JPH03180435A - Manufacture of y2o3 stabilized zro2 short fiber reinforced al matrix composite - Google Patents

Abstract

PURPOSE:To provide the composite with high strength and high elasticity by mixing Y2O3 stabilized ZrO2 short fibers in a molten metal of an Al base alloy, injecting the above into a die while pressure is applied, executing secondary pressurizing and controlling the reaction rate. CONSTITUTION:Y2O3 stabilized ZrO2 short fibers subjected to interface soln. treatment are previously mixed in a molten metal of an Al base alloy contg., by weight, 0.1 to 6% Mn, 0.2 to 4% Cr, 0.2 to 4% Si, 0 to 2% Ni and 0 to 2% V. They are injected into a die while pressure is applied and are integrally compounded. Furthermore, secondary pressurizing is executed to form acicular intermetallic compounds, which are uniformly dispersed and allowed to coexistent into an Al solid soln. matrix. Moreover, under pressure casting, an Al matrix peritectic alloy is brought into reaction with the intermetallic compounds to execute the compounding of the peritectic matrix alloy intermetallic compounds/the Y2O3 stabilized ZrO2 short fibers. In this way, the composite can be manufactured by a die casting method.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for manufacturing fiber-reinforced metal composite materials (FRM), which is attracting attention as a new field of composite materials. This invention relates to a manufacturing method for producing a base composite material made of ceramic fibers and intermetallic compounds by die-casting.

<Conventional technology and its problems> In general, the point to pay special attention to when using this type of composite technology for fiber-reinforced metal composite materials (FRM) is to combine the metal and composite materials without impairing the properties of the reinforcing fibers mixed in the metal. It is about becoming. However, in general, during the manufacturing process, fiber materials and metals such as molten All-based alloys come into contact at high temperatures, so the fiber materials are likely to deteriorate due to the reaction, making it difficult to obtain the high strength and high elastic modulus predicted by the composite rule. Therefore, there are regulations regarding the manufacturing method.

As a general manufacturing method, reinforcing fibers are preformed and preheated, placed in a preheated mold, and then molten Al base alloy is press-fitted into the mold, solidified and composited while maintaining the pressure. A high-pressure solidification casting method is known in which a fiber-reinforced AfL-based composite material is produced by minimizing the reaction time between the fiber material and the base alloy.

However, in such conventional methods, the deterioration of the fibrous material during the manufacturing process is kept to a minimum by compositing, in other words, the time during which the fibrous material and metal are in contact at high temperature by applying high pressure is limited to several seconds. As a result, it is possible to create composites that minimize reactions at high temperatures, but fiber materials mixed in metal cannot be expected to form an integrated composite with metal, and as a result, the bond between fiber materials and metal In this case, a slipping phenomenon (effect) is likely to occur due to the formation of a minute amorphous layer, and it has been impossible to impart high strength and high elastic modulus to the metal.

In addition, conventional methods do not have the flexibility to mold fiber-reinforced metal composite materials, ie, products, in a wide variety of shapes, unlike the die-casting method.

<Problem to be solved by the invention> The present invention has been made in view of the above-mentioned conventional circumstances, and the technical problem to be solved is to realize an integrated composite of reinforcing fibers and metal, and to achieve high performance. Strength.

Y203-stabilized zrO□ short fiber reinforced ^l-based composite that enables the production of highly elastic fiber-reinforced metal composite materials, further increases its high strength and high elastic modulus, and also enables production by kudzu cast method. The purpose of the present invention is to provide a method for manufacturing the material.

<Means for achieving the technical object> The technical means taken by the present invention to achieve the above object are as follows: 0.1 to 6 vj% Old, 0.2 to 4 W [% Cr
, Al containing 0.2~4W1%Si or further containing O~2vt%Ni and 0~2Wt%■ in each of the above elements
Y2O3 stabilized z+O□ short fibers that have been subjected to interfacial solution treatment are mixed in the base alloy molten metal in advance, and after injecting the base alloy molten metal into the mold under pressure, the mixture is heated to the alloy peritectic point transformation temperature. At the same time, secondary pressure is applied to the molten metal in the mold to control the reaction rate, and by the secondary pressure, Mn and Cr that aggregate at the grain interface are converted into intermetallic compounds of At-Mu and AJL-Cr and are A needle-like intermetallic compound and a needle-like intermetallic compound that grows in the direction of secondary pressure using this nuclear intermetallic compound as a base are generated, uniformly dispersed and coexisting in the A solid solution base, and under the pressure casting. AJ1 base peritectic alloy and intermetallic compound are reacted to form base alloy/Y2 03 stabilized 2rO□
Composite of short fibers, peritectic brittle matrix alloy intermetallic/Y2 Oi stabilizationz 02 Composite of short fibers, intermetallic compounds and Y2O.

