JPS60103078A - Electroconductive zirconia base sintering material and manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention is a conductive zirconia-based sintered material that has high toughness and hardness, has excellent corrosion and wear resistance, and can be used for a variety of purposes by imparting conductivity to zirconia, which is originally an insulating material at room temperature. The arrangement of the binding materials is what concerns the manufacturing method.

In recent years, zirconia (hereinafter referred to as zr02)-based materials have become known as Y2.
Since the Zr0z sintered material partially stabilized by O3 was released, attempts have been made to use it in structural members that require high strength, tool materials such as cutting tools, and other materials.

However, these stabilized Zr02 (the same applies hereinafter, including partial weakening) have high strength, but hardness is at most HRA.
It is about 90, which is inferior to A/-, 0, type materials, so when used as a cutting tool material, it often cannot be used for cutting tools due to its wear resistance. Furthermore, stabilized ZrO2 has low thermal conductivity and high coefficient of thermal expansion, which are advantages depending on the application, but have insufficient characteristics in terms of heat resistance Blj IN. The annealed ZrO sintered body is a white material and has the disadvantage that it cannot be used as a material for decorative parts.

Furthermore, stabilized ZrO□ is used as a heater material in the 1III temperature range, but in the low temperature range the specific resistance value is very large and it is less than the insulating material, so it has the disadvantage that it cannot be used as a self-heating element. , Stabilized Z r02 has inferior grindability compared to other ceramic materials, and when drilling holes or processing into complex shapes, it is an insulating material, so it is not possible to use the electrical discharge machining method, which has high machining efficiency. The drawback was that it had to rely on bulk ultrasonic processing.

In order to eliminate the drawbacks of stabilized ZrO2 mentioned above, the material of the present invention has high toughness and hardness, excellent corrosion resistance, wear resistance, and heat and shock resistance by adding a carbide component and imparting conductivity. The Zr02-based sintering material has also been improved, making it possible to adopt electrical discharge machining when processing it into self-heating heater materials and various other products, resulting in a material that can significantly reduce processing costs. The features constituting the present invention will be described in detail below.

First, materials for watch sides, bracelets, tie pins, cufflinks, pendants, and other various decorative parts need to maintain a glossy surface with a beautiful appearance for a long period of time. It is required to have high breakage resistance, and the product manufacturing process is 1! I! In terms of high efficiency machining, it is required to have grinding workability in the process and electric discharge machinability for complex shapes or drilling in one step.

Furthermore, each one of these! I (Decorative members) It is natural that the most important characteristic required for product reliability is that it has sufficient impact resistance to prevent damage to expensive products, and other Attire 11 part 4QJ] 11
It is also required as a desirable characteristic that it is not excessively large when used as an ornament.

Conventionally, carbide tool materials, cermet materials, stellite, etc. have been used as materials for decorative members that require the above characteristics, but although they have excellent strength, many of them are heavy. In addition, since all of the materials contain metal components, they exhibit a metallic luster, and it has been impossible to perform fLI on black materials.

On the other hand, various ceramics and phosphorus materials that do not contain gold are being used as colored decorative shrines with beautiful colors, but since these types of materials do not have electrical conductivity, they cannot be used when making complex shapes or holes. In addition to requiring a large number of processing steps, it also had the disadvantage of poor breakage resistance due to its generally low strength.

In addition, as a strong ceramic material, Y, 0. ZrO2 stabilized (including partial stabilization) by et al. has been reported, but its grindability is very rapid and the material is white, so it has little utility as a decorative member.

Secondly, metal-based materials are generally mainly used as resistance heating elements (heater materials), and ceramic resistance heating elements include those with conductive heating paths bonded to insulating ceramic materials, or those with heating elements embedded. In addition, SiC-based heating elements and ZrO-based heating elements are used for high temperature applications.

