초록 ▼

A metal matrix composite was fabricated by adding particles of calcium hexaboride to a metal of aluminum, magnesium or titanium and their alloys. The resulting metal matrix composite is light weight has improved strength, increased elastic modulus and reduced thermal coefficient of expansion, thus m

A metal matrix composite was fabricated by adding particles of calcium hexaboride to a metal of aluminum, magnesium or titanium and their alloys. The resulting metal matrix composite is light weight has improved strength, increased elastic modulus and reduced thermal coefficient of expansion, thus making the metal matrix composite more useful in industry. A metal matrix composite is also formed by mixing particles of aluminum, magnesium, titanium or combinations thereof with particles of silicon lexaboride, calcium hexaboride, silicon tetraboride, calcium tetraboride or combinations thereof. The blended particles are processed according to powder metallurgical techniques to produce a metal matrix composite material.

대표청구항 ▼

I claim: 1. A metal matrix composite comprising a magnesium matrix and particles of calcium hexaboride, said particles of calcium hexaboride being present in a range of about 0.1 to about 80 wt. % in the metal. 2. A metal matrix composite in accordance with claim 1 wherein said calcium hexabori

I claim: 1. A metal matrix composite comprising a magnesium matrix and particles of calcium hexaboride, said particles of calcium hexaboride being present in a range of about 0.1 to about 80 wt. % in the metal. 2. A metal matrix composite in accordance with claim 1 wherein said calcium hexaboride has an average particle size of about 0.1 to about 200 microns. 3. A metal matrix composite comprising a metal selected from the group consisting of aluminum, magnesium, titanium and mixtures thereof, and particles of calcium hexaboride and particles of silicon hexaboride, said particles of calcium hexaboride and said particles of silicon hexaboride being present in a range of about 0.1 to about 80 wt. % in the metal. 4. A metal matrix composite in accordance with claim 3 wherein said particles of calcium hexaboride and said particles of silicon hexaboride have an average particle size of about 0.1 to about 200 microns. 5. A metal matrix composite in accordance with claim 3 wherein said metal is aluminum. 6. An article of manufacture comprising a metal matrix composite, said metal matrix composite comprises a magnesium matrix and particles of calcium hexaboride, said particles of calcium hexaboride being present in a range of about 0.1 to about 80 wt. % in the metal. 7. An article of manufacture in accordance with claim 6 wherein said calcium hexaboride has an average particle size of about 0.1 to about 200 microns. 8. A horseshoe made of a metal matrix composite and having an elastic modulus in the range of 70-180 GPa., said horseshoe comprising a metal matrix composite having a magnesium matrix and particles of calcium hexaboride, said particles of calcium hexaboride being present in a range of about 0.1 to about 80 wt. % in the metal. 9. The horseshoe of claim 8 wherein said metal matrix composite contains from about 5 to about 10 wt % calcium hexaboride particles having an average particle size of about 75 microns. 10. A memory disk substrate made of a metal matrix composite and having an elastic modulus in the range of 70-180 GPa., said memory disk comprising a metal matrix composite having a magnesium matrix and particles of calcium hexaboride, said particles of calcium hexaboride being present in a range of about 0.1 to about 80 wt. % in the metal. 11. The memory disk of claim 10 wherein said memory disk substrate is made from a metal matrix composite that contains calcium hexaboride particles having an average particle size of about 10 microns and the remainder being metal. 12. An actuator arm for a hard drive, said actuator arm being made of a metal matrix composite and having an elastic modulus in the range of 70-180 GPa., said actuator arm comprising a metal matrix composite having a magnesium matrix and particles of calcium hexaboride, said particles of calcium hexaboride being present in a range of about 0. 1 to about 80 wt. % in the metal. 13. An actuator arm in accordance with claim 12 wherein said metal matrix composite contains about 30 wt % calcium hexaboride particles having an average particle size of about 50 microns.