JPS6283440A - Metal combined with heat resistance crystalline fiber and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a metal combined with crystalline fibers having superior heat resistance by melt-bonding and joining the mutual contact points of ceramic fibers to each other with frit in a preform and filling Al, an Al alloy, Mg or an Mg alloy into the voids in the resulting preform. CONSTITUTION:A preform consisting of 4.5-35wt% frit, 8-10wt% org. binder and the balance heat resistance crystalline fibers is heat treated to vanish the binder by burning and to melt-bond and join the mutual contact points of the fibers to each other with the frit, so a preform having 75-95% void volume is obtd. Al, an Al alloy, Mg, or an Mg alloy is melted and filled into he pre form.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has excellent friction, wear properties, elastic modulus, and strength: @thermal crystalline fiber composite gold, I! It relates to the manufacturing method of the same, and can be used for automobile engine pistons, construction equipment, etc.

[Prior art and problems to be solved by the invention] Conventionally, it has not been known to combine heat-resistant crystalline fibers with gold as a reinforcing material to improve the strength, heat resistance, abrasion resistance, etc. of gold irises. ing.

The manufacturing method for such a fiber composite metal is to mold it into a predetermined shape in advance, fix the fiber IJv shape (hereinafter referred to as an intermediate molded product) in a predetermined position in a die for elution forging, and then mold it into a gold 114 molten metal. A commonly used method is to apply pressure to the mixture and inject it into the intermediate molded body. At this time, if the strength +W of the intermediate forming wire is not sufficiently large, there will be a problem that the intermediate forming body will be deformed and damaged during elution injection, and the fibers will not be composited in a predetermined position and shape.

Conventionally, it has been known that molded bodies of heat-resistant crystalline fibers are used alone or in combination with inorganic binders such as silica sol, alumina sol, clay, or organic binders such as latex. is obtained by suction filtration molding a slurry made of the binder and heat-resistant crystalline fibers, and then drying the slurry. The molded product obtained in this way may have insufficient strength, or the strength of the molded product may be significantly uneven due to migration, a phenomenon in which binders such as silica sol and alumina sol move to the surface layer during drying and become concentrated. Therefore, when used as an intermediate molded body of a blanked alloy, there arises a problem that deformation and finger tinting occur during injection of elution. In order to eliminate these problems, migracilon can be made into #tLt by gelling the binder, etc.
If the crucible containing the binder is increased, the viscosity of the slurry increases, making suction molding extremely difficult, and the drying of the binder causes significant drying shrinkage of the molded product, resulting in a nitrogen porosity of 90%. There has been a problem in that it is extremely difficult to obtain molded products with a low electric density that exceeds the current density.

As a method to solve such problems, Japanese Patent Laid-Open No. 59-18
No. 1189 discloses a method for producing a reinforced molded body for producing composite materials. However, in this method, a slurry of silica sol and heat-resistant crystalline fibers is suction molded, the resulting molded product is impregnated with sodium silicate, and further dried, after which it becomes hard due to the migration of the binder. There is a problem in that the surface layer must be ground through many complicated steps.

[Means for solving problems]

The present invention solves several of the above drawbacks by filling a molded product with metal such as aluminum.1. The purpose of this invention is to provide a composite metal with excellent strength, heat resistance, wear resistance, etc., and #14#' in claim 1! The above object is achieved by providing a crystalline fiber composite metal and a method for manufacturing the same.

The heat-resistant crystalline fiber used in the present invention preferably has a heat resistance of 1000''C or more, such as alumina crystalline fiber, mullite crystal 'a' fiber, or zirconia crystalline fiber.

Next, the frit used in the present invention will be explained.

The frit used in the present invention is made by joining the contact points of the heat-resistant crystalline fibers in the #4 thermal crystal 'a fiber intermediate molded body before injecting the molten metal, and when injecting the molten metal, the intermediate b'2 Its role is to prevent deformation and damage to the shape, so metals such as aluminum that soften and melt at around the melting point of 800°C are not effective.
In addition, the strength of heat-resistant crystalline fibers decreases significantly.
Frits that do not adhere to MjII unless the temperature exceeds 200"C cannot be used in the present invention. For this reason, the frits used in the present invention include borosilicate threads, calcium borate threads, and silicic acid threads. Calcium thread, sodium silicate, etc. are preferable.

The present invention involves making a molded body using heat-resistant crystalline fibers, 7 liters, and an organic binder such as latex that is completely burnt out at temperatures above 800°C, and heat-treating the molded body. As a result, the organic binder is burnt out, and at the same time, the points of contact between the fibers of the heat-resistant crystalline fibers are fused and bonded using a frit, and a uniform and high-strength intermediate formed body is filled with metal such as aluminum.

