JPS5893834A - Manufacture of inorganic fiber reinforced metallic composite material - Google Patents

Abstract

PURPOSE:To manufacture an inorg. fiber reinforced metallic composite material with high mechanical strength by forming Al films having a specified thickness on inorg. fibers, arranging the fibers and a powdered or foil-shaped metal to be combined in a mold, and heating and molding them under pressure. CONSTITUTION:A films having 0.5-10mum thickness are formed on the surface of inorg. fibers. The preferred inorg. fibers are carbon fibers, boron fibers, alumina fibers or silicon carbide fibers having about 5-140mum diameter. The fibers and a powdered or foil-shaped metal to be combined are arranged in a mold, heated and press-molded under pressure. Ti, Ni or an alloy thereof is effectively used as the metal to be combined. The thickness of the foil-shaped metal is about 50-100mum, the particle size of the powdered metal is <= about 40mum, and the molding is carried out at about 800-1,000 deg.C under about 100-1,000kg/cm<2> pressure in about 0.5-6hr to obtain a composite material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inorganic single fiber reinforced gold@composite material.

In recent years, materials with excellent heat resistance and high mechanical strength such as compressive strength and tensile strength have become desired as materials for turbine blade aircraft parts and the like.

As this type of material, an inorganic fiber reinforced composite material has been proposed in which a metal such as titanium or nickel is reinforced with inorganic fibers such as carbon fiber, poron fiber, alumina fiber, or silicon carbide fiber.

Conventionally, this inorganic fiber-reinforced composite material has been obtained by arranging metal powders such as titanium, nickel, etc. together with inorganic fibers in a mold and heating them. However, in the inorganic fiber-reinforced metal composite material obtained by this method, for example, if silicon carbide or oxide is used as the inorganic fiber and nickel is used as the metal, the nickel is converted into nickel carbide and nickel silicon during the sintering process. Therefore, the strength of the resulting product decreases and it becomes brittle.

Furthermore, when carbon fiber is used as the inorganic fiber and titanium is used as the metal, the titanium in the resulting product is carbonized, so the resulting product has the disadvantage of low strength and brittleness, similar to the above-mentioned composite materials.

In addition, even in the case of composites of boron fibers and alumina fibers, reactions occur at the interface between the fibers and the metal, resulting in insufficient composites.

The present inventors conducted research to provide a method for manufacturing an inorganic fiber-reinforced metal composite material that eliminates such drawbacks, and as a result, they found that an aluminum layer of a limited thickness is interposed between the inorganic fibers and the metal. If the composite metal is combined with the inorganic fibers, the time for the metal to react with the inorganic fibers is drastically reduced, and the resulting inorganic fiber-gold composite material is highly reinforced without producing any carbides or silicides. This knowledge led to the completion of the present invention.

The gist of the present invention is to form an aluminum film with a thickness of 0.5 to 10μ on the surface of inorganic fibers, arrange the inorganic fibers and composite metal in the form of powder or foil in a mold, and then heat under pressure. It is molded to produce an inorganic fiber-reinforced metal composite material.

Carbon fibers, alumina fibers, and silicon carbide fibers each having a diameter of about 5 to 140 μm are preferably used.

Titanium, nickel, and alloys based on these are effective as composite metals.

A film of aluminum can be formed on an inorganic fiber by an ion-blating method (vapor deposition method), an impregnation method, or a dipping method. .

The impregnation method is a method in which inorganic fibers are immersed in molten aluminum and pressurized. In this case, the humidity of the molten metal is 700 to 750.
℃, the pressure is 50~lOOkjl-/cm''.When a thin film of low melting point metal is formed on the surface of the inorganic fiber under the pressure in the middle range of the molten metal, the temperature of the molten metal is 1.
Perform at torr or less.

The thickness of the aluminum film is preferably 0.5 to 10 μm. Aluminum and fibers do not form carbide to the extent that a film is formed within this range. The thickness is adjusted by the temperature of the molten metal or, in the case of a vapor deposition method, the amount of vapor deposition. If the thickness is less than 0°5μ, the metal, inorganic material, and fibers will react with each other, which is undesirable, and if the thickness is more than lθμ, the amount of low melting point metal will increase, which will reduce the adhesive effect of the composite metals, which is not preferred.

