JPH06346106A - Production of sintered member - Google Patents

Abstract

PURPOSE:To produce a sintered member free from structural segregation, surface flaws, contamination or the like by forming the surface of a supporting member of the carbide or oxide of the metal to be heat-treated, thereafter placing the metal to be heat-treated thereon under no pressure and executing heating treatment. CONSTITUTION:At least a part of the surface of a supporting member having a prescribed shape is coated with the metal to be heat-treated, and after that, coating metal is formed of carbide or/and oxide. On the obtd. supporting member for heat treatment, the metal to be heat-treated of a powder formed body or the like is placed and introduced without pressurizing, and heating treatment is executed. In this way, the sinterted member small in the intrusion of gas and impurities and furthermore small in surface flaws can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintered member in which gas and impurities are less mixed and surface damage is small.

[0002]

2. Description of the Related Art In recent years, as plants have grown in size, electronic devices centering on semiconductor parts have become highly integrated, and systems have become highly functional, demands for materials and parts have become severe and sophisticated. In order to meet this demand, materials or parts are required to be highly purified while maintaining the price at an industrial level. In general, these materials or parts are materials obtained by melting, sintering, sintering / infiltration in a predetermined atmosphere level after pressurizing / molding, using raw materials that have been thoroughly examined. Is subjected to various steps such as heat treatment and finishing to obtain the desired product or semi-finished product. Here, for the raw materials that have been thoroughly examined, it is possible to industrially easily prepare raw materials and powders having the target performance due to the recent progress of refining technology and pulverization technology. For example, the atmosphere in each process is
It is also possible to economically and easily prepare high-performance equipment capable of performing work in an inert or reducing atmosphere such as vacuum, nitrogen, argon, or hydrogen. However, in the heat treatment step, it is not possible to easily prepare, on an industrial level, to accurately quantify and control various conditions at the moment when the treatment is performed. Therefore, the raw material technology becomes particularly important.

That is, the present inventor examined each of the above steps for the purpose of obtaining a sound material or part having a target performance. Variations in the characteristics of the molded product that are thought to be due to processing technology, and (b) the physical and chemical states of the melting crucible and sintering boat that are used by heating together with the material or parts during heat treatment such as melting and sintering. By the influence of
It has been found that the quality of the obtained material or part (product) (for example, the soundness of the surface condition) is affected.

As the raw material powder for powder metallurgy, metal powders such as copper, iron, nickel, chromium, titanium, tungsten and tantalum, and alloy powders such as stainless steel are generally used. Using these powder metallurgy raw material powders, in the heat treatment performed when manufacturing the material or component, in order to generally support the material or component during the heat treatment, a heat treatment support member (container, crucible, Boats) are essential. In this way, the material or component is inserted into or placed on a heat treatment support member (hereinafter, also referred to as a heat treatment container) and heat-treated to obtain a product or a semi-finished product.
The material or part comes into direct contact with graphite, which is the material for the heat treatment container, during the heat treatment, and there are cases in which the material or part and metal exhibit a metallurgical reaction. As a result, the material or part may not be taken out of the heat treatment container in a sound form and may be damaged, or the heat treatment container may be destroyed, resulting in surface shape inconvenience. These are not only fatal damages as products, but also economic loss is a serious problem.

On the other hand, when a heat treatment container made of calcium oxide (calcia) or yttrium oxide (yttria) is selected as the material for the heat treatment container, no remarkable metallurgical reaction as in the case of the above carbon is observed, and the surface shape A sintered member having no damage can be obtained. However, a normal graphite or calcium oxide (calcia) or yttrium oxide (yttria) container for heat treatment is porous, and a large amount of water and gas are present on the surface and inside thereof. There may be some inconvenience of directly contaminating the material or component surface during the heat treatment.
In particular, these surfaces cannot be finished so smooth that adsorbates are sufficiently reduced, and water, gas, and other surface deposits tend to be present on the surfaces. In addition, even if there is no inconvenience in terms of surface shape, gas entrapment inside the molded body due to molding technology and segregation on the structure due to uneven sintering due to uneven molding pressure distribution Such internal disadvantages remain. Further, there is a case in which impurities in the heat treatment container diffuse and invade into the material or the component due to the metallurgical reaction, and the purity of the material or the component after the heat treatment may be lowered. Such inconvenience hinders the production of sound materials or parts and poses a problem.

