JPS62142702A - Production of metallic shape stock containing different material - Google Patents

Abstract

PURPOSE:To easily produce a molding having uniformity and a desired shape by mixing various powder grains of different metals having different m.p., forming a rough molding from the mixture composed thereof, and subjecting the molding to a pressure molding in the state of maintaining the original shape while the binding metal having the low m.p. is held melted. CONSTITUTION:The respective powder grains of the different metals having the different m.p. or the metals and nonmetallic materials are mixed and the powder mixture composed thereof is once molded under the pressure to form the rough molding. The difference in the m.-. of the mixed materials is made about 10-50 deg.C and the average grain size of the respective metals is made about <=3mm. The rough molding is heated in such a manner as to melt only the binding metal having the low m.p. while the shape thereof is maintained. The rough molding is molded to a desired shape by a die casting machine, etc., under said heating conditions. The heat of solidification is thereby made small and all of the cycle time, the rate of shrinkage and the strain after the molding are decreased. The metallic molding having the excellent strength and toughness is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a method for producing metal shapes containing different materials, which enables the different materials to be contained uniformly in high concentration,
It is easy to form, requires a small amount of solidification heat, completes solidification in a short period of time, has low solidification shrinkage, has little distortion, and has high dimensional accuracy.It is possible to expand the range of applicable alloy compositions and improve product grain size. The aim is to provide a method that allows for miniaturization and the production of products with excellent strength.

Industrial field of application A technology for manufacturing metal shapes and materials in which a substance having a composition different from that of the metal is bonded to the bonded metal.

Conventional technology By incorporating wear-resistant substances such as SIC% Al zO* into the bonded metal, the properties of the product can be greatly improved, increasing the demand for, for example, pistons, cylinders, and other sliding parts. The following methods are conventionally known as methods for producing metal shapes containing such dissimilar materials.

■ A method in which dissimilar metals or metal and nonmetal powders are mixed and then pressure molded, and the molded product is heated to form a slurry and the molten product is processed and molded (Japanese Unexamined Patent Publication No. 57-203733). .

(2) A method in which powder particles of a non-metallic substance are added and mixed into a semi-molten metal in a solid-liquid coexistence state, and then the metal is heated to a temperature higher than the liquidus temperature for casting.

Problems to be Solved by the Invention However, the above-mentioned method (2) has its own problems.

In other words, method (2) involves mixing dissimilar metals or metals and non-metals in a powder state, performing first pressure forming, heating the mixture to melt it into a slurry, and then performing second pressure forming. Therefore, even if a good uniform dispersion state is obtained during the first pressure molding, different materials will separate because they will be melted into a slurry state, and when mixed in a powder state and pressure molded. Therefore, it is not possible to obtain a metal material in a uniformly dispersed state.

In method (2), as the amount of the materials to be mixed increases, the apparent viscosity increases and mixing becomes difficult, and therefore high concentrations cannot be added.

Means for Solving the Constituent Problems of the Invention Mix powders of different metals or metals and non-metallic substances with different melting points, press-form the mixed powder once to form a rough compact, and then form the rough compact. A metal material containing dissimilar materials, which is heated to a temperature condition that melts only the bonding metal with a low melting point while maintaining the shape of the body, and is press-formed into a desired shape under these heating conditions. manufacturing method.

The heating conditions for action forming are such that the bonding metal can be melted while maintaining the shape of the rough compact, so the heating must be at a relatively low temperature. Since it is made under molten conditions, it has appropriate plasticity (@dynamicity), and it is possible to easily obtain a molded body of the desired shape while maintaining uniformity during powder mixing. .

EXAMPLES To further explain the present invention as described above, the present inventors have found that it is possible to uniformly contain dissimilar materials at a high concentration, and to ensure a dense structure throughout the body, even when the metal body has a complicated shape. As a result of careful consideration and speculation on how to obtain a method that can be easily manufactured, we have found that powder particles of dissimilar metals or metals and non-metal substances are mixed and once pressure-formed, the shape is maintained. It has been confirmed that the above object can be achieved by a relatively simple operation by press-forming the bonded metal into a desired shape while only the bonding metal is molten.

The metallic substances used in the present invention include not only pure metals but also
It is clear that an alloy may be used, and the nonmetallic substance is Ni.
,,Co,Cr5T1%V,Zr,WsMo
, 8N, Fe, Si, and other metal nitrides, oxides, carbides, borides, and other compounds, and graphite.

All of the above-mentioned substances are prepared in the form of fine particles or short fibers, and these are mixed in a proportion suitable for the intended purpose. Of course, this mixing may be not only a mixture of two kinds of powder particles, but also a mixture of three or more kinds of materials. Further, the fine grains may be flaky, granular, powdery, or blocky, and their average particle size is 3 yen or less, preferably 1 yen or less. The short fibrous material has an average length of 3 cranes or less, preferably 1 dragon or less, but when forming fine grains, the grain size is 50 μm or less. When mixing, it is convenient to use materials with similar dimensions to form a uniform mixed state. As the mixing method, any mechanical or other arbitrary method may be employed.

