JPS6053101B2 - Nickel chromium alloy composite material and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nickel-chromium alloy composite material and a method for manufacturing the same.

In particular, the present invention provides a nickel-chromium alloy composite material that has excellent heat resistance, corrosion resistance, oxidation resistance, abrasion resistance, hardness, and strength, and is made by strongly bonding a nickel-chromium alloy, carbides and silicides of the alloy, and SiC to each other. and its manufacturing method. Nl. 15Cr has a wide solid solubility limit and exhibits a eutectic reaction.

This type of alloy has excellent heat resistance and corrosion resistance;
It has characteristics such as high electrical resistance. Conventionally, this type of alloy has been put to practical use as heating wires and heat-resistant structural materials. However, the oxidation resistance of these alloys at high temperatures is limited. Currently, for the purpose of improving oxidation resistance, MO, W. ．． C.O. ．． Si. Although many experiments have been conducted to add various elements such as sAl and Ce, a fully satisfactory material has not yet been obtained. The present invention provides a nickel-chromium alloy composite material that is significantly superior in high-temperature oxidation resistance, corrosion resistance, wear resistance, hardness, and strength compared to conventional nickel-chromium alloys, and a method for producing the same.

The present invention provides Ni. ．． Cr
、． At least one carbide selected from Si and Ni. ．． A nickel-chromium alloy composite material having a structure in which at least one type of silicide selected from Cr exists, wherein the nickel-chromium alloy, carbide, and silicide are uniformly dispersed, and the interface of the dispersed particles is It is formed from a fastening gradual phase shift of nickel chromium alloy, carbide, and silicide, and the size of the carbide and silicide is 0.
．． This objective can be achieved by a nickel-chromium alloy composite material having a structure of 3p or less and having excellent heat resistance, corrosion resistance, oxidation resistance, abrasion resistance, hardness, and strength, and a method for producing the same.

Next, the present invention will be explained in detail.

The composite material of the present invention has at least one selected from nickel carbide, chromium carbide, and silicon carbide and at least one selected from nickel silicide and chromium silicide between the nickel-chromium alloy powder particles. It is a structure in which the particles are finely and uniformly dispersed and strongly connected to each other, and this group. The interface of the particles constituting the weave is formed of the fastening gradual phase shift of the nickel chromium alloy, carbide, and silicide, and the size of the carbide and silicide is 0.
．． This is a composite material consisting of a novel structure characterized by having 3p or less.

In the present invention, the carbide and silicide are very fine particles with a size of 0.3p or less because the carbide and silicide have carbon and silicon as their main skeleton components, as will be described in detail later. Carbides and silicides of nickel chromium, which are generated when highly active free carbon and free silicon are combined with the base matrix Ni-Cr alloy, and the above-mentioned free carbon and free silicon. It is amorphous and/or β-type SiC that is formed by combining with SiC, and these carbides and silicides are finely intermixed and bonded, so even when the composite material of the present invention is manufactured by high-temperature heating, , the growth of each Ni-Cr crystal grain is inhibited by the presence of foreign particles of 0.3p or less such as carbides, silicides, etc. in the grain boundaries. It is thought that the crystal grains have an ultra-fine grain size of 15 to 30p or less.

It should be noted that general composite materials cannot avoid the drawback that when heated to high temperatures for long periods of time, grain size grows and strength and other mechanical properties decrease, but the composite material of the present invention One of the major features of the composite material of the present invention is that no significant grain size growth occurs and therefore no deterioration in mechanical properties is observed.

In the composite material of the present invention, the particle interface between the nickel-chromium alloy, carbide, and silicide is formed by their fastening gradual phase.For example, Cr in the nickel-chromium alloy undergoes a catalytic reaction with the free carbon at high temperatures. As a result, Cr. The interface of the particles is formed from a fastened gradual phase in which the molar ratio with l5c gradually changes, and the carbide and silicide particles forming the gradual layer are 0.3
Since it is ultra-fine, less than p, an extremely strong connection is achieved.