[0006]

The problems of the above-mentioned prior art will be summarized and described. Problem 1; In the production of a sintered member, prior to heat treatment, raw material powders are mixed, and then a powder compacted into a predetermined shape by a molding press machine is subjected to sintering and heat treatment. . By compacting the raw material powder, the workability during heat treatment (sintering) is improved, the volume of the raw material powder is reduced, the sinterability is improved, and the density of the member after sintering is increased. And many other benefits.

However, since the powder is compressed by the molding press machine, the gas is unavoidably left inside and the sintered body is discolored or oxidized during the heat treatment (sintering), or the volume expansion of the gas is caused. Problems such as swelling and deformation of the sintered body may be observed. All of these are considered to be due to the confinement of gas during molding, and the outlet is closed due to the progress of sintering before the gas is sufficiently discharged to the outside during sintering. Also, due to the difference in the fluidity of the raw material powder when loaded into the mold, the difference in the pressure transmission to the raw material powder of the molding pressure related to the molding technology at the time of molding, etc., there is little variation in density and the like. The production of various molded bodies and / or sintered bodies is
It has become difficult. This is because the pressure applied to each molded product during the molding operation of each molded product is not uniform, but the pressure due to the location inside the molded product after pressurization due to the difference in fluidity described above. It is thought that this is due to the difference in distribution.

Problem 2; At the time of sintering the molded body,
A carbon heat treatment container is known as a container for accommodating the molded body under heat treatment. This utilizes the excellent reducing power of carbon at high temperatures and the low wettability with many metals, and is widely used industrially.

[0009] However, although the carbon heat treatment container has the above-mentioned advantages, on the other hand, depending on the material to be heat treated or the kind of parts, a remarkable metallurgical reaction occurs between the two and the material in a sound state or It is an obstacle to the manufacture of parts. For example, as materials or parts,
If you select iron, chromium, titanium, etc., iron carbide,
The formation of chromium carbide and titanium carbide undesirably damages the surface of the material or parts and destroys the heat treatment container. As a technique for suppressing such metallurgical reaction, a technique for interposing an aluminum oxide fine particle layer between the two has been developed. However, iron, chromium, titanium, etc. may be affected by moisture or gas existing in the gaps between fine particles or on the surface of fine particles, which may be an obstacle to the production of materials or parts in a sound state. .

Problem 3; As heat treatment vessels, heat treatment vessels made of nitride such as boron nitride and heat treatment vessels made of oxide such as calcium oxide and yttrium oxide are known. This utilizes the unique property that nitrides and oxides are difficult to wet with many metals at high temperatures, and is used industrially.

However, although the nitride heat treatment container has the above-mentioned advantages, there are problems that the use is restricted depending on the atmosphere and the decomposition temperature is relatively low. Further, the influence of the surface adsorption gas and impurities cannot be avoided even in the oxide heat treatment container as described above.

[0012] Therefore, an object of the present invention is to provide a method for producing a sintered member, which can obtain a sintered member free from structural segregation, surface damage, contamination and the like.

[0013]

In order to solve the above-mentioned problems, the present invention firstly proposes that at least a part of the surface of a supporting member having a predetermined shape is made of a carbide of a heat-treated metal or /
And a first step of obtaining a support member for heat treatment made of an oxide, and a second step of placing and introducing a metal to be heat-treated on the support member for heat treatment without applying pressure, and performing heat treatment. And

Second, after at least a part of the surface of the supporting member having a predetermined shape is coated with the heat-treatable metal, at least a part of the coated heat-treatable metal is treated with a carbide or / and an oxide of the heat-treatable metal. The gist of the present invention is to have a first step of obtaining the heat treatment support member described above, and a second step of placing and introducing the metal to be heat treated onto the heat treatment support member without applying pressure, and performing heat treatment.

Thirdly, the first step of obtaining a heat treatment support member in which at least a part of the surface of the support member having a predetermined shape is made of chromium carbide and / or chromium oxide, and a raw material Cr is added to the heat treatment support member. The gist of the present invention is to have a second step of placing and introducing without pressing and heat treatment.

Fourth, a first step of obtaining a heat treatment support member in which at least a part of the surface of the support member having a predetermined shape is coated with Cr, and the raw material Cr is used for the heat treatment support member.
The second step is to place, introduce and heat-treat without heating.