Among the various heating elements mentioned above, metal materials are inferior in corrosion resistance, oxidation resistance, and wear resistance, so they tend to be immersed in oxidizing atmospheres, acids, alkaline substances, salt, etc., and their hardness decreases. Because of the low friction, a heating element used under friction condition 1 would be within the range of shortening its life due to wear, and SiC heating elements have low strength, which may cause breakage, and the crystal grains are coarse and the structure is low. Because it is not dense, when used under friction conditions, a flat 71° i ff surface cannot be obtained, resulting in drawbacks such as particle shedding and wear, and damage to the mating material. Mata Z
The r02 thread resistance resistor has almost di conductivity in the low R1 range.
However, it had the disadvantage that it could not be used as a heat generating element unless it was preheated to a high temperature of t-48 with another heater.

Thirdly, cutting tools, cold and heat 1 ``i'' Machining die tools, molds, belt cleaners, and other wear resistant]: JI, etc. tool materials are uniformly fine and Fji'! It must have high hardness and wear resistance, and high strength so that it will not chip or break, and it must also have excellent heat resistance when used under GeJ thermal quenching conditions. Materials that also have these characteristics are long-life and reliable tool materials.

Carbide tool materials and cermet materials are widely used as these tool materials, but these materials have W as their main component.
Because it is a carbide such as C or TiC and contains metal components, it has the disadvantage of having a strong affinity with iron sword materials or non-ferrous metal workpieces, and may also have inferior wear resistance. As a solution to this problem, ceramic tool materials are being effectively used, and demand is steadily increasing.

Characteristics of the material of the present invention include:
Stabilized Z r02 which is originally a white material and an insulating material
By adding an appropriate amount of carbide to the material, it is necessary to make the material dark brown or yellowish, tough, and wear-resistant, as well as imparting electrical conductivity. This makes it possible to adopt electrical discharge machining, which has much higher machining efficiency than ultrasonic machining, and also makes it possible to use materials that have improved the above-mentioned drawbacks in terms of heater materials, that is, they have excellent corrosion and wear resistance, are strong, and It has excellent heat resistance and impact resistance of 8J, and the constituent crystal grains are fine and smooth, making it a material that can self-heat even in low temperature ranges.When processing the material, it has a special shape such as drilling a heater terminal mounting hole. It is possible to adopt the highly efficient electric discharge machining method for machining, and M, 0. Tougher and more impact resistant than other ZrO2-based ceramic materials than conventional stabilized ZrO2
Improves wear resistance and reduces f-radiation during material processing.
It has material properties that can significantly reduce processing costs by making it possible to employ the lf processing method or the electrolytic fi + method.

The demand for ceramic and lithium-based materials is increasing for the various uses mentioned above, and in particular, ceramics such as Al, which has high hardness and wear resistance, 0° or stabilized toughness Zr02, and lithium-phase T-1. Due to its great hardness, grinding using a diamond whetstone is the mainstream. There are certain limits when performing IC external forming, internal diameter machining, drilling, etc., and there are many cases where electric discharge machining or ultrasonic machining has to be used, so electric discharge machining is adopted. However, the machining of complex and special-shaped objects such as those mentioned above had no choice but to rely on ultrasonic machining methods. However, since the processing efficiency is very poor, the product is necessarily expensive, and it may not be possible to meet the cost for immediate production.

On the other hand, the electrical discharge machining method is generally used for carbide tool materials, etc., and has a machining efficiency several times higher than that of the ultrasonic machining method, and is a better machining method in terms of machining costs. , it is an essential condition that the workpiece has electrical conductivity.

In view of the above-mentioned current situation, the present invention aims to provide a conductive zirconia-based sintered material and a manufacturing method for ζ, which imparts conductivity to zirconia ceramics and makes it possible to employ electrical discharge machining. is a conductive zirconia-based sintered material and a method for producing the same as described in the claims.

