CASTING METHOD FOR ALUMINUM OR ALUMINUM ALLOYS AND A MOLD THEREFOR

• US 3,848,847 A
• Filed: 07/02/1973
• Issued: 11/19/1974
• Est. Priority Date: 07/11/1972
• Status: Expired due to Term

• Current Assignee: Masayoshi Mizutani, Noboru Komatsu, Tohru Arai
• Original Assignee: Masayoshi Mizutani, Noboru Komatsu, Tohru Arai
• Inventors: Komatsu, Noboru, Arai, Tohru, Mizutani, Masayoshi
• Primary Examiner(s): Juhasz, Andrew R.
• Assistant Examiner(s): Roethel, John E.
• Application Number:
  US05/375,390
• Time in Patent Office: 505 Days
• Field of Search: 164/57,58,72,138 249/115 117/5.3
• US Class Current: 249/115
• CPC Class Codes: B22C 3/00 Selection of compositions for coating the surfaces of moulds, cores, or patterns
• CPC Class Codes: B22D 21/007 with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

A method of casting aluminum or aluminum alloys characterized by utilizing a mold of ferrous or ferrous alloy members having at least a portion of the mold surface provided with a carbide layer of at least one metal selected from the Group V, Subgroup a of the periodic table. In particular, the metal carbide layer can be a vanadium carbide, a niobium carbide, or a tantalum carbide, which layer is preferably a diffusion layer on the ferrous alloy mold member having a thickness in the range of 2 to 100 microns.

Claims

1. IN A MOLD FOR CASTING ALUMINUM OR ALUMINUM ALLOYS CMPRISING AT LEAST TWO MOLD MEMBERS HAVING MOLD SURFACES COACTING TO FORM A CAVITY FOR RECEIVING THE MOLTEN ALUMINUM OR ALUMINUM ALLOY, EACH OF SAID MOLD MEMBERS BEING OF A FERROUS METAL, THE IMPROVEMENT COMPRISING AT LEAST A PORTION OF THE MOLD SURFACE OF AT LEAST ONE MOLD MEMBER BEING A METAL CARBIDE LAYER OF AT LEAST ONE METAL BEING SELECTED FROM GROUP V, SUBGROUP A OF THE PERIODIC TABLE

2. In a mold according to claim 1, wherein the metal carbide is vanadium carbide.

3. In a mold according to claim 1, wherein the metal carbide is a niobium carbide.

4. In a mold according to claim 1, wherein the metal carbide is tantalum carbide.

5. In a mold according to claim 1, wherein said metal carbide layer is a diffusion layer.

6. In a mold according to claim 1, wherein said mold members include at least one core pin having a surface layer of said metal carbide.

7. In a mold according to claim 1, wherein the entire surface of the mold members are provided with said metal carbide layer.

8. In a mold according to claim 1, wherein said metal carbide layer has a thickness in the range of 2 to 100 microns.

9. In a method of casting molten aluminum or aluminum alloys comprising providing a casting mold formed of at least two mold members of a ferrous alloy having surfaces coacting to form a mold cavity, pouring the molten aluminum or aluminum alloys into the mold cavity, and allowing the molten metal to solidify, the improvement comprising using a casting mold having a portion of the surface of the mold members forming the mold cavity provided with a metal carbide layer of at least one metal selected from Group V, Subgroup a of the periodic table.