Even if a conventional mixture of nickel-chromium alloy powder and SiC powder is hot-pressed or cold-pressed and then fired normally, the fastening force is extremely small compared to that of the composite material of the present invention because of the nickel-chromium alloy particles. This is thought to be because the fastening at the contact interface between the SiC particles and the SiC particles is not caused by ultrafine carbide or silicide particles as in the gradual layer of the composite material of the present invention, and the It has a new and unknown organization, and a strong conclusion has been achieved.

The composite material of the present invention has Ni-CrlO ~99.5%, chromium carbide 0.05~80%, and chromium silicide 0.05~99.5%.
20%, nickel carbide 0.01-40%, nickel silicide 0.01-10%, SiCO. It consists of a component composition of 1 to 30%.

The above component composition is the result of a quantitative method using X-ray powder diffraction using a standard substance, a scanning electron microscope using a standard substance, a spot line analysis using an X-ray microanalyzer, a fluorescence analysis, and a chemical analysis using a wet method. This is the value determined by Figure 1A is a micrograph of the composite material of the present invention using Ni-22%Cr nickel-chromium alloy powder as a base matrix, and Figure 1B is a thermal etching sample of a conventional material in which only the nickel-chromium powder is hot-pressed. This is a scanning-type secondary electron image microscope (magnification 150@), and it can be seen that A is finely and firmly fastened compared to B.

Here, in FIG. 1, Ni, . Carbides, silicides, etc. of Cr have a size of about 3 μm or less and are precipitated at the grain boundaries of the nickel-chromium alloy, so they are observed as black spots. Among the strengths of the composite material of the present invention, its transverse rupture strength is 110 to 170k9/TlTl
One major feature of the composite material of the present invention is that the tl compressive strength is 330 to 770 k9/i, which is much higher than the strength of conventional hot-pressed composite materials.

Further, the composite material of the present invention has carbides as its constituent components,
The micro-Vickers hardness of silicides, SiC, etc. is high at 1,500 or more, and since these are bonded extremely homogeneously, the micro-Vickers hardness as a whole is extremely high at 250 to 2,000. This is another characteristic of composite materials.

Table 1 shows the micro-Vickers hardness values of the conventional hot-breath fired body of Nj-30Cr powder and the composite material of the present invention obtained by adding 2% by weight of polycarbosilane to the powder, hot-breathing, and firing. show.

The reason why the composite material of the present invention has excellent mechanical properties is that, as can be seen from the X-ray microanalysis shown in Figures 1A and 2, the contact surfaces of nickel chromium, carbides, and silicides that make up this material This is due to the continuous interfacial change, that is, the formation of a gradual phase shift, which increases adhesion, continuously reduces and averages out the difference in thermal expansion coefficient, and is firmly connected. be. The composite material of the present invention is not only based on the fact that nickel chromium, which is the base matrix, has relatively high oxidation resistance, but also that carbides, silicides, etc. are thermally and chemically extremely stable compounds, and are also extremely tightly bonded. Another feature of the composite material of the present invention is that it has excellent oxidation resistance and corrosion resistance because it is bonded to

Next, the method for manufacturing the composite material of the present invention will be explained.

The nickel-chromium alloy powder that is the raw material for the composite material of the present invention is preferably fine particles, and those having a particle size of usually 350 mesh or less can be advantageously used.

Nickel chromium alloy powders of these particle sizes can be advantageously produced by a water atomization method. In addition, the composition of the nickel-chromium alloy is CrO. A nickel-chromium alloy consisting of 5 to 99.5% balance mainly Ni can be advantageously used. It is advantageous to vary the Cr content depending on the purpose and use of the composite material of the present invention. One of the raw materials used to manufacture the composite material of the present invention is an organosilicon polymer compound whose skeleton components are mainly carbon and silicon. Special Publication No. 57-53891, Special Publication No. 38534, Special Publication No. 53892, Japanese Patent Publication No. 51-149925, Japanese Patent Publication No. 51-149926
No., JP 57-53893, JP 51-Q476
No. 24, Special Publication No. 57-56566, Special Publication Shokan-385
No. 35, Japanese Patent Publication No. 57-53894, Japanese Patent Publication No. 52-59
724, Special Publication No. 59-33681, Special Publication No. 59-3
368? , Special Publication No. 1340, No. 1983, and Special Publication No. 52-
This is explained in detail in the specification of 7400 Gin, and the method for producing this compound will be described below. The organosilicon compound that can be used as a starting material for the compound is one or two or more selected from the following types (1) to [phase]. (1) Compound containing only Si-C bonds R4SilR3Si (R″SlR2)NR″S called SilahydrOcarbOn
This includes iR3 and its carbon monofunctional derivatives.