It is necessary to select at least one substance that has a lower melting point than the other substances to be mixed, and the difference in melting point is generally 10°C or more. Metals that can be easily formed by heating and melting the substance are used. For example, when using alloy fine grains consisting of Al-7%Si, Al-12%Si eutectic alloy fine grains and pure aluminum metal fine grains are used, and the overall composition is A1-
7% Si! If the metal body according to the present invention is manufactured by blending them so as to form an illumination, the heating temperature can be lowered,
Moreover, it is micro after manufacturing! Since the IJl weave can be made to have a structure similar to that obtained by melt-casting, it is easy to manufacture, and it is also possible to create a metal body with similar mechanical properties.

The mixture is press-molded in order to transfer heat during subsequent heating and melting and to facilitate handling. This pressure molding may be carried out to the extent that the above object is achieved in the present invention,
Since the strength and other properties of the product cannot be obtained by this, a so-called rough molded product that retains its shape as a molded product is sufficient, and is generally 0.1 to 2 t/c! Pressure A is adopted.

The rough molded body is then heated to facilitate molding, and is heated to a temperature that melts a portion of the powder particles. This heating is carried out to the extent that some of the powder particles of the heated body, which is a rough molded body, is melted, and the shape of the molded body is not destroyed. This makes it possible to maintain a uniformly dispersed state during powder mixing. If the bonding metal is a pure metal or a eutectic alloy, the heating temperature should be above the melting point, and should be 50°C below the melting point.
If heated to a higher temperature, the shape of the rough molded product cannot be maintained,
The temperature is set at 50° C. or lower because it melts into a slurry and different materials tend to separate, making it impossible to obtain a uniformly dispersed state. Further, in the case of an alloy having a solid-liquid coexistence region, the temperature may be above the liquidus line temperature, and if there is a large amount of bound metal, the solid-liquid coexistence temperature range of the metal may be used. The heating temperature can be appropriately determined depending on the type of bonding metal and the type and amount of added metal or non-metal, but for the reasons mentioned above, it is set to 50°C or less.

The heated rough compact can be formed into a metal body of a desired shape by any forming method such as die casting, extrusion, or forging, but since a portion is molten as described above, the forming pressure A relatively light acting force is sufficient, and a uniformly dispersed state can be reliably obtained when the powder is heated.

A specific manufacturing example of the product according to the present invention will be described below.

Production Example 1゜ Industrial purity aluminum powder with a particle size of 50 μm or less (
50 wt% of AN-12% Si powder (melting point of 577°C) having a particle size of 50 μm or less is mixed with 50 wt% of AN-12% Si powder (melting point of 577°C), and this mixture is molded into a powder compact of 60 cranes φ x 10 va t by 1.5 tons. The molded pieces were heated to 600° C. in a N2 atmosphere, and the six molded pieces were transferred to a die-casting machine, and molded by being press-fitted into a mold with a pressing force of 150 kg/-.

The Mi weave of the obtained product had a crystal grain size of 30 to 50 μm, and an industrial part having both high toughness and strength could be obtained.

Production Example 2゜Same Al-12%Si powder as in Production Example 1 8Qwt
% and 2Qwt% of SiC short fibers of 3 fins or less were mixed and then 700 kg/c+ was mixed into a 60 x 15 tat powder compact.
The product molded under a pressure of d was heated to 600°C in an Nt atmosphere, and five of the molded products were cast in a die-casting machine with a pressure of 200'kg/cal to form a fiber-reinforced product with uniformly dispersed fibers. A die-casting material was obtained.

Production Example 3 7 Qwt% of Al-0.1% Mg (melting point 655°C) powder with a particle size of 100 μm or less and ^I with a particle size of 100 μm or less
! -4%S+-1.0%Mn (melting point 630-577
°C) and 30 wt% and made into a powder compact of 6Q carbon mφ x 20 wm t with a pressing force of 1.5 t/crA, and after heating the three pieces of soybean to 630°C in this way, they were placed in a metal cavity. was press-fitted with a pressure of 180 ktr/ctl in a die-casting machine substituted with oxygen,
A die cast material corresponding to AA6351 was obtained. This product did not swell even after heat treatment.

"Effects of the Invention" According to the present invention as explained above, a rough compact formed by powder compacting is used, and this is heated to a temperature condition in which only the bonding metal is melted and the shape of the rough compact is maintained. By press-molding the desired product under pressure, it is relatively easy to obtain the desired product with the uniform dispersion state obtained when mixing powders, and the amount of solidification heat is small, reducing cycle time and shrinkage. Both the amount and distortion after forming are small, and the crystal grains are fine (Micro! 141) It is possible to appropriately control the texture and provide metal molded products with excellent strength and toughness, and its effects are industrially significant. This is a great invention.

Claims (1)

[Claims] Mix powders of different metals or metals and non-metallic substances with different melting points, press the mixed powder once to form a rough compact, and then maintain the shape of the coarse compact with a low melting point. 1. A method for producing a metal material containing dissimilar materials, characterized by heating to a temperature condition that melts only the bonded metal, and press-forming it into a desired shape under this heating condition.