JPS60138041A - Ceramic-metal composite body and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture efficiently a ceramic-metal composite body by adding a starting material for ceramics to a molten metal contg. a I A or IIA group metal in the periodic table or a compound of the metal as an auxiliary. CONSTITUTION:One or more among Al, Ti, Mg, Fe, Cu, Cr and Ni are melted, and one or more kinds of components selected among Be, Ca, Sr, Ba, Li, Na, K, Rb, Cs and compounds of the metals are added as an auxiliary. To the molten metal is then added a starting material for ceramics such as SiC, SiO2, Si3N4, B4C, BN, AlN, Al2O3, BeO, cordierite, ferrite, thoria, aluminum titanate, carbon or a carbon compound. A ceramic-metal composite body can be efficiently obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic-metal composite and a method for manufacturing the same, and particularly relates to a ceramic-metal composite and a method for manufacturing the same.

When producing a composite of ceramic raw materials selected from sulfides, borides, or silicon compounds and various metals, auxiliary agents such as alkali metals or alkaline earth metals are added and dispersed in the melt of the metals. The present invention relates to a ceramic-metal composite and a method for manufacturing the same.

In recent years, in order to obtain new materials having various properties suitable for various purposes of use, research has been carried out on composites made of combinations of various ceramic raw materials and metals.

Various methods such as molten metal processing, casting, sintering, diffusion, and injection methods can be used to obtain the above composite, but melts of various ceramic raw materials and metals are inherently miscible with each other. It has a difficult nature.

Therefore, the present inventors have been researching and examining the effectiveness of auxiliary agents that make it easier for these melts to mix with each other when producing composites of the various ceramic raw materials and metals. As an auxiliary agent, the periodic table of elements Group 1 A or Group 1 [
The present invention has been completed based on the new finding that metals selected from A or their compounds are optimal and can also be an effective composition of composites. Ta.

Hereinafter, the composite of the present invention and its manufacturing capacity will be explained in detail.

In the production of a composite of a ceramic raw material and a metal, the present invention provides an auxiliary agent that has an affinity with the elements or metals constituting the ceramic raw material, and that can cause a chemical reaction to form a stable compound. By incorporating it as a third component into the ceramic raw material and/or metal melt, the dispersion effect is enhanced and a ceramic-metal composite can be efficiently obtained.

In other words, aluminum or other molten metal is mixed with silicon carbide,
Carbides such as silicon nitride, silicon dioxide, etc.

As a method for uniformly dispersing fine powders or granules of various ceramic raw materials such as nitrides, oxides, and borides, for example, alkali metals or alkali metals such as metallic calcium or lithium are added to aluminum or other molten metal as an auxiliary agent. Once added, the auxiliary agent immediately undergoes a chemical reaction while generating heat, and easily dissolves into the molten aluminum. At this time, the molten aluminum does not undergo any particular thickening phenomenon, and forms a Q coating, slag, etc. on its surface. Next, silicon carbide.

When various ceramic raw material powders or granules such as silicon nitride and silicon dioxide were slowly added to the molten aluminum, the ceramic raw materials floated on the surface of the molten aluminum at first, but due to the stirring effect, the ceramics gradually formed. The raw material penetrates into the molten aluminum, and as time passes, an oxide film and slag are formed on the surface of the molten aluminum. Therefore, it has been found that if these are continued to be vigorously stirred, the fine powders and granules of the ceramic raw materials are melted into the molten aluminum, and a new composite material can be manufactured. This is because ceramic raw materials mixed into metal composite materials generally have poor wettability with molten metal, and there is a difference in specific gravity between the two, so even if ceramic raw materials are added to molten metal and thoroughly stirred, both However, according to the present invention, auxiliary agents such as alkaline earth metals and alkaline earth metals are used. By intervening, metals and ceramic raw materials have a strong affinity with the auxiliary agent, making it easy for chemical reactions to occur, and the dispersion effect is promoted, improving the compatibility between metals and ceramics, and dispersing them in a mutually molten state. It is assumed that Factors that improve dispersibility in this way are thought to be related to the mechanical properties, aggregation state, and surface properties, particularly wettability, of the ceramic raw material and metal powder. Also,
Temperature, pressure and residence time as controlling factors for dispersion conditions.