Examples (CH3)4Si, (CH2=CH)4Si, (CH
3) 3SiC=CSi(CH3)3, (CH2)5Si
(CH2)4, (C2H5)3SiCH2CH2C1,
(C6H5)3SiC02H1 (2) Compounds including Si--H bonds in addition to SiC bonds, such as mono-, di-, and triorganosilanes, belong to this category.

Example (C2H5)2SiH2(CH2)5S1H2(CH
3) 3SiCH2Si(CH3)2H,. C1CH2S
iH3, (3) is a compound organohalogensilane having a Si-Hal bond.

Example CH2=CHSiF,, C2H5SiHCl2, (C
H3)2 (ClCH2)SiSi(CH3)2CI
This includes compounds such as silylamine having a 1(C3H5)3SiBr1(4)Si-N bond.

Example (5) Si-0R organoalkoxy (or aloxysilane).

Example (CH3)2Si(0C2H5)2, C2H5SiC
l2(0C2H5), p-ClC6H4OSi(CH3
)3, (6) Compound organosilanol examples having Si-0H bond (C2H5)3S10H1(CH3)2S
i(0H)2, C6H5Si(0H)3, (HO)(C
H3)2SiCH2Si(CH3)2(0H), (7)
Example of compound containing Si-Si bond (CH3)3SiSi(CH3)2C11(CH3)
3SiSi(CH3)3, (C6H5)3SiSi(C
6H5)2Si(C6H5)2C1,8)Si-0-S
It is an organosiloxane compound containing an i bond.

Example (CH3)3S10Si(CH3)3, HO(CH3
)2Si0Si(CH3)20H,. C12 (CH3)
SiOSi(CH3)ClOSi(CH3)Cl2, [
(C6H5)2Si0]4, CH2=C(CH3)CO
2CH2Si・ (CH3)2CH202C(CH3)
=CH2 (9) Organosilicon compound ester An ester thought to be formed from nisilanol and an acid, including (C)2Si(0C0C1]G)2 and the like.

[Phase] Organosilicon compound peroxide (CH,)3S10
CC●(CH3)3, (CH3)3Sj00Si(CH
O) 3 etc.

In the molecular structure of (1) to al above, R is an alkyl group,
Indicates an aryl group.

In the present invention, an organosilicon polymer compound having silicon and carbon as main skeleton components, for example, a compound having the following molecular structure, is produced from the raw materials.

θ(d) A substance containing the skeleton components described in (a) to (c) above as at least one partial structure of a chain or three-dimensional structure, or a mixture of (a), (b) and (c).

Examples of compounds having the above molecular structure include the following. n=1, poly(silmethylene siloxane) n=
2, poly(silethylene siloxane) 9n=6, poly(
silphenylene siloxane) n=1, poly(methyleneoxysiloxane)' n=2, poly(ethyleneoxysiloxane) n=6, poly(phenyleneoxysiloxane)
n=12, poly(diphenyleneoxysiloxane) n
= 1, polysilmethylene n = 2, polysilethylene n = 3, polysiltrimethylene n = 6, polysilphenylene n = 12, polysildiphenylene (d) the skeleton described in (a) to (c) above Those containing the component as a partial structure of at least one of chain, cyclic, and three-dimensional structures, or a mixture of (a), (b), and (c).

Furthermore, examples of organosilicon polymer compounds containing different elements other than silicon, carbon, hydrogen, and oxygen that can be used in the present invention include the following (e) to (e). PolysilanePolysilthian(t)carborane-containing polymerOrganosilicon polymer compound 1 containing the above-mentioned different element can be synthesized by a known method.

