In Reply to: Hard to find Specialty Metals... posted by Bobby Hairston on 06/27/00 at 7:48 AM:
I am looking for someone who can make the following metal for me. It must be manufactured exactly as described. It is an experimental metal. If you can't help do you know someone who can?
The contents are as follows: Aluminum, Magnesium, Zinc, Manganese,
Copper, Red Brass Cast (Copper, Zinc, Iron, Antimony, Nickel, Tin,
Lead, Phosphorus, Sulfur) Chromium, Titanium Dioxide
Blending the Metal (Note: These condensed instructions are designed for people
experienced in metallurgy).
Induction heating units are needed inside a common vacuum chamber.
First, melt 3.85 pounds (10.8%) Magnesium at 648.8..C. Next, cool to 419.58 0C. at which
point 4.28 pounds (12.0%) of Zinc is added as chunks into the Magnesium. (NOTE: all
blending of elements require mixing.) The temperature should not fall below 419.58 0C The
Zinc, considered the dispensable element is not dispensable in the sense of doing without
Next, heated in another crucible is 10.59 pounds of aluminum (29.7%) melted at
660.37 0C. This aluminum is then (over a period of several minutes) poured into the
Magnesium/Zinc mixture using continuous mixing. The proper vacuum system will allow
this mixture to next be up-heated to 1000 0C. in readiness for the next blending process.
(Without the proper vacuum, the Magnesium will react in a negative manner.)
Within the same vacuum system, melt 3.17 pounds of Manganese (8 9%). This Manganese is then cooled to the temperature of molten copper, needed to then add 5.24
pounds (14.7%) of copper powder. This adding of the copper should be slow with the
needed heating, so as not to drop the temperature.
The temperature of these two elements is then adjusted to have 4.85 pounds
(13.6%) of Red Brass Cast added. This Red Brass Cast must be made of Copper - 84.15%,
Tin - 4.40%, Lead - 5.42%, Zinc - 5.13%, Iron - 0.17%, Antimony - 0.12%, Nickel - 0.58%,
Phosphorus - 0.007%, Sulfur - 0.019%. After this blending is completed, this
Manganese/Copper/Red Brass Cast mixture is slowly poured into the
Aluminum/Magnesium/Zinc mixture, which should be at 1,000 0C.
The heat on this blend will next be raised up to 2,000 0C. in readiness for the next
process requirement. Next 2.25 pounds (6.3%) of Chromium is melted. The Chromium is
then cooled to 1,660.10 0C. Next added to the Chromium is 1.43 pounds (4.0%) of Titanium
Dioxide. Total Mixture = 35.66 lbs.
VERY IMPORTANT: Before the Titanium Dioxide is added to the Chromium, the
blended elements (all of which are in one crucible) must be up-heated to 2000 0C. The
MOMENT they reach the 2,000-2,100 0C., IT IS THEN that the Titanium Dioxide is added
to the Chromium. The time lapse should be as short as possible between when the Titanium
Dioxide is mixed with the Chromium and these two blended items are added to the other
elements. Thus, after a minute of mixing these two elements, they are quickly poured into the crucible containing all the other elements. Keep in mind, the Chromium/Titanium Dioxide blend will still be at 1,660.10 0C When this mixture is added to the 2,000-2,100 0C. elements, there will be a temperature drop to the total volume, but it MUST NOT go below 2,000 0C.
Thus, heating up the crucible containing the other mixture to 2,100 0C. should be done
before adding the Chromium/Titanium Dioxide blend. The metals, when blended, should be at no less than 2,000 0C. and no more than 2,100 0C.
Finally, all the metals are stirred for one minute and the mixture is quickly poured
into a mold.
SILICON NITRIDE MOLD
A preheated mold of this material should be at 700 0C. and the mold should be filled
AS SOON AS POSSIBLE. The mold is then place in a room set at 22 0F. with air blowing
above and below the mold to cool it quickly. After approximately 4 to 5 hours, it will be
cooled and can be removed.
Edwin (Tom) Mix