By optimizing these conditions such as action time, etc., it is possible to appropriately control the apparent viscosity, flow characteristics, dispersion stability, and changes over time when ceramic raw materials are added and mixed into molten metal. . In particular, the dispersion process of the molten metal differs depending on the viscosity of the system, but according to the present invention, when producing a composite of ceramic raw materials and metal, the viscosity of the molten metal is adjusted appropriately by intervening an auxiliary agent. Furthermore, due to the high reactivity between the auxiliary agent and the elements or metals constituting the ceramic raw material, a polydispersion effect with a strong affinity between the two is enhanced, which is favorable for the formation of composites. considered to be a thing. On the other hand, it is conceivable that the smaller the particle size of the ceramic raw material or metal powder, the higher the viscosity even if the volume fraction of the dispersed phase is the same.

This is thought to be because as the particle size becomes smaller, the interparticle gap decreases and the interfacial area of the particle medium increases.

As explained above, the dispersion of molten metal is governed by and can be controlled by various factors, but at least when producing a composite of ceramic raw materials and metal as in the present invention, dispersion of molten metal is controlled by various factors. It has been found that by using metals and their compounds with high chemical reactivity and affinity with elements and metals as auxiliary agents, it is possible to improve the dispersion effect and obtain composites of ceramics and metals. A composite suitable for the application can be provided.

As the most typical embodiment of the present invention, metal is
Reminium, ceramic raw material is silicon carbide 1 fine powder.

The case where the auxiliary agent is metallic calcium will be specifically explained.

As a molten metal processing method in which aluminum is melted and silicon carbide fine powder is added and mixed into the molten metal, a molten metal crucible equipped with a heating stirring device as shown in the cross-sectional view of FIG. 1 is prepared.

In this figure, 1 is a heat-resistant crucible, 2 is a power source, 8 is a stirring rod, 4 is a thermocouple, 5 is a heating element, and 6 is a small fJl Erema furnace.

Then, aluminum having a purity of 99.9'%, high purity α-type silicon carbide fine powder, and metal powder having a particle size of 8 to 4 mm are respectively prepared.

First, aluminum is melted in advance at a temperature of 700 to 800° C. in the molten metal crucible, and the molten aluminum is continuously stirred at about 50 Or, p, m. Next, 2% by weight of metallic M-sium is added to the aluminum, and after the M-sium melts into the molten aluminum and thickens, α-type silicon carbide fine powder (purity of about 97 cm) with an average particle size of 40 μm is added. 10 parts by weight of the aluminum was gradually added. the result,
Immediately after addition, silicon carbide floated to the surface of the molten aluminum, but as the slag film broke down due to stirring, the oxide film on the surface of the molten aluminum melted into the vortex of the molten metal, showing good dispersibility. .

The composite thus obtained was cooled, the agglomerated material was cut, and a photograph taken with an SEM (scanning electron microscope) and a model diagram of its interface are shown in FIGS. 2 and 8. This photograph is about 150 times larger, but the pores that appear to have been caused by the thickening of the molten aluminum due to the addition of calcium are slightly swollen, as shown in Figure 3. Ca5t (Q and C
It can be seen that a-Al([) is present.

As described above, according to the present invention, by using an auxiliary agent such as iron to obtain a composite of a ceramic raw material and a metal, the viscosity of the molten metal increases, and the metal and ceramics are bonded together. In addition, K acts as a third component that chemically reacts with the elements or metals constituting various ceramic raw materials to form stable compounds. By adding auxiliary agents,
Enhance the dispersion effect between ceramics and metals through auxiliary agents,
In addition, K increases the affinity between the two, making it possible to obtain a novel composite that has the characteristics of ceramics and metals. As the auxiliary agent, in addition to Mg, Mg, which has a similar function, may be used.
.

Alkaline earth elements such as Be, Sr+ Ba, Ra, and Li.

Alkali metals such as K, Rb, and Cs are considered effective. In addition to the metal aluminum mentioned above, Mg+ Sn+ Pb+ Be+ Sir Se, T
i, V, Cr, Mn, Fe.

Go,' Nt, Cu, Nb, Mo, Tc,
Ag, Cd, In, Hf, Ta.

W, Ir, Pt, Au, TI, Th, Pa
, UISb, As, Ru.

Rh, Pd + Te, Po, Re, Os or any one or more selected from among;
Especially A1. TL Mg+ Fen Cu,
Cr+Ni and the like are promising metal materials. In addition to the silicon carbide, various carbides listed in claim 3 and nitrides and oxides listed in claims 4 to 6.

It has been found that sulfides and the like are useful as raw materials for ceramics.