In addition to the organosilicon compound containing a different element synthesized by the above-mentioned known method, there is also
It can also be manufactured by the manufacturing method described in the specification of -7400 inches. That is, the above (1) to (1)
At least one or more organometallic compounds selected from the organometallic compounds listed below (11) to (19) are added to the organosilicon compound of a, and 200 to 15% is added in a non-oxidizing atmosphere.
A diorganosilicon polymer compound containing different elements other than silicon, carbon, hydrogen, and oxygen can be synthesized by heating to a temperature range of 00°C. (11) Examples of organosilicon compounds containing nitrogen (C2H5)3SiNH2, (CH3)3
S1NHSi(CH3)3, (CH3)3S1(CN)
, (CH3)3SiNC0(CH3)3SINCS(1
2) Organometallic compounds containing Group 1 metals (coordination compounds)
Example CH3Li. ．． C2H5Na. ．． C6H5LiNN
a[(CH3)2Li. ．． KCH3, AgCH3, Au
C3Hg (13) Examples of organometallic compounds (coordination-containing compounds) containing Group H metals: BeC2H6, MgCH2, CaB2H
6, BaC2H6, Znc4HlOSCdC2H6, H
gCH3Br. ．． Sr-C2H6 (organometallic compound (coordination-containing compound) containing Group 10 metal) Example BCH5O2, B
C3H9, AlC2H7, GaCH3O, InC2H8
NInC3Y! , TlC3H9, Sc(15) Organometallic compound (coordination-containing compound) containing Group II metal Example HfCl
OHlOCl2, GaC2H8, SrlC2H8, Pb
C2H8, (16) Organometallic compound containing Group II metal (
Coordination-containing compounds) Examples VC6O6, NbC6O6, Tac6
O6, C4H4N, PC2H5O5, PC2H,, AS
CH3S,,ASC2H7,SbC2H7,BiC3H
9(17) Examples of organometallic compounds (coordination-containing compounds) containing Group Ⅰ metals WC8H6O3, C2H5SH, . SeCH2
, TeC2H6, POC2H6 (18) Examples of organometallic compounds (coordination-containing compounds) containing Group Ⅰ metals Mncl.

HlO. ．． TCClOHlO,, ReC6H9O. (1
9) Organometallic compounds containing Group ■ metals (coordination-containing compounds)
Example FeClOHlO. ．． COC6H, O3, NjC6
Hl.

, RUClOHlORhC9Hl3, PdC8HlOP
dC5H5Cl, 0sc10H10SIrc303, P
tc4H,2 The above (a) to (a) synthesized in this way
The organosilicon polymer compound shown in d) whose main skeleton components are mainly silicon and carbon, and the above-mentioned (e) to (iv)
and at least one kind selected from organosilicon polymer compounds containing different elements other than silicon, carbon, hydrogen, and oxygen, which are made from two or more kinds of compounds shown in (1) to (19). Organosilicon polymer compounds can be used as raw materials for the composite material of the present invention. The organosilicon polymer compound described above, which has carbon and silicon as its main skeleton components and optionally contains metal elements in its skeleton, can be obtained as a solid or viscous liquid at room temperature by a relatively simple and inexpensive manufacturing method. Therefore, in the present invention, these 15 solids or viscous liquids can be used as they are.

That is, this becomes a liquid with low viscosity by heating at a relatively low temperature of around 300°C, so at the initial stage when the green compact formed by adding and mixing Ni-Cr alloy powder is heated and fired, Once it becomes a low viscosity fluid, it completely covers the base Ni-Cr alloy powder and facilitates the necessary reactions and diffusion that occur during the subsequent heating process to high temperatures, resulting in a strong bond. The effect of producing a fired molded body is extremely large. The chemical changes that occur during the heating process in the compacted body made of the above-mentioned starting materials will be explained below.