Although the partially stabilized ZrO powder differs depending on its manufacturing method, it contains 0.05% of Al2O3 as an impurity, +'
+: 96 q: 1 degree is usually used for PJ, but if alumina balls are used in the grinding process, At20. is 1 ij
It is customary for this person to do this.

In the present invention, it is made cheaper (all and 1111 minutes stabilized) 1r
The working force J effect when replacing part of o2 with A403 is 6
'lj Mj l.

As a result, as will be described in detail later, 1C exchange J by
It was found that when +t is less than 2%, there is almost no λ-ton degree in IY property 1rO, so 21(
Some small companies use Jb with 1% or more of Ji replaced with A-120s.

The experiments and examples that led to the development of the present invention and their results will be shown below.

Experiment 1> Each sample listed in Table 1 has been stabilized (including partial stabilization) with impurities other than Y2O as a stabilizer of 0.1% or less and has an average particle size of 0.3 μm. TiC and WC powders with a purity of 99% and an average particle size of 11TrL are each weighed to 25% by volume to the extracted ZrO powder, mixed and ground in a wet ball mill, and then a molding binder is added as necessary. A raw material for sintering was obtained by drying and sizing.

The above raw material for sintering is processed by a mold press molding machine at 50 CkVW.
After molding at the above pressure, non-oxidizing atmosphere (Ar gas)
Maintained in a furnace at a temperature of 1300-1650°C for 1 hour,
A preliminary sintered body having a relative density of 94.5 to 98% was obtained.

Since the optimal sintering temperature differs for each sample point, the pre-sintered bodies were obtained under temperature conditions that gave a relative density of 94.5 to 98% for each sample.

Next, the pre-fired crystal is heated with an inert gas (Ar) using a HIP device.
A sintered material was obtained by holding the pressure at 1500 atm and the temperature at 150° C. lower than the preliminary sintering temperature at each sample point for 1 hour.

As a sample for investigating the characteristics of the sintered body, a 5×5×25 specimen was ground using a diamond grinding wheel, and the various data shown in Table 1 were obtained. - Regarding the porosity, data was obtained by finishing each sample with a Q-bend and then analyzing everything from minute spots to large spots using an image analyzer.

Table 1 Yes.

<Experiment 2> S) The same Zr02 powder as used in sample 3 of Ikiishi Ai, various carbide powders with a purity of 99% or more and an average particle size of 0.8 to 1.0 μm were used. The raw materials for sintering, the preliminary sintered body, and the HIP sintered material were weighed so that the volume percentages listed in Table 2 were obtained, and the various characteristic values listed in Table 2 were obtained in the same manner as in Experiment 1. Obtained.

The HIP conditions in this experiment were 10% lower than the pre-sintering temperature.
The inert gas (Ar) pressure was set to 1300 atm and maintained at a temperature of 0° C. for 1 hour.

Also, the pressure is 50kg/cmL or more, the temperature is 1300~1
We also investigated the materials that were R4IQed using the hot press method (hereinafter referred to hereinafter) for all test specimens listed in Table 2 under suitable conditions for obtaining G2 densely fired TFJ bodies in the range of 650°C, and the results are shown in Table 2. Almost the same characteristics were obtained.

The same ZrO powder as used in Sample A3 of Experiment 1, A carbide powder with a purity of 99% or more and an average particle size of 0.8 to 1.0 μm was added to the capacity X r- as shown in Table 3. A new scale was used, and a raw material for sintering, a pre-sintered material, and a HIPi material were obtained in the same manner as in Experiment 1, and the properties listed in Table 4 were obtained in the same manner.

The H-process P conditions in this experiment were a temperature 50°C lower than the optimum pre-sintering temperature, and an inert gas pressure (Ar) of 10
The pressure was set at 00 atm and maintained for 1 hour.

