JPH0353035A - Manufacture of composite material - Google Patents

Abstract

PURPOSE:To efficiently manufacture the homogenous composite material, at the time of adding an addition material for compounding to a molten metal, by adding a contamination material having specified grain size and the amt. to be added thereto, executing stirring and mixing and removing the contamination material by a filter prior to the solidification of the alloy material. CONSTITUTION:An alloy material (such as an Al-Si alloy) to form a matrix in a crucible 1 is heated and melted, to which an addition material for compounding (such as SiC grains having about 2 to 40mu grain size) is added, and stirring is executed to manufacture a composite material. At this time, a porous contamination material (such as SiC grains) having the grain size 5 to 5000 times the addition material is added thereto in the ratio of 2 to 10wt.%, which is rotatively stirred by a stirring rod 2 together with the addition material. Thus, the contamination material collapses the lumpy addition material condensed in a region Z1 and uniformly disperses the above into the alloy material. Next, prior to the solidification of the alloy material, a stopper 4 is raised to open a pouring gate 3; the incorporating material is removed via a filter, and the alloy material is poured into a mold and is solidified. In this way, the composite material in which the addition material is uniformly dispersed can be obtd.

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention involves adding ceramic or non-metallic particles, whiskers, short fibers, etc. to a completely molten or partially molten metal, especially an alloy material such as aluminum, and adding g! The present invention relates to a method of manufacturing a composite material by applying mechanical rotational stirring.

b. Conventional technology A method (compocasting method) is known in which composite materials are manufactured by adding ceramic or nonmetallic particles to a partially molten bear alloy material and applying mechanical rotational stirring. In this method, as shown in FIG. 1, a stirring rod 2 that can be raised and lowered is provided in a crucible 1 placed in a melting furnace, and the molten metal in the crucible 1 is stirred by the stirring rod 2. Furthermore, a pouring spout 3 is provided at the bottom of the crucible 1, and the tip of a stopper 4 that moves up and down is engaged with and disengaged from the pouring spout 3, so that the molten metal in the Lupo 1 with the added material sufficiently diffused is poured into a mold etc. placed at the bottom. It was designed to be poured with hot water.

In addition, as other prior art, Japanese Patent Application Laid-Open No. 63-2169
No. 19 “Method for manufacturing Al-Cu-Tie alloy composite material” has been published. C. Problems to be Solved by the Invention When the apparatus shown in FIG. 1 is used to melt an alloy that will become a matrix in a melting pot, and an additive material to be compounded is added thereto, and the mixture is stirred with a stirring rod 2, the alloy material If there is a difference in specific gravity between the molten alloy and the additive material, or if an additive material with poor wettability is used, the additive material will not easily diffuse into the molten alloy. Each particle constituting the additive material tends to aggregate in the upper, lower, or lateral direction of the molten alloy within the crucible, and as shown in FIG. There was a problem in that it agglomerated to form a lumpy residue.

In addition, in order to solve the above problems, as shown in Fig. 3, a structure is adopted in which a part of the pouring spout 13 and a part of the stock bar 14 are recessed into the wall of the crucible 11, which is constructed to be particularly thick in some parts. However, as shown in FIG. 4, a region Z2 where the additive material aggregates also appeared.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for manufacturing a composite material that solves the above-mentioned problems.

d. Means for Solving the Problems In accordance with the above object, the present invention provides a method for manufacturing a composite material by adding an additive material for composite to molten metal, stirring it, and solidifying the mixture. 5-50
00 times the particle size and in a proportion of 2 to 1Qwt% is added to the molten metal and stirred together with the added material, and then, prior to solidification, the mixed material is filtered through a filter. The above problem was solved by removing it.

Examples of the present invention will be described in detail below.

The apparatus used has the conventional structure shown in FIG. 1 or 3 above.

The alloy material that becomes the matrix includes the commonly used Al-Si alloy, for example, Al! ．． -17wt
%Si alloy etc. is used.

The additive material used for the composite is a conventional additive material, such as SLC particles having a particle size of 2 to 40 .mu.m.

Ingredients to be added separately (To avoid confusion, adder #4 below)
In contrast to the conventional additive material 4, hollow or porous particles with a particularly larger diameter are used as additives. Spherical 1
For example, the same material may be fused together and used, such as a square shape. For example, 2 to 101 t% of SiC particles having the same composition and having a particle size of 50 μm to 1 OfflIm are mixed into an additive material composed of SiC particles having a particle size of 2 to 10 μm.