As described above, the organosilicon polymer compound becomes a low viscosity fluid at the initial stage of heating and uniformly and generally covers the metal powder.
When the heating temperature further increases, the organosilicon polymer compound thermally decomposes, some organic substances containing carbon, hydrogen, and silicon are volatilized as volatile components, and the remaining highly active carbon and silicon are converted into Ni-Cr from about 700℃. started to react, 10-10
Carbides and silicides with a diameter of 0A begin to form. Note 14
If heated to a temperature higher than 00°C, the Ni-Cr alloy will soften or melt and the carbides and silicides formed during sawing will decompose, so it is necessary to heat within the temperature range of 700 to 1400°C.

Here, if the initial amount of the organosilicon polymer compound is large, a SlC phase is further generated in the composite material. The morphology of the SiC phase is approximately 1000°C when heated from 700 to 1400°C.
Below, it becomes amorphous, and above 1000°C, it becomes a β-type crystal phase. Finally, the Ni-Cr-based alloy, Ni and Cr carbides, silicides, and SjC phase are uniformly dispersed among each other! They are firmly connected to each other to form a composite material. In the present invention, 99 to 3 mass% of NI-Cr alloy and 1 to 7 mass% of organosilicon polymer compound are mixed.

C The amount of this organosilicon polymer compound can be changed depending on the firing method, but if it is less than 1%, the addition effect is poor and it is difficult to obtain a molded product with strong bonding and high strength, and if it is more than 70%, the Ni-C base
Most of the r-alloy is converted to carbides and silicides, and N
Since the high temperature toughness and other advantageous properties inherent to i-Cr alloy 4 are impaired, it is necessary to add it within the range of 1 to 7% by weight. The reason for setting the amount of Ni-Cr alloy powder to 30 to 99% by weight is that if it is less than 3% by weight, carbides and silicon
The amount of 16 compounds is large and the toughness is poor, while 9
If it exceeds the heel weight%, the strong bonding and high strength properties will be impaired, so 30
It is necessary to keep the heel weight within the range of ~9%.

Note that the organosilicon polymer compound is thermally decomposed during the firing process, and a part of it is volatilized in the form of hydrocarbons, hydrogen, etc., and about 60% by weight of the added amount remains and participates in the reaction. The above blending amount can be set depending on the purpose of use of the composite material, but if you want to add more toughness, use a large amount of metal powder, and if high strength or hardness is required, use metal powder. It is preferred that the amount be relatively small.

However, when using the organosilicon polymer compound containing the metal element described above, good results can be obtained even if the amount of metal powder added is 5% or less. Also, if necessary, yρ or Mg
Customary calcination accelerators such as O--SiO2 can be added.

Next, the Ni--Cr and organosilicon polymer compounds described above are mixed to form a mixture. Two methods can be used for the mixing method: dry mixing and wet mixing, and the dry mixing method is to mix the metal powder and the solid powder of the organosilicon polymer compound using a ball mill, mortar, mixer, rotating drum, etc. It is mixed using a mixer. In addition, wet mixing is performed by heating and melting the organosilicon polymer compound to form a solution, or by using solvents that can dissolve the organosilicon polymer compound, such as benzene, toluene, xylene, ethylbenzene, styrene, cumene, pentane, and hexane. , octane, cyclopentadiene, cyclohexane, cyclohexene, methylene chloride, chloroform, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, methylchloroform, 1,1,2-trichloroethane, hexachloroethane, chlorobenzene, dichlorobenzene, As a solution in ethyl ether, dioxane, tetrahydrofuran, methyl acetate, ethyl acetate, acetonitrile, carbon disulfide, etc., metal powder is added to the solution and a mixer (e.g., ball mill, mixer, rotating drum, mortar) is used. Mix. The mixing is preferably carried out so that the powder and the organosilicon polymer compound are mixed sufficiently and uniformly. Next, the methods of pressurization and sintering can be roughly divided into: - Mixed powder grains of the starting raw material are pressed to a powder density of 100 to 8000k9/Cri by a powder compaction method such as mold pressing, hydrostatic pressing, or extrusion. A sintering method after compaction involves applying pressure to form a predetermined shape and then sintering it by a heating method using, for example, a resistance heating furnace or a high-frequency furnace; Put the mixed powder grains into a suitable mold and
It is possible to use a hot press method in which powder compaction and sintering are simultaneously performed while applying powder pressure of 0 to 8000 k9/Clt.