・LRO: A synergistic composite using two short fibers is used to obtain a strong composite.

<Example> An example of implementing the present invention will be described below.
O3 stabilization 2rO□ short fiber reinforcement^ (base composite material is 0.1~6wj%Mn, 0.2~4w in weight ratio to kl base)
t%Cr, 0.2-4 vt%Si added or O,
1-6 v1%h, 0.2-4r1%Cr, 0
．． 2-4vt%Si, 0-2W(%Ni and O-2
It is basically a u-Mn-Cr-3l based A female base alloy with W1% V added, Y2 (h stabilized ZrO, composite with short fibers).

When the hL base alloy reaches the P1 temperature range due to the addition of 0.1 to 6 vt% Mn by weight, a peritectic reaction occurs, and when secondary pressure is applied to the peritectic point transformation temperature, MnAfLb
, CrAjh intermetallic compounds are crystallized as primary crystals. This MnAl. , Ct^Q7 intermetallic compounds are generated from nuclear intermetallic compounds and acicular intermetallic compounds, and in particular, acicular intermetallic compounds form nuclear intermetallic compounds, as is clear from the crystal structure diagram shown in Figure 1. It grows in the direction of secondary pressure as a base point. In this case, the average growth length of the acicular intermetallic compound is about 0.301/l to G, 4a+/i.

Then, in this AL-MIl-Cr-3l alloy melt, Y2O subjected to interfacial solution treatment and stabilized ho□ short fibers are mixed in advance and integrated and composited in a mold.

The above Y2O. Stabilized zrO□ short fibers are Y2O.

XrO□ containing a slight amount of 2 to 8%, density 4.83gf
/an', tensile strength 210 kgf/mm', elastic modulus 35100 kgl/w', operating temperature 2650°C with no change in intrinsic physical properties (AJL, O,, Sic, S
i, tensile strength about 1/10 compared to L), AI-M
Stable for u-Cr-3l alloy molten metal, Af at high temperature
It has characteristics such as minimum amount of reaction with L, Mn, Cr, and Si.

Ajt- as a reaction layer with AQ-old-Ct-3i alloy
Interfacial solution treatment was performed by sputter-depositing a thin film of Ct, aooaA, Y2O, stabilization 2tO, and short fibers with 3N+.
Ion implantation was performed at a 00 KeV implantation temperature of 300K, and N of about 7oo
``Create an improvement layer. Y2O by ion implantation.

Stabilization! In addition to significantly improving the adhesion between rO□ short fibers and O□-Cr-based thin films to achieve integration, Ajl-Mn
- A composite alloy is obtained by integrally combining it with a Ct-9i alloy as a liquid phase mixture.

Next, Y2O3 stabilized 2rO□ short fiber reinforced U of this example
The method for manufacturing the base composite material (hereinafter referred to as the present method) will be explained based on the following manufacturing conditions.

0. Molten metal injection temperature near 50-800℃b, mold temperature
=250~500℃C9 Secondary pressure: 50 shoes p
a~250mpt First, this construction method is AJL-Mn-Ct-
The blending ratio of the 3i-based alloy and the y, o, and stabilized XrO
Set to Si-based alloy.

Then, Y2O was added to the molten 41-Mn-Cr-3i alloy.
, stabilized 2r02 short fibers are mixed in advance to form n-Mn
- After injecting the molten Ct-3i alloy into the mold under pressure, secondary pressure is applied to the molten metal in the mold in accordance with the peritectic point transformation temperature of the entire alloy in the mold to reduce the reaction rate (crystallization of intermetallic compounds). control the reaction pressure (1 hour, temperature, etc.). Then, as is clear from the crystal structure diagram in FIG. Y2O3 stabilized zt subjected to solution treatment with base peritectic alloy under pressure casting
02 short fibers react mainly in the nuclear intermetallic compound mixed nearby, and the red base alloy/Y2 0i stabilized 2tO□
Short fiber composite, peritectic red-base alloy intermetallic compound/Y2
(h Stabilized 1to□ forms a crystalline structure that brings about synergistic composite reinforcement with the composite of short fibers.