On the other hand, methods for obtaining lumps of ceramics, metals, and various composites include, in addition to the molten metal treatment method described above, liquid casting methods, such as (a) melt infiltration method, and (b) pressure casting method.

(C) Various casting methods such as vacuum casting method, and furthermore, sintering method.

The principle idea of the present invention is also considered to be useful in impregnation methods, diffusion bonding methods, and the like.

As described above, according to the present invention, it is possible to efficiently produce composites of ceramics and metals with poor wettability and dispersibility, which has been difficult with conventional techniques. It is possible to provide a composite material that can be reasonably obtained and is useful for various applications requiring high-temperature heat resistance and fire resistance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an example of the apparatus for manufacturing a composite of the present invention;
FIG. 2 is a cross-sectional photograph of an example of the ceramic-metal composite of the present invention, and FIG. 8 is an interface model diagram of the composite. Patent applicant IBIDEN Co., Ltd. Representative Jun Taga

Claims (1)

[Claims] 1. A ceramic-metal composite consisting essentially of a ceramic raw material, a metal, and an auxiliary agent that forms a stable compound with the element or metal constituting the ceramic raw material. 2. The ceramic raw material is any one or two of carbides, nitrides, oxides, sulfides, borides, and silicon compounds.
2. The complex according to claim 1, which is composed of more than one species. 3. The carbide is SiC+ TiCu Cr5Q+
ALCs, BtC+TaC, jJC, HfC, We
, ZrC, or two or more thereof. 4- The nitride is +5tJJ4. A11th B
9. The composite according to any one of claims 1 to 8, which is any one or more of N+ Til'L VC+TaNI ZrN. 5. The oxides include: Sin, Zr, AlmOs
,'Be1l MgO. Ferrite, Sialon, Dimcon, Beryllium, Thoria, Steatite, Phonoresterite, Mullite. Cordierite, diconia, aluminum titanate. Claim 1 characterized in that it is any one or more of lithium oxide, carbon, or carbon compounds.
The complex according to any one of Items 1 to 4. 6. The sulfide is 9MoSz, WS*, pbs, B
The complex according to any one of claims 1 to 5, characterized in that it is any one type or two or more types of tsSs. 7. The metals are AI, Mg, Sn, Pb
, Be, Si, Se. Ti, V, Cr, Mn, Fe, Go, Ni
, Cu, Nb, Mo, Tc. Ag, Cd, In, Hf, Ta, WIIr,
Pt, Au +T1. Th. Pa, tL Sb, Bi, As, Ru, Rh
, Pd, Te, Po, Re. The composite according to any one of claims 1 to 6, characterized in that it contains one or more types of Os. 8. Claim 8, characterized in that the auxiliary agent is one or more of metals selected from Group 1 A or Group Ⅰ A of the Periodic Table of Elements or compounds thereof. 1
The complex according to any one of Items 6 to 6. 9. The ceramic raw material is SiCu 5LN4+ St
ow, and the metal is All
Ti, Mg. Any one or more of Fe + Cur Cr + Ni, and the auxiliary agent is Mg + Be, Ca
*Sr*Ba, Ll, NarK, Rb,
2. The complex according to claim 1, which is one or more of Cs. 10, SiCu 5io1.5isNn, B4CI B
NI AINI ALOs+BeO. A ceramic raw material of one or more of cordierite, ferrite, thoria, aluminum aluminum titanate, carbon, and carbon compounds, and AI, Ti, Mg,
Fe. Any one or more metals of Cu+Cr+Ni, Be, Ca, Mg, Sr+ Ban Lit
The complex according to claim 1, which essentially consists of one or more auxiliary agents selected from Na, K+Rb4Cs. 11. In producing a composite of a ceramic raw material and a metal, one or more of the metals selected from Group 1 A or Group 2 A of the Periodic Table of Elements or a compound thereof may be used as an auxiliary agent. 1. A method for producing a ceramic-metal composite, which comprises incorporating and dispersing it in a ceramic raw material and/or metal melt. 12, 5iC-+ 5iOst 51mN5. B4
A1. In producing a composite with one or more metals of Mg, FenCu, Cr, and Ni, Be, Ca, Sr+ Ba. It is characterized by containing and dispersing in the ceramic raw material and/or metal melt one or more kinds of auxiliary agents selected from Li, Na, K, Rb, and C8 or their compounds. A method for manufacturing a ceramic-metal composite. 13. A method for producing a ceramic-metal composite, which comprises melting a metal or alloy containing the auxiliary agent and incorporating the ceramic raw material into the molten metal.