The hot pressing method is advantageous in order to obtain a material with higher performance, but depending on the properties required of the cermet, a sintering method after compaction may also be sufficient to achieve the objective. As the atmosphere for the above-mentioned sintering, an atmosphere consisting of at least one type suitably selected from among N2 gas, inert gas, NH3 gas, CO gas, hydrogen gas, and organic compound gas is used.

It is necessary to select and set the above-mentioned firing conditions such that the base metal powder and the organosilicon polymer compound are not adversely altered. N used in the present invention
The i-Cr alloy includes the alloy systems shown in Table 2, and also includes cases where small amounts of various elements are added thereto. Next, the present invention will be explained with reference to examples.

Example 1 Ni-Cr based alloy powder (made by water spray) consisting of 78% Ni and 22% Cr with a 350 mesh under-product and an average molecular weight of 1
Weigh out 500 polycarbosilane in a weight ratio of 9:1,
Normal hexane was added to this and the mixture was thoroughly kneaded and then dried in dry air.

After the above treatment, the powder is hot-breathed to make it oxidation resistant.
A molded article with excellent corrosion resistance was obtained. A hot-breathing jig was made of carbon, and hot-breathing was performed at a pressure of 200 k9/d under an argon flow. The heating method is high-frequency induction heating, and the temperature increase rate is 300℃/Hr and the maximum temperature is 1000℃.
'C'C'0. After holding for a certain period of time, the pressure was released, the high frequency power was turned off, and the mixture was allowed to cool. The results of comparing the case where only Ni-Cr alloy was hot-pressed and the case where 1% polycarbosilane was added and then hot-breathed showed that polycarbosilane greatly contributed to improving oxidation resistance and acid resistance. It turned out that.

Figure 3 shows 78Ni-22Cr alloy and 78Ni-22C
FIG. 3 is a diagram showing the results of oxidation weight gain when two samples of r alloy to which 1UI% polycarbosilane was added were heated at 10,000 C in air.

As can be seen from the figure, the value of oxidation weight gain itself is small in hot-breathed products to which polycarbosilane is added. In addition, the oxidation weight gain curve follows a parabola as shown in Figure 3B in the case of a hot-pressed product without the addition of polycarbosilane, but in the case of a hot-pressed product with addition of polycarbosilane, it slightly increases at the initial stage of oxidation as shown in Figure 3A. It is parabolic, and after this it becomes almost horizontal. The most remarkable fact is that severe spalling was observed when polycarbosilane was not added, but when polycarbosilane was added, the oxide was in close contact with the base metal and no spalling was observed. As described above, polycarbosilane-added products are much superior to additive-free products in terms of high-temperature properties such as oxidation resistance and spalling resistance.

In addition, when we compared the chemical resistance to boiling concentrated nitric acid, we found that the amount of polycarbosilane-free products dissolved in the same amount of time was twice that of polycarbosilane-added products. The effect of adding carbosilane was observed.

Example 2 70Ni-30Cr alloy powder (under 350 mesh product) and polycarbosilane with an average molecular weight of 1700 in a ratio of 8:2
Normal hexane was added thereto, the mixture was thoroughly mixed and kneaded, and then dried in dry air.

After the above treatment, the powder was heated at 50°C/H in an argon stream.
Temperature was raised to 500° C. at a heating rate of r to perform temporary firing.
After sieving the powder thus obtained through a 100-mesh screen, 2 tons
Cold-pressed at 0n/Clt. This press molded body was heated to 1250°C at a heating rate of 100°C/Hr in an argon stream.
The temperature was raised to 1, maintained for 1 hour, and then cooled. The fired body thus obtained has excellent hardness and wear resistance. As already mentioned in Table 1, the Vickers hardness value of the Ni-30%Cr fired body is 150, but the Ni-30%
The micro-Vickers hardness value of the Cr+2% polycarbosilane fired body is as high as 1400. Furthermore, the wear resistance value was twice as high in the case of the product containing polycarbosilane as compared to the product without the addition of polycarbosilane.