The same Zr02 powder as that in Sample 3 of Experiment 1 with a purity of 99% or more and an average particle size of 0.8 to 1.07 + m
Weighed 5 tons of various composite carbide powders (5 tons) and prepared them as raw materials for sintering, pre-11 sintering materials, and HIP sintering materials using the method similar to Experiment 1 and 111J. was obtained, and the M characteristics listed in Table 5 were obtained using the same method.

6 The HIP conditions in this experiment were a temperature of 1200°C.
The inert gas pressure (Ar) was 1800 atm and CI for 1 hour.
'', held.

Table 5 Note) A=WC:TiC=50:50 Purity=99% Average particle size=1. OpenB=WC: TiC:TaC=
50:30:20 Purity = 99X average particle? &=1. O1
1mC=WC:NbC=30Nia0 Purity=99X Average particle diameter=1.2μm (same below) Zr02 used contains 3 mol% Y2O3 (Experiment 5) Total m+H or partially stabilized Z ro, to h
In order to investigate the effects of adding t2o3, Table 6 shows Table 6 [Example 1] As a representative example of the material for decorative members, the A of the actual Ml on the side 1 was used.
2.4.7.9, Experiment 2 A2.3.4.5.9.14
．． 20.26.31.35, Experiment 3 cliff 2.5.6.1
2.15 and black 2.5.9.16 from Experiment 4, the inner side and stepped part were finished and machined after electrical discharge machining, and the outer surface was finished with a grinding lap. Sa1
．． As a result of a repeated drop test on a wooden floor from a position of 5m,
Izuri, mo I & the appearance of the rap song is (J
Except for the color of K31, which was close to golden yellow, a blackish-brown color with a uniform and beautiful glossy surface was obtained.

[Example 2] A 10X1.5X100 ceramic heater was made of the same material corresponding to the sample JFL shown in Example 1 above.
After making 5 heaters in the longitudinal direction and connecting them in series through electrical discharge holes, the temperature was raised with a voltage of 10 volts, and the temperature reached 400℃ within 5 minutes. , the body temperature is the same, and instead of using a heating furnace for thermosetting adhesives, the rock object to be attached is placed directly on the heater and heated, resulting in an energy consumption rate of about 1096 tons compared to the indirect heating method using an electric furnace. The small size that can save this money is size IIIJ.

[Example 3] The various l18 bodies confirmed by the above-mentioned experiments 1 to 4 were ground into a cutting tool shape of 5PGN432, and the cutting conditions were a cutting speed of 450v, a feed rate of 0.2, and a depth of cut of 0.5g/rev.
As a result of turning a 10% Si-containing At alloy for 10 minutes, the conventional 39Y20. Partially stabilized ZrO2 has a flank rib 11 of 0.25 sm, whereas all outside the scope of the present invention are 0.1 to 0.15+n+n, which is the same as that of the superhard alloy KIO. However, the shape of the turned surface 11
Whereas KIO's W surface was only wrinkled due to welding, all surfaces formed by the products of the present invention were glossy and exhibited excellent performance.

It should be noted that products outside the scope of the present invention often caused troubles such as abnormal wear or chipping, and exhibited unsatisfactory performance.

[Example 4] As an example of tool material, extrusion mold (nozzle)
was made with the composition of Sample No. 14 in the above experiment, the outer circumferential part was ground and finished, the inner diameter part was ground and lapped after electrical discharge machining, the bearing part was made into a $1,501 vice, and it was installed in an extrusion molding machine. As a result of the test, the conventionally used hardened steel nozzle was made by mixing and kneading At, O, and 10% polyvinyl alcohol at a molding pressure of 80ki7.
The diameter of the bearing after extrusion molding is $1.6
However, under the same conditions, the product of the present invention had a wear resistance of 1,504 mm, and an extrusion mold with extremely excellent wear resistance was obtained.