Fifth, at least a part of the surface of the supporting member having a predetermined shape is coated with Cr, and at least a part of the coated Cr is chromium carbide or / and chromium oxide to obtain a supporting member for heat treatment. And the second step of placing the raw material Cr on the support member for heat treatment without applying pressure, introducing the raw material Cr, and performing heat treatment.

Sixthly, in the first to fifth structures, the material of the supporting member having the predetermined shape is carbon.

Seventhly, in the above-described first to fifth structures, the material of the supporting member having the predetermined shape is calcium oxide.

Eighthly, in the above-mentioned first to fifth structures, the gist is that the material of the supporting member having the predetermined shape is yttrium oxide.

[0021]

In the above structure, first, at least a part of the surface of the supporting member is treated as a carbide or / and an oxide of the metal to be heat treated, and the metal to be heat treated is placed and introduced into the metal to be heat treated, It is possible to avoid direct contact between the heat treatment support member material and the heat treated metal.
As a result, there is no metallurgical reaction between the two, and the sintered member is not subject to surface damage or contamination.
In addition, by placing and introducing the metal to be heat-treated on the support member for heat treatment without applying pressure, it is possible to make the sintering non-uniform due to the non-uniformity of the molding pressure distribution caused by pressure molding. It is possible to prevent the occurrence of systematic segregation.

Secondly, in the surface portion of the support member for heat treatment, after at least a part of the surface of the support member is coated with the metal to be heat treated, at least a part of the coated metal to be heat treated is a carbide or / and / or metal of the metal to be heat treated. As an oxide,
Similar to the above, it becomes possible to prevent the metallurgical reaction between the material for the heat treatment supporting member and the metal to be heat treated.

Thirdly, in the production of the Cr corrosion-resistant sintered member, for the same purpose as in the first case, at least a part of the surface of the supporting member is made of chromium carbide or / and chromium oxide, so that the heat treatment is performed. It becomes possible to prevent a metallurgical reaction between the support member material and the raw material Cr.

Fourthly, in the production of the Cr corrosion resistant sintered member, even if at least a part of the surface of the supporting member is covered with a Cr film, the supporting member material for heat treatment and the raw material C are similarly used.
It is possible to prevent metallurgical reactions with r.

Fifth, in the production of a Cr corrosion-resistant sintered member, for the same purpose as in the second case, after at least a part of the surface of the supporting member is covered with a Cr film, at least a part of the Cr film is carbonized. Even if chromium and / or chromium oxide is used, it is possible to prevent a metallurgical reaction between the heat treatment support member material and the raw material Cr.

Sixth, the supporting member is made of carbon, which has excellent reducing power at high temperature and low wettability with many metals, so that the above-mentioned surface damage and contamination of the sintered member are caused. It is possible to achieve a better prevention effect of.

Seventh and eighth, by using calcium oxide or yttrium oxide, which has low wettability with many metals at high temperature, as the material of the supporting member, the same effect as in the case of the sixth case can be obtained. It becomes possible to obtain.

[0028]

EXAMPLES Examples of the present invention will be described below with reference to Table 1 by way of specific examples. The main purpose of the manufacturing method of this embodiment is to place the target metal to be heat-treated (raw material powder) on a heat-treatment supporting member satisfying a predetermined surface condition without applying an external pressure, and after introducing the heat-treated metal Is to heat and sinter together with the support member for heat treatment to obtain a sintered member. Therefore, the type of target heat treated metal is
It is not particularly limited, and here, Cr is first selected as a representative metal of the heat-treated metals and specifically described.

Experiment: Surface was extremely cleaned, thickness 3
Using a high purity Cr plate of mm, a heat treatment container made of a metal Cr plate was prepared. Using Cr cake obtained by forging after arc melting, Cr anti-corrosion flange parts were manufactured. An experiment was conducted in which the Cr anticorrosion flange component was placed in direct contact with the metal Cr plate heat treatment container and heat-treated at 810 ° C. in vacuum. As a result, a strong interdiffusion phenomenon was observed between the Cr plate heat treatment container and the Cr anti-corrosion flange parts, and the Cr anti-corrosion flange parts could not be taken out from the container without damage, and sound Cr It was not possible to obtain a manufactured anti-corrosion flange part. However, there was absolutely no surface contamination of the Cr anti-corrosion flange parts and no penetration of impurities into the inside.