The composite metal is used in the form of foil (thickness: 50-100μ) or powder (particle size: 40μ or less), and the molding conditions are: heating temperature: 800-1000℃, pressure: 100-10℃.
00kp/c1n', and the time is preferably 0,5'-a hours.

According to the present invention, the fibers and the metal to be composited do not react to form carbides or silicides of the metal, and the aluminum film on the surface of the fiber and the metal to be composited are bonded between the metals during the composite. Compound (TiXAj'(1-x)
, N1YAl(1-Y), etc.), resulting in a strong bond between the fiber and metal.

The resulting inorganic fiber-reinforced metal composite material has high mechanical strength.

Next, the practical aspects of the present invention will be explained with reference to examples, but the present invention is not limited to these.

Example 1) A bundle of silicon carbide fibers (trade name: Nicalon, manufactured by Nippon Carbon Co., Ltd.) with a single fiber diameter of 10 μm (50
A silicon carbide fiber bundle was obtained by immersing a bundle of 0 fibers in aluminum melted at 720C in an autoclave and applying a pressure of 70kyΔ1 to form an aluminum film with an average thickness of 8μ on the surface of the single fibers.

This is placed on titanium foil (thickness 50μ) with a fiber volume percentage of approximately 30%.
10 layers were stacked and filled into a mold, heated at 850℃ and 800kP/cr.
n'', molded for 1 hour.

Table 1 shows the properties of the composite material obtained.

Example 2) The fibers were drawn on the same aluminum plate (50 μm) as used in Example 1 so that the fiber volume percentage was about 30%, and the fibers were laid out in a row, and then 10 layers were laminated and filled into a mold.
℃, 800ky/cm'', molding for 1 hour.

Table 1 shows the properties of the composite material obtained.

Comparative Examples 1 to 2) The silicon carbide fiber bundles used in Example 1 that did not form any aluminum film, and the silicon carbide fiber bundles used in Example 1 that formed an aluminum film with an average thickness of 12μ in the autoclave were each coated with titanium foil. (Thickness: 50 μm) The fibers were arranged so that the fiber volume fraction was 80%, and then laminated and molded by the method of Example 1. The results are shown in Table 1.

Comparative Examples 3-4) Comparative Example 1. ~・The same silicon carbide fiber bundles used in Example 2 were arranged on a nickel foil (thickness 50μ) so that the fiber volume fraction was 805%, and the results were laminated and molded in the same manner as in Example 2. Shown in Table 1.

Table 1 Examples 8-8) Various thicknesses of aluminum coatings were applied to each of the fibers shown in Table 2 under the conditions shown in Table 2.

These fibers are mixed with T1 powder (40μ or less) and N1 powder (40μ or less).
0μ or less) to obtain a composite material having the properties shown in Table 2.

Examples 9 to 10) Silicon carbide fiber bundles on which the same aluminum film as used in Example 1 was formed were made into Ti-6kl-4V f
Arrange them so that the fiber volume fraction is 85% on Ni-Y alloy foil (thickness 100μ) and Ni-0r alloy (Noonel x -550) foil (thickness 100μ). °C, 1000kg/cm*
, and molded for 1 hour to obtain a titanium alloy composite material and a nickel alloy composite material.

Its tensile strength is titanium alloy composite material 150k)/wI1
11 nickel alloy composite material 155k)/W''.

Patent applicant: Nippon Carbon Co., Ltd. Representative Patent Attorney Tsukasa Ibino

Claims (1)

[Claims] (11) Inorganic fibers with an aluminum film of 0.5 to 10 μm in thickness formed on their surfaces and composite interstices in the form of powder or foil are arranged in a mold, and then heated and molded under pressure. A method for manufacturing an inorganic fiber-reinforced metal composite material, characterized in that (2. In claim 1, one inorganic fiber is one carbon
Method for producing an inorganic fiber-reinforced metal composite material that is fiber, poron fiber, alumina fiber, or silicon carbide fiber〇(3) In claim 1 or 2, the composite gold is titanium, nickel, or A method for manufacturing an inorganic fiber-reinforced metal composite material, which is an alloy mainly composed of.