[Example 5] 10 and 99X At2 in cemented carbide for wear-resistant materials
0s and 48 of Experiment 2 of the present invention, 57 of Experiment 3, Experiment 4
As a result of making a belt cleaner for iron ore belt conveyor at Cliff 8 and subjecting it to a practical test, the product of the present invention was 5 times that of KIO and 99% A40. "It shows a lifespan of 3 mm, indicating that the wear resistance of non-claws is improved by 2 mm."

[Example 6] As a result of making a wire drawing die with a die diameter of 2.6 from the material according to A3.420 of Experiment 2 and putting it into practical use, it was found that the wire-drawing die G1 had a wire drawing capacity of j+k 20 tons. In contrast, the product of the present invention has a long service life of 32 tons for En3 and 30 tons for A20, and the surface luster of the wire is very beautiful due to the unexploded 111J product, compared to that of the conventional cemented carbide G. The product value has been significantly increased compared to wire rods.

Also, l1ii diameter 1 inch wall thickness 2 by the same trial iA as above
The conventional jJ'16 dies for the split hook vibe processing are also used.
It was found that the lifespan was 1.3 times longer than that of i4 quality alloy.

The experimental results and results shown above! With reference to Example 1, the composition and various aspects of the conductive zirconia-based sintered material of the present invention will be explained. ? The characteristics and the manufacturing method conditions for obtaining them will be discussed below.

In recent years, there are many documents related to partially stabilized ZrO□ (, MgO, Y
,0. The high strength properties of the ZrO□ sintered body stabilized with , it is difficult to obtain a material with strong strength because fine cracks, cracks, etc. are likely to occur, and conversely, if it exceeds 5 mol%, the effect of obtaining strength due to crystal phase transition is small, resulting in unsatisfactory results in terms of breakage resistance. It turned out that.

Regarding the crystal grain size of this material, the average grain size is 2.
If the thickness exceeds 5 μm, even if the material has relatively high strength, the monoclinic phase may naturally increase over a long period of time under usage conditions where it is subjected to heating and cooling cycles from room temperature to several hundred degrees Celsius, and the strength will deteriorate. Natural deterioration may occur. Special? To prevent this natural deterioration phenomenon, the Zr02 crystal particle size should be reduced to 1 μm.
In addition to suppressing the average crystal grain size of the material to 2.
This is achieved by suppressing the thickness to 5 μm or less, preferably 2.0 μm or less.

Furthermore, if the strength exceeds 2.5 ltm, the strength of the products of the present invention generally tends to decrease.11 The thread used in the tool material, which is subject to mechanical damage, may be cracked, chipped, or damaged. In addition, the larger the crystal grain size, the more spots tend to increase, and the hardness also tends to decrease. In addition, in the case of die tools, etc., welding or wear progresses starting from the spot.

If the porosity of the sintered material exceeds 1%, there will be many disadvantages such as wear due to low strength and failure to obtain a beautiful lapped surface due to spots, resulting in poor kr-1.

In particular, mold materials and the like are often subjected to mechanical magic impact forces, so it is natural that materials with lower strength are more likely to break.

The inventors have found that the Charpy value has a higher correlation with the breakage resistance in the above phenomenon than the bending strength normally used for ceramic materials, and that the Charpy value is 0.1 kgfml- It has been found that if it is less than 20%, there is a possibility that materials for decorative members, cutting tool materials, die tools for cold and hot working, etc. will be damaged.

This breakage resistance was confirmed by a drop test of materials for decorative parts.
This is the conclusion obtained from the results of step a, and the falling distance was set in the range of 2 m at the maximum from the height that humans can handle, that is, 1 rrL.

Next, if we consider the electrical conductivity of the material by 1 and consider the specific resistance value, the lower the specific resistance value, the easier the electrical discharge machinability will be. There is inevitably a limit, and when the carbide component is 40% by volume, it corresponds to 0.5 mΩ@σ.

Even when 40% of Naori-byde ingredients are combined, it is 8!
i! Depending on the manufacturing method, it is possible to obtain a material of 0.5WLQIIcnT or less, but 4. The material obtained from ++ is a ZrO2 axe.