Example 3 350 mesh under Ni-Cr alloy (Ni8l%,
Crl 9%) and polycarbosilane with an average molecular weight of 1500 were weighed in a weight ratio of 9:1, normal hexane was added thereto, the mixture was thoroughly kneaded, and then dried in dry air.

After the above treatment, the powder was heated at 50°C/H in an argon stream.
Temperature was raised to 500° C. at a heating rate of r to perform temporary firing.
After sieving the powder thus obtained through a 100-mesh screen, 2 tons
Cold-pressed at 0n/C7lf. This breath molded body was heated to 1250°C at a heating rate of 100°C/Hr in an argon stream.
The temperature was raised to 1, maintained for 1 hour, and then cooled. The thus obtained fired body has excellent hardness and wear resistance, but particularly has a high transverse flexural strength of 165k9/Trrlt. As described above, the present invention provides a composite material with excellent corrosion resistance, oxidation resistance, high hardness, strength, and especially toughness, and a method for manufacturing the same. Tools, die materials, various nozzles, engine parts, turbine blades, wear-resistant parts, heating element materials, heat-resistant materials, other mechanical parts, crucible materials, high-temperature structural materials, durable materials, heat resistance, high-temperature strength,
It is believed that it can exhibit sufficiently excellent performance in various fields where high-temperature oxidation resistance, corrosion resistance, and thermal shock resistance are required.

[Brief explanation of the drawing]

Figure 1A is an electron micrograph of a composite material of the present invention using a nickel-chromium alloy powder consisting of Ni-22%Cr as a base matrix, and Figure 1B is a conventional example in which the nickel-chromium alloy powder of A is hot-pressed. An electron micrograph of the material, Figure 2 is a diagram showing the relationship between distance and relative intensity by X-ray microanalysis of the composite material of the present invention, and Figure 3 is an electron micrograph of the composite material of the present invention when heated in air at 1000 ° C. It is a figure showing the relationship between time and oxidation weight gain.

Claims (1)

[Claims] 1. Nickel chromium alloy 10-99.5%, chromium carbide 0.05-80%, chromium silicide 0.05-20%
, nickel carbide 0.01-40%, nickel silicide 0.01-10%, SiC 0.01-30%, with Ni, Cr between the nickel chromium alloy powder particles.
, at least one carbide selected from Si, and at least one carbide selected from Ni and Cr.
A nickel-chromium alloy composite material having a structure in which seed silicides exist, the nickel-chromium alloy, carbide,
The silicide is uniformly dispersed, the interface of the dispersed particles is formed from the fastening gradual phase of the nickel chromium alloy, the carbide, and the silicide, and the size of the carbide and silicide is 0.3.
A nickel-chromium alloy composite material with a microstructure of less than μ and excellent heat resistance, corrosion resistance, oxidation resistance, wear resistance, hardness, and strength. 2 Organosilicon polymer compound 1 whose main skeleton components are nickel chromium alloy powder 30 to 99% by weight and carbon and silicon
Pressure molding the mixture with ~70% by weight and in vacuum,
N_2 gas, inert gas, CO gas, CO_2 gas, N
700-1400℃ in an atmosphere consisting of at least one selected from H_3 gas and hydrogen gas
Nickel chromium alloy 10-9
9.5%, chromium carbide 0.05-80%, chromium silicide 0.05-20%, nickel carbide 0.01-40
%, nickel silicide 0.01-10%, SiC0.0
At least one carbide selected from Ni, Cr, and Si and at least one silicon selected from Ni and Cr are present between the nickel-chromium alloy powder particles. A nickel-chromium alloy composite material having a structure in which nickel-chromium alloys, carbides, and silicides are present, wherein the nickel-chromium alloy, carbides, and silicides are uniformly dispersed, and the interface of the dispersed particles has a gradual phase shift between the nickel-chromium alloys, carbides, and silicides. and a process of obtaining a nickel-chromium composite material having a structure in which the carbides and silicides have a size of 0.3μ or less. , a method for producing a nickel-chromium alloy composite material with excellent hardness and strength.