Therefore, Y2O3 stabilized 2r produced by this method
O□ According to the short fiber reinforced Al-based composite material, An, which exposes the surface of the fiber material as a reaction layer between the fiber material and the bladder-M+-Cr-3i alloy by ion implantation during interfacial solution treatment,
- Y2O3 stabilization by integrating with Cry-based thin film
□ Short fibers are integrated and mixed in the base alloy, so there is no risk of slipping like in the past, and with the excellent properties of fiber materials, the A9 base alloy has high strength and high elasticity. And Y2O3 stabilized XtO2 short fibers and All-Mu
Further superior high strength and high elasticity can be obtained by the synergistic composite effect with the nuclear and acicular intermetallic compounds in the -Ct-8i alloy.

In addition, according to this method, by making the secondary pressurization direction perpendicular to the mold injection direction at a 90° angle, the 721 03 stabilized 2tO is placed in the injection direction and the intermetallic compound is placed in the direction perpendicular to this. It has become possible to change the functionality of composite materials, which until now had only unidirectionality, to orthogonal bidirectionality.

In addition, by combining Y2O, stabilized 2r (h short fibers to the same level as acicular intermetallic compounds, it becomes possible to have a degree of freedom in castability.
A stabilized 2tO□short fiber reinforced^1 composite material can be produced (cast) by a die-casting method.

<Effects of the Invention> Since the present invention has the configuration as described above, it exhibits the following effects.

■ Weight ratio: 0.1-6vt%Mn, 0.2-4
vt%Ct.

Contains 0.2 to 4 wt% Si or further contains 0 to 4 wt% of each of the above elements.
Y2O subjected to interfacial solution treatment, stabilized 2r in AJ base alloy melt containing 2wt% old and O~2WI%■
After pre-mixing O□ short fibers and injecting the An-base alloy molten metal into the mold under pressure, secondary pressure is applied to the molten metal in the mold in accordance with the alloy peritectic transformation temperature to control the reaction rate. A nuclear intermetallic compound and an acicular intermetallic compound that grows in the secondary pressure direction using this nuclear intermetallic compound as a base are generated, and they are uniformly dispersed and coexisted in the solid solution base, and the source of the pressure casting. ■ React base peritectic alloy and intermetallic compound to create AfL base alloy/Y2 03 stabilized 1to□ short fiber composite, peritectic At base alloy intermetallic compound/Y2 03 stabilized zr
A manufacturing method characterized by compositing O2 short fibers, the method comprising the step of compositing O2 short fibers, the method comprising:
The stabilized 2rO□ short fibers react mainly with the nuclear intermetallic compounds mixed nearby, and are evenly mixed together like the acicular intermetallic compounds that crystallize and grow in the direction of secondary pressure, resulting in a synergistic composite effect. It is possible to produce a Y2O, stabilized 2rO□ short fiber reinforced Af-based composite material with a crystalline structure, ie, high strength and high elasticity.

(2) By appropriately adjusting the direction of injection of the composite material and the direction of secondary pressurization, it is possible to position the mixed short fibers and the direction of intermetallic compound formation.

■ By combining the y2O3 stabilized hO□ short fibers to the same level as the acicular intermetallic compound, it becomes possible to have a degree of freedom in castability. A reinforced^l-based composite material could be produced by die-casting, and a manufacturing method with great useful and practical effects could be provided.

Therefore, the intended purpose was achieved.

[Brief explanation of drawings]

The first drawing shows Y2O3 stabilized 2rO□ produced using this method.
FIG. 2 is a crystal structure diagram of a short fiber-reinforced At-based composite material. Patent applicant Akio Nakano

Claims (1)

[Claims] Weight ratio: 0.1 to 6 wt% Ma, 0.2 to 4 wt% Cr
, containing 0.2 to 4 wt% Si, or each of the above elements further contains 0.
Y_2O_3 stabilized ZrO_2 short fibers subjected to interfacial solution treatment are mixed in advance in an Al-based alloy molten metal containing ~2wt%Ni and 0-2wt%V, and the Al-based alloy molten metal is pressurized into a mold. After injection, secondary pressure is applied to the molten metal in the mold according to the alloy peritectic transformation temperature to control the reaction rate, and the reaction rate is controlled to form the nuclear intermetallic compound and the direction of secondary pressure from this nuclear intermetallic compound as a base point. The acicular intermetallic compound that grows is produced and is uniformly dispersed and coexisted in the Al solid solution base, and the Al base peritectic alloy and the intermetallic compound are reacted under pressure casting to form an Al base alloy/Y_2O_3 stable. Composite of ZrO_2 short fibers, peritectic Al-based alloy intermetallic compound/Y_2O
A method for producing a Y_2O_3 stabilized ZrO_2 short fiber-reinforced Al-based composite material, which comprises performing a composite of _3 stabilized ZrO_2 short fibers.