This is a phenomenon that is observed in test pieces where the crystal grains are coarsened, and as the strength and frequency decrease, damage and wear become rapidly difficult to deal with, making it impossible to process into special shapes.

Furthermore, as is clear from Experiment 5 and the '86 table showing the results, Z rO2 2 jit ++ partially or entirely stabilized with at least one of Y2O3 and Δ4gO.
Even if you exchange 15 Zai 1 with M2O3, the shrine will also be 1 q
) The propensity was found to be small with almost no change.

Next, considering the conditions of the manufacturing method, if the pressurizing force during HP is less than 501 V'm, products with insufficient density due to insufficient pressurizing force will be produced more frequently. In this case, the lapping surface becomes cloudy or has a pear field shape, and defective products such as spots are likely to occur, and the tool material becomes a cause of a decrease in outward direction.

It goes without saying that the upper limit of the pressing force depends on the strength of the material t used for the IP type, such as graphite. Further, if the sintering temperature is less than 1300° C., it is difficult to obtain a dense sintered body, and it is not economical because it requires holding for a long time to achieve dense sintering.

On the other hand, if the sintering temperature exceeds 1650°C, reaction adhesion with the mold will occur, which will likely result in cracked and defective products, as well as making it impossible to obtain a material with uniform and fine grain size, resulting in a decrease in strength. In this case, it becomes difficult to obtain a beautiful luster in the appearance of the material for decorative members and the appearance of the product processed with the die tool.

Next, the relative density of the preliminary sintered body to be subjected to HIP is 94.5.
If it is less than 56, there may be local density unevenness in the pre-sintered body, and even if the HIP treatment is performed, a locally insufficient density product will be obtained, and it is necessary to obtain a homogeneous material. Must have a relative density of at least 94.5%.

In addition, if the holding pressure during HI'P is less than 500 atm, products with insufficient density due to insufficient pressure will be produced more frequently.
The wrapping 161 is cloudy, looks like a pear field, or has spots, resulting in defective products, making it unsatisfactory as a material for decorative parts. Become.

If the temperature during HIP is less than 1200° C., the HIP effect, that is, densification, will be insufficient due to insufficient warming.

On the other hand, if the temperature exceeds 1650°C, the crystal grain size increases due to oversintering, making it impossible to form a high-strength product.

As described in detail above, the material of the present invention has rr+6'
Due to its high strength and toughness, it can be used for long periods of time to protect the surface of decorative parts and the surface of the workpiece.
+ Durable, and not damaged or missing.
It has a fine 7+1 weave and can produce blackish-brown and golden tones, so when applied to various ornaments, it can be used alone or with other tones. In addition to having a great aesthetic effect when used in combination with other materials,
It has a very long life as a heater material, wear-resistant and corrosion-resistant material, and tool material, and it also has great economical effects because it enables highly efficient electrical discharge machining and electrolytic grinding.

In particular, the skewer that regulates the blended TiC and other carbides and their blending amount as described above gives conductivity (=J), making it possible to perform electrical discharge machining, and to perform '61Rst shaped products and drilling. It has an energy-saving effect as a heating material for various decorative items, and has higher hardness than the conventional partially stabilized Zr02.
Excellent as a sintered material that extends the life of tool materials.

Patent applicant: Nippon Tungsten Co., Ltd. Continued from page 1 0 shots Akira Toyoshige Sasaki Kiyoshi, Minami-ku, Fukuoka City; In-house 0 shots Akira Koga Shizuki Kiyoshi, Minami-ku, Fukuoka City; In-house 0 shots Akira Yasumi Takano Kiyoshi, Minami-ku, Fukuoka City; In-house 0 shots by Shigeru Mori, Kiyoshi company, Minami-ku, Fukuoka city

Claims (1)