Experiment: thickness of 3 mm with extremely clean surface
A high-purity Cr plate of No. 3 was used to prepare a metal Cr plate heat treatment container. 4 ton / cm ^{2 of} fully degassed Cr powder
Corrosion resistant gear parts made of Cr powder with a diameter of 42 mm pressed by. An experiment was conducted in which the above-mentioned Cr powder corrosion-resistant gear part was placed in direct contact with the metal Cr plate heat treatment container and subjected to heat treatment at 810 ° C. in a vacuum. As a result, C
Although the r-made gear parts were subjected to the same heat treatment as in the same experiment, a strong mutual diffusion phenomenon was observed between the Cr plate heat treatment container and the Cr powder-made gear parts as in the case of the experiment. No damage was observed, and the degree of damage was lower than in the case of the experiment, and the Cr part could be taken out from the container. However, the locally welded part remained as a trip mark. As with the experiment, neither surface contamination nor penetration of impurities into the interior was observed. That is, the present inventors, except for the difference in the surface damage problem of the material or parts at the time of extraction by both experiments,
From the viewpoint of surface contamination and invasion of impurities into the inside, it was found that a high-purity metal having the same material as the heat-treated metal (raw material) is useful as a heat treatment container (heat treatment support member). Moreover, considering the fact that the surface damage problem was minor in the latter experiment, the Cr powder was sufficiently degassed and subjected to heat treatment prior to the latter experiment, but nevertheless, It is considered that the appropriate amount of surface gas remaining in the Cr powder acted on the surface of the heat treatment container whose surface was extremely cleaned, and appropriately produced a film that was difficult to wet. As a result of microanalysis, the product was a compound of Cr, O and C.

In each of the experiment and the example 1; the experiment, a flange part (experiment) and a gear part (experiment) were manufactured and processed from a pre-produced Cr material (ingot) and used as a heat-treated metal. Therefore, as a result of including the step of manufacturing the Cr material (ingot) in the man-hours required to reach the final product, the price of the final product is affected. Also, as in the experiment, when the powder compact (Cr powder) is used as the heat-treated metal, the amount and location of pores and gas are likely to vary, especially when gas is present in the closed interior. Explosive gas release during heat treatment,
It may also cause surface damage. Therefore, in order to allow the gas to be released from the inside during the heat treatment in a singular manner, the state of the heat-treated metal to be used is made of a Cr material (ingot) as in the case of the experiment, that is, a lump in advance, or in the case of the experiment. In order to make it possible to easily release gas, an experiment was carried out in which the powder compact was introduced into the heat treatment container as it was in order to make it easy to discharge gas. According to the suggestion of the experiment, the heat treatment container was made of carbon as a raw material, and the surface thereof was coated with the same Cr as the heat-treated metal by an ion plating method with a thickness of 0.1 μm. As a result, a sintered member having less gas and impurities and less surface damage was obtained (experiment, Example 1).
As a container for heat treatment, the thickness of 3
When a heat treatment container made of a metal Cr plate using a high-purity Cr plate of mm was used, the amount of gas in the heat-treated metal, which is considered to be due to the quality variation of the metal Cr plate, tended to vary ( Experiment Comparative Example 1).

Experimental Example 2;
In the above experiment, the surface of the high-purity Cr plate heat treatment container used was extremely cleaned before use, but the above results were considered to be different due to the difference in the state of the heat-treated metal. Therefore, as an experiment, the present inventors produced a heat treatment container in which an extremely thin Cr coating having a thickness of about 0.1 μm was previously formed on the surface of the carbon heat treatment container by a sputtering method. When this heat treatment container was used to perform the same heat treatment as in the experiment, the heat-treated metal (Example 2) could be taken out from the heat treatment container in a sound state without surface damage, and the component was not contaminated by surface contamination. There was no intrusion of impurities into the interior.

