JPH06248374A - Production of super-hard aluminum composite material - Google Patents

Abstract

PURPOSE:To simplify the production of aluminum composite material and to produce super-hard aluminum composite material which is obtained by in situ forming and dispersing fine nitride and boride particles in aluminum. CONSTITUTION:Aluminum or an aluminum alloy is melted on a powdery mixture consisting of powdery boron nitride and powdery metal such as Hf, Zr, Tl or Ta under an argon or nitrogen atmosphere to impregnate the molten metal into the powdery mixture. At this time, the boron nitride is decomposed to react with Al, or Hf, Zr, Tl or Ta and the boride and nitride particles are in-situ formed and dispersed. Thus the production process of the aluminum composite material is simplified and the aluminum composite material which contains fine boride and AlN paticles and therefore has an extremely high hardness of 650 Vickers hardness Hv on the average, can be produced.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY According to the present invention, a particle dispersion strengthened aluminum composite material can be easily manufactured. In addition, since two or more kinds of fine particles are generated and dispersed in situ in aluminum, it becomes an unprecedentedly high hardness aluminum material and has a high specific hardness, so it can be applied to structural parts materials of many equipment including transportation equipment. it can.

[0002]

2. Description of the Related Art Heretofore, as a method for producing a particle dispersion-strengthened aluminum composite material, a powder metallurgy method of mixing, molding, and sintering aluminum powder and ceramic powder, or mixing particles in high-viscosity semisolid aluminum. Although the component casting method can be seen, all of them are methods of forcibly dispersing ceramic powder having poor wettability in the metal, and high cost is unavoidable. Further, in the case of the Fortex method or the molten metal stirring method, it is unavoidable to add an alloy for improving the wettability, and it is difficult to disperse the fine particles necessary for exhibiting high strength.

[0003]

According to the present invention, the following 2
I am trying to resolve the point. Since it is indispensable to improve the material properties to uniformly disperse the fine particles, the fine particles are uniformly dispersed to improve the mechanical properties. Simplify the manufacturing process.

[0004]

To solve the above problems, the following means are used. First, in order to uniformly disperse fine particles, a metal having a large negative free energy of standard boride formation, Hf, Z
A powder of r, Ti, Ta or Nb and a powder of boron nitride are mixed and loaded into a crucible. Next, aluminum or an aluminum alloy is placed on top of this and heated and melted in an argon or nitrogen atmosphere. Molten aluminum or aluminum alloy is impregnated in the mixed powder, and at this time, boron nitride decomposes and reacts with Al or Hf, Zr, Ti, Ta or Nb in the mixed powder to form boride and nitride particles. Generate in situ. Since these particles are generated in situ, they are likely to become fine, and since the decomposition position of boron nitride is evenly distributed, the particles generated in situ are uniformly dispersed, which leads to improvement in mechanical properties of the composite material. In the present invention, on a mixed powder consisting of metal powder and boron nitride, simply heat aluminum or aluminum alloy in the same crucible in an argon or nitrogen atmosphere.
It only dissolves and holds it, simplifying the manufacturing process.

[0005]

Next, the method of carrying out the present invention and the product thereof will be described with reference to experimental results.

Tamman tube made of magnesia (inner diameter 17 mm,
(Height 100 mm) is charged with a mixed powder of 4.25 g of boron nitride powder and 4.25 g of titanium powder, 5.082 g of pure aluminum ingot is placed thereon, and heated in a nitrogen atmosphere for 1 hour at a temperature of 1473K. Held As a result of performing X-ray diffraction on the obtained composite material, it was possible to confirm the production of TiB ₂ and AlN as shown in FIG. 1. Further, the organization at this time is as shown in FIG.
Fine white TiB ₂ particles and gray AlN particles are dispersed in aluminum. Further, the Vickers hardness H _V of the material was measured at a load of 500 gf, and the average H _V =
A hardness of 650 was obtained and a super hard aluminum composite material could be produced.

[0007]

The composite material manufacturing method according to the present invention is simple. Further, the hardness of the obtained material is extremely high, and it is excellent as a material that is lightweight and has high hardness. Therefore, it is considered to be applied to many equipment parts including transportation equipment parts, and to exert a great effect on energy saving measures.

[0008]

[Brief description of drawings]

FIG. 1 X in cross section of manufactured cemented carbide composite material
Line diffraction results are shown for aluminum (□ in the figure), TiB
The peaks of ₂ (○ in the figure) and AlN (Δ in the figure) are clearly seen.

FIG. 2 shows the structure of the manufactured composite material. The structure shows a structure in which fine white TiB ₂ particles and gray AlN particles are dispersed in an aluminum matrix.

Claims (3)

[Claims] 1. Under an atmosphere of argon or nitrogen gas,
A method for producing a super hard aluminum composite material in which molten aluminum or aluminum alloy is impregnated in a mixed powder composed of a metal powder and a boron nitride powder, and boride and nitride particles are simultaneously generated and dispersed in situ. 2. The metal powder according to claim 1 is Hf, Zr, Ti,
The method for producing a composite material according to claim 1, wherein any one or more of Ta and Nb is used. 3. The boron nitride according to claim 1 is decomposed by impregnation with molten aluminum or aluminum alloy to form Al
Alternatively, it reacts with any one or more of the metals Hf, Zr, Ti, Ta, and Nb of the second item to form a nitride and a boride in situ. Composite material manufacturing method.