Next, we will explain the reason for limiting the mixing ratio of each material used when manufacturing the heat-resistant crystalline fiber composite metal of the present invention. 3. If the frit is less than 4.5 wt%, the strength of the intermediate molded product will be insufficient; If it exceeds 84 vt%, poor penetration of the molten gold will occur, so it is necessary to keep it within the range of 4.5 to 84 wL'J. If the heavy binder is less than 3wt%, the strength of the molded product before firing will be insufficient, making it difficult to handle.
If it exceeds J, lQwt%, a problem arises in that the time required to burn out the binder increases, so it must be within the range of 3 to lQwt%.

Next, a method for manufacturing the heat-resistant PL crystalline fiber composite metal of the present invention will be explained. First, heat-resistant crystalline fiber,
Add the frit and the binder to water and stir and mix thoroughly to create a slurry. A commercially available flocculant is added to this slurry, stirred, mixed, suction filtered, molded, and dried to produce a molded body. Next, this molded body is heat-treated at an opening degree of 800 to 1000°C [7] to burn out the organic binder and increase the porosity to 75 to 95.
Intermediate l consisting of heat-resistant crystalline fiber of Φ and frit
Create a jv feature. This intermediate molded body is fixed in a predetermined position in the hot granite forging mold 1, and pressure is applied to the metal bath surface to inject the molten metal into the gap of the intermediate molded body and solidify it.

[Action and effect]

The heat-resistant crystalline fiber composite metal of the present invention uses frit as a binder for the heat-resistant crystalline fiber intermediate molded product, and has the following effects. .

The particle size of frit is from several microns to several tens of microns, which is larger than conventionally used binders such as silica sol and alumina sol, so the binder moves to the surface layer and becomes concentrated when it dries after suction molding. It is uniformly dispersed in the molded product without migration.

Further, the frit used in the present invention is melted by heat treatment, and the contact points of the heat-resistant crystalline fibers are fused and joined. For this reason, the heat-resistant crystalline fiber intermediate molded body used in the production of the composite metal of the present invention has high strength and is uniform in strength, so it does not deform or deform when injecting the gold-molten metal. It is not possible to obtain a rigid alloy with a predetermined shape without causing damage.

Furthermore, the reason why the frit used in the present invention has the above-mentioned bonding effect is because the contact points of the heat-resistant crystalline fibers are fused and bonded together by heat treatment, and the frit does not have any bonding effect before heat treatment. do not. Therefore, in the present invention, it is possible to easily produce an intermediate molded body with a high porosity, which was extremely difficult to obtain when using a binder such as silica sol or alumina sol that produces a binding effect by drying and solidifying. It has the characteristic that it is possible to obtain a composite metal lt with a small ratio.

〔Example〕

Next, the present invention will be explained with reference to examples.

Example 1 Commercially available alumina crystalline fiber 1729. Calcium silicate frit 9f, acrylonitrile butadiene latex (solid content 40%) 14rl17? 1950
The mixture was poured into 0 ml of water and thoroughly stirred and mixed.

To this slurry, 75 ml of 0.05% aqueous solution of acrylamide flocculant 1% sulfuric acid band 10% aqueous solution [5Bm#] was added and thoroughly stirred and mixed. The slurry thus prepared was made into paper using a square hand paper machine, dried, and then heat treated at 900°C for 80 minutes for 150 x 150 ms.

An intermediate molded body having a thickness of 10 wl and a porosity of 75% was obtained.

This intermediate formed body is placed in a mold for molten metal forging, and
Inject molten aluminum at 50°C and produce 1000kg/
Aluminum (loss) ram was filled into the intermediate molded body under a pressure of ci and solidified to obtain heat-resistant crystalline fiber composite gold scrap of the present invention.

Example 2 17 g of commercially available alumina crystalline fiber 5811 calcium silicate free-ft, acrylonitrile butadiene latex (solid content 40%) 9me1 acrylamide flocculant 0.05% water soluble'N! 150 x 150 fl, thickness 1 in the same manner as in Example 1 using iaoml, 20 ml of 10% aqueous solution of band sulfate, 5 ml, and 7800 ml of water.
An intermediate molded body having a diameter of 0.01 m and a porosity of 90% was obtained. Using this intermediate compact, a heat-resistant crystalline fiber composite metal of the present invention was obtained in the same manner as in Example 1.

Example 8 Commercially available alumina crystalline fiber 44g, calcium borate frit 28f1 acrylonitrile butadiene latex (solid content 40%) 19mJ.