The particle size of the mixed material was set to 50 μm to 10 μm.
If the particle size is less than 0 μm, it cannot be distinguished from the particles of the original additive zero 4 to be compounded, and there is little effect on improving the efficiency of compounding. If the particle size is 10 μm or more, the particles are too large and the stirring during compounding is difficult. During the south collision with the stirring bar, I lost the stirring rod,
This is because it interferes with stirring. In addition, this material itself is broken, and its fragments remain in the manufactured composite material, which is undesirable. Furthermore, the ratio of the diameter of this material to the added material is expressed as a multiple. and 5-5000
It will be twice as large.

Also, the reason for setting the mixing ratio to 2 to 10 wt% is that if it is less than this, the desired effect cannot be achieved, and if it is more than this, the additive material to be depolymerized may be an alloy material. 8.It becomes a hindrance to mixing into hot water, which is not desirable.

This large-diameter Hijin material does not have to have the same composition as the additive material for the composite, and may be infusible and hollow or porous, for example, using a Shirasu balloon (hollow Sioz particles, etc.). Good too. As porous particles, for example, SiC particles with a diameter of 10 μm are collected, and by making them into dumplings and baking them to harden them, a porous lump with a large diameter can be obtained. Incidentally, the whitebait balloon is made by heating whitebait, which is an inexhaustible natural resource in our country, and foaming it into a hollow spherical shape to form a small hollow glass sphere.

Now, using the conventional apparatus shown in FIG.
The alloy material serving as a matrix is heated and melted in the melted alloy, and the additive material and the large-diameter mixed material are introduced into the melted alloy at the same time or at intervals, and a stirring rod 2 is inserted. and give rotational stirring, ? 8. The presence of large-diameter contaminants that are thrown into the molten metal and stirred makes it difficult for the additive material to form agglomerates, and also collides with the aggregated additive material to break it down. . Since the hollow or porous mixed material has a greater buoyancy than the additive material for composites, it floats on the molten metal and collides with the lumpy additive material that aggregates in area Z1 shown in Figure 2, destroying it. become.

After the additive material has been sufficiently destroyed, the molten alloy, which has partially formed a solid phase inside the crucible during processing, is returned to a completely molten state and passed through a filter placed at the bottom of the pouring spout. Then, collect it in the mold and solidify it. This results in a composite material from which large particulate contaminants have been removed.

In addition, even when using a mixed material of the same material as the additive material,
Remove through a filter. This is because if a large-diameter mixed material is mixed into the manufactured composite material, the original strength of the composite material itself cannot be changed.

Next, a concrete example will be explained. First, A1-17W is used as the alloy material that becomes the matrix.
Using t%Si (8STM A390), this was melted at 800° in the Lupo of the above device. Next, 15-L% SiC particles with an average particle size of 3 μm were added to the melted matrix alloy, and at the same time, SiC particles with an average particle size of 10 μm were added to the melted matrix alloy.
Similarly, 511 t% of Sankirite (Shirasu Balloon, trade name: Nisanki Kogyo) of μ-th grade is added. While stirring with a stirring rod, the mixture is cooled to around 650°C (in this case, a solid phase is partially generated) and heated again to around 800°C to return to a completely molten state.

Next, the stopper is raised, and the molten metal is poured into the mold from the spout, cooled, and collected as a solidified mass. Contaminated sunkirite is removed by a filter that passes through the metal before pouring it into the mold. This filter used a mesh filter with a mesh smaller than Sankyrite and larger than Sic particles. e. Effects of the Invention As described above, the method of the present invention destroys the lumps of additive material that occur during stirring, promotes uniform dispersion of the additive material into the alloy material, and efficiently produces homogeneous composite materials. It can be manufactured.

[Brief explanation of drawings]

1 and 3 show a composite material manufacturing apparatus, and the second
FIG. 4 is a plan view of FIG. 1 and FIG. 3, and is a diagram for explaining how problems occur when using these devices. 1... Crucible, 2... Stirring rod. Patent applicant Suzuki Motor Co., Ltd. (and 2 others) Figure 1 Figure 2 Figure 5 Figure 4 Procedural amendment (voluntary)

Claims (1)

[Claims] 1) When producing a composite material by adding an additive material for composite to molten metal, stirring it, and solidifying it, particles of 5 to 5000 times the size of the additive material. It has a diameter,
and other contaminants in a proportion of 2 to 10 wt% are added to the molten metal and stirred together with the added materials, and then the contaminants are removed by a filter prior to solidification. Production method. 2) The method for producing a composite material according to claim 1, wherein the mixed material is the same material as the additive material, or a hollow or porous infusible material.