In the process as claimed by Megy, up to 3000ppm (0.3%) of titanium is added to the molten
aluminum. After the titanium is added, grain refining material which reacts with titanium is added
to the melt in the form of a gas. The treated aluminum is then used to form a cast product. Megy
claim I is representative of the invention as claimed by Megy:
1. An improved method for treating molten aluminum for solidifying into
castproducts wherein the molten aluminum is subjectto ametal treatment for
removing impurities, the improved method comprising forming grain refiner
in the molten aluminum, the method comprising:
(a) providing a molten aluminum body;
(b) providing I to 3000 ppm titanium in said molten aluminum body;
(c) introducing to said molten aluminum body, a material reactive with
said titanium, said material being in gaseous form at molten
aluminum temperature and comprising at least one
component of the group consisting of boron, sulfur, nitrogen
andphosphorus, said material and said titanium forming grain
refining nuclei in the aluminum body; and
(d) solidifying at least a portion of said molten aluminum body into a
grain refined, cast product.
Patent 5,935,295, col. 10, 1. 52 - col. 11, 1. 2. Heshmatpour's process appears to be essentially the
same except that up to 200,000 ppm (20%) titanium is provided. Claim 21 is representative of the
process as claimed by Heshmatpour:
21. An improved process for treating a molten aluminum medium for
solidification into a grain refined, cast product, wherein grain refining nuclei
are formed in the molten aluminum medium, the improvement comprising:
(a) providing the molten aluminum medium;
(b) providing from I to 200,000 ppm of titanium in the molten aluminum
medium;
(c) introducing to the molten aluminum medium, a material that is reactive with
the titanium, the reactive material being in a gaseous form at a
temperature of the molten aluminum medium and comprising at least
one element selected from the group consisting of carbon, boron,
sulfur, nitrogen and phosphorus, the reactive material and the
titanium forming the grain refining nuclei in the molten aluminum
medium; and
(d) solidifying at least a portion of the molten aluminum medium into the grain
refined, cast product.
Application 09/020,616, Paper 7, p. 6.
-3-
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007