150 x 150+a+ in the same manner as in Example 1 using 80 mg of 0.05% aqueous solution of acrylamide flocculant, 1 O% aqueous solution of sulfuric acid, 2 omNs and 7800 mg of water.
An intermediate molded body having a thickness of 10 fl and a porosity of 90% was obtained. Using this intermediate molded body, the heat-resistant crystalline fiber of the present invention was prepared using the method σ) in the same manner as in Example 1. Ji! 1jlt of alloy metal
:.

Example 4 Commercially available zirconia crystalline fiber 28411 fermented calcium yarn frill-16N, Acrylic L1 nitrile butadiene latex (solid content 40%) 89111#, Acrylamide yarn coagulant 0.05% water bath 76rnl,
Sulfuric acid band 1 (1% aqueous solution 57 ml 1 water 195 (1
150 x 1 using the same method as in Example 1 for 0+J
An intermediate molded body having a size of 50 wx, a thickness of H)#, and a void of 75% was obtained. This intermediate formation 1 "≧ body was used and Example 1 and 1rt1
The heat-resistant crystalline fiber composite metal of the present invention was obtained by the Jj method of the present invention.

Example 5 Commercially available mullite crystalline fiber 261/, calcium borate yarn frit 6y, acrylonitrile butadiene yarn latte, lx (solid content 40%) 4 scoops, acrylamide yarn Ml 15me1 sulfate band 10% water soluble 10me, The same method as in Example 1 was used using 400Qml of water.
An intermediate molded body having a thickness of 1011 mm and a porosity of 95% was obtained. Use this intermediate b12 shape 1/real (]
A heat-resistant crystalline fiber composite of the present invention @1 was obtained by the lj method of Example 1 and times (:).

Example 6 Commercially available alumina crystalline fiber 24y1 Calcium borate frit 18y, Acrylonitrile butadiene latex (solid content 40%) 5n17? , Acrylamide yarn flocculant 154 inches, Band sulfate 10% aqueous solution 1ora
Example using e, water 400011ψ! The same method as
An intermediate lJy shape of 150 x 15011 Jf, thickness 101311, and 95% porosity was obtained. Using this intermediate compact, a heat-resistant crystalline fiber composite metal of the present invention was obtained in the same manner as in Example 1.

When the heat-resistant crystalline fiber-comprising metal of the present invention obtained in Example 1 was cut in this way and the cross section was inspected, it was found that heat-resistant crystalline fibers were composited in a #T regular shape. No deformation of the middle hk shape due to filling was observed.

Furthermore, the ceramic-tsukufiber composite metal of the present invention was excellent in mechanical strength and abrasion resistance.

Claims (1)

[Claims] 1. A porosity of 75, consisting of 5 to 35 wt% frit, the remainder being heat-resistant crystalline fibers, and the contact points of the ceramic fibers being fused and joined by the frit.
The voids of the molded body within the range of ~95% are aluminum,
A heat-resistant crystalline fiber composite metal filled with one metal selected from aluminum alloy, magnesium, and magnesium alloy. 2. The frit is one or more types selected from borosilicate-based, calcium borate-based, calcium silicate-based, and sodium silicate thread frits. Heat-resistant crystalline fiber composite metal according to item 1. 3. Claim 1, wherein the heat-resistant crystalline fiber is one or more selected from alumina crystalline fiber, mullite crystalline fiber, and zirconia crystalline fiber. Or the heat-resistant crystalline fiber composite metal according to item 2. 4. Frit 4.5-34wt%, organic binder 3-10
wt%, the balance consisting of heat-resistant crystalline fibers is heat-treated to burn off the organic binder,
and the contact points between the fibers of the heat-resistant crystalline fibers are fused and joined by a frit to form a molded body with a porosity of 75 to 95%, and aluminum molten in the voids of the molded body,
A method for producing a heat-resistant crystalline fiber composite metal, characterized in that it satisfies any one metal selected from aluminum alloy, magnesium, and magnesium alloy. 5. The frit is one or more types selected from borosilicate-based, calcium borate-based, calcium silicate thread, and sodium silicate-based frit. 4. The method for producing a heat-resistant crystalline fiber composite metal according to item 4. 6. Claim 4, wherein the heat-resistant crystalline fiber is one or more selected from alumina crystalline fiber, mullite crystalline fiber, and zirconia crystalline fiber. Section or 5th
A method for producing a heat-resistant crystalline fiber composite metal as described in 2. 7. The method for producing a heat-resistant crystalline fiber composite metal according to any one of claims 4 to 6, wherein the heat treatment is performed at a temperature in the range of 800 to 1000°C.