[Claims] L Tic, NbC, Tic, Cr, C,, Z
The carbide component consisting of at least lNi among rC, Mo2C, and WC accounts for 17.5 to 40.0% by volume, and the remainder consists of a ZrO2 component stabilized with 2 to 5 mol% of Y2O and/or MgO. , and its specific resistance value is (0,
5-60) A conductive zirconia-based sintered material characterized by being XIO'''Ω-α. 2 Characterized by having an average particle diameter of 2.5 filn or less and a porosity of 1 volume % or less The conductive zirconia-based sintered material according to claim 1. The λ Charpy impact value is 0.1ks#IVafL or more.
The conductive zirconia-based sintered material described in . The carbide component consisting of at least one of 17,5 to 40
．． 0% by volume, the remainder is Y, 0. and or MgO 2-5
is AA20. A conductive zirconia-based sintering material having a composition substituted with Patent claim No. 4, which specifies that the porosity is less than or equal to the work volume RtaC
The conductive zirconia-based sintered material described in . α Charpy impact value is 0.1 kgfmAm or higher , TaC, Or, C2, ZrC, λ
・The carbide component consisting of at least one kind among 10□C9 to νC is 17.5 to 40.0% by volume, and the balance is Y2.
Z stabilized with O, and or MgO02-5 mol%
Conductive zirconia-based sintering characterized by hot press sintering in a non-oxidizing atmosphere in a mold with a large diameter and a r02 component. Method for producing binding material. a The hot press sintering conditions are a pressure of 50 kiJ or more,
8. The method for producing a conductive zirconia-based sintered material according to claim 7, wherein the temperature is 1300 to 1650°C. 9, TiC, NbC, TaC, Cr, C,, ZrC, N
The carbonized component consisting of at least one of o2C and WC is 17
．． 5 to 40.0% by volume, the balance being Y2O and or Mg
A homogeneous mixed powder with a composition consisting of a ZrO2 component stabilized with 2 to 5 mol% of O is molded into a desired shape, and then the molded body is prepared in a non-oxidizing atmosphere to a relative density of 94.5% or more. A method for producing a conductive zirconia-based sintered material, which comprises sintering and then isostatic pressure sintering (HIP) in a non-oxidizing atmosphere. la Isostatic pressure sintering (HIP) conditions are pressure 500
10. The method for producing a conductive zirconia-based sintered material according to claim 9, characterized in that the conductive zirconia-based sintered material is produced at a temperature of 1200 to 165[sigma]C. L TiC, NbC, TaC, Cr5C2, ZrC, M
The carbide component consisting of at least one of o2C and WC is 1
75 to 4011 volumes Hp (and the remainder is Y2O, and or M
A homogeneous mixed powder consisting of ZrO stabilized with 2 to 5 mol% of gO and a component replanted with Katso A1203 is hot-press sintered in a mold of the desired shape under a non-oxidizing atmosphere. A method for producing a conductive zirconia-based sintered material. 12 Hot press sintering conditions are a pressing force of 50 kq/cr
A-1 Features characterized in that the temperature is 1300 to 1650°C;
Zirconia^ (4 cans, method for producing binder material. la TiC, NbC, 'I'aC, Cr3C2, Zr
A carbonized component consisting of at least 1ε1 (C, Mo2C, WC) of 175 to 40.0% by volume, and the balance consisting of a Zr02 component stabilized with 2 to 5 mol% of Y2O and/or MgO, and A uniformly blended powder with a composition substituted with A403 is molded into a desired shape, and then the molded body is pre-sintered in a non-oxidizing atmosphere to a relative density of 94.5% or more, and then sintered in a non-oxidizing atmosphere. Direct isopressure sintering (HI
P) A method for producing a conductive zirconia-based sintered material. 14 Isostatic pressure sintering (HIP) conditions are pressure 500k
14. The method for producing a conductive zirconia-based sintered material according to claim 13, wherein the temperature is 1200 to 1650°C.