell adapted for immersion in a melt of aluminum-magnesium alloy for determining the concentration of the Mg on an ongoing basis (e.g., during demagging). The cell includes a first probe comprising a housing having a cavity therein containing a Mg-ion-rich molten salt electrolyte. An opening in the housing exposes the electrolyte to the melt via a porous ceramic frit wetted by the electrolyte. A hollow capsule containing a Mg-rich reference material is immersed in the electrolyte and the reference material electrically coupled to the melt via second probe immersed therein. Containment of the reference material within the capsule beneath the melt prevents attack of the housing by the reference material and evaporative loss thereof.

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Sterling Heights, MI, United States of America

Basant L Tiwari