Experiments 3 and 4; As an experiment, an extremely thin Cr film having a thickness of about 0.1 μm was formed on the surface of carbon, and then the surface was subjected to sputtering to control the atmosphere and Cr ₂ O. ₃ as (Cr-Cr ₂ O ₃ )
A heat treatment container having a coating formed on carbon was produced (Example 3). Further, in the same manner, a container for heat treatment was produced in which an extremely thin (Cr—Cr ₃ C ₂ ) coating having a thickness of about 0.1 μm was formed on carbon (Example 4). When heat treatment similar to the experiment was performed using these heat treatment vessels, the heat-treated metal Cr could be taken out from the heat treatment vessel in a sound state without surface damage, and the parts were
There was no surface contamination or intrusion of impurities into the interior (Examples 3 and 4).

Experiment, Example 5, Comparative Example 2; As an experiment, a thickness of 100 was obtained by vacuum evaporation while adjusting the atmosphere.
A container for heat treatment was produced in which a (Cr—Cr ₂ O ₃ ) coating of about μm was formed on carbon. When this heat treatment container was used to perform the same heat treatment as in the experiment, it was possible to take out the heat-treated metal Cr in a sound state from the heat treatment container in a sound state, and at the There was no intrusion of impurities into the inside (Example 5). Further, a heat treatment container in which a (Cr—Cr ₂ O ₃ ) coating having a thickness of about 0.01 μm was formed on carbon was prepared by adjusting the atmosphere by a sputtering method. When this heat treatment container was used to perform the same heat treatment as in the experiment, it was found that the metal Cr to be heat treated could be taken out from the heat treatment container in a substantially sound state although it was slightly damaged by the surface. . However, due to the fact that the thickness of the coating was not required, moisture and gas existing on the surface and inside of the graphite diffused to the heat-treated metal Cr during heat treatment, causing surface discoloration, contamination, and internal Cause the invasion of impurities,
It was not possible to obtain a sound Cr part (Comparative Example 2).

Experiments Examples 6, 7 and 8: In the above experiment, C was used as the material of the heat treatment container.
An r plate or carbon was used, and the surface thereof was coated with metallic chromium or chromium oxide having predetermined conditions (Examples 1 to 1).
6). However, the present invention is not limited to these, and the object can be achieved. That is, even if the above-mentioned Cr plate or calcium oxide or yttrium oxide other than carbon is used as the material for the heat treatment container, the heat treatment container whose surface is set to a predetermined condition is used, and the metal to be heat treated (raw material) is added. According to the method of the present invention in which the metal to be heat treated (raw material) is heated and sintered together with the container for heat treatment by placing and introducing into the container for heat treatment without pressing, the effect can be achieved (Examples 6 and 7). ) Was found. That is, after coating the surface of a heat treatment container made of calcium oxide with 0.1 μm of Cr, the Cr was changed to chromium carbide (mainly Cr ₃ C ₂ ) (Example 6), and yttrium oxide for heat treatment was used. The surface of the container was coated with 0.1 μm of Cr, and then Cr was changed to chromium oxide (mainly Cr ₂ O ₃ ) (Example 7). In addition, after coating the surface of the heat treatment container made of calcium oxide with 0.1 μm of Cr, the Cr is mixed with chromium carbide (mainly Cr ₃ C ₂ ) and chromium oxide (mainly Cr ₂ O ₃ ). (Example 8).

After the metal to be heat treated (raw material) is introduced and placed in the heat treatment container, the porosity of the sintered member, that is, the theoretical density, is adjusted by adjusting the heat treatment temperature, the grain size of the raw material, the addition of the sintering aid, and the like. It is possible to adjust the ratio of voids to a wide range of about 30 to 95%. Although Cr has been described as a representative example of the metal to be heat-treated (raw material), when the metal to be heat-treated (raw material) is Ti, the surface of the heat-treating container is T
By using at least a part of titanium oxide and / or titanium carbide as i, a similarly high quality sintered member can be obtained.

The present inventors have found that even in a heat treatment container in which a metal coating film is formed on a carbon heat treatment container, there is no surface damage, surface contamination, and intrusion of impurities into the interior.
It was found that a product or a semi-finished product in a healthy state can be obtained, but if the thickness of the metal coating on the carbon heat treatment container is inappropriate, a strong mutual diffusion phenomenon is observed, which is not preferable.

As described above, based on the above findings, the present inventor has found that the pressure applied to the raw material powder before sintering is not only for each sintered member but also for the microscopic portion inside each sintered member. The present invention has been completed as a result of a synergistic effect of the study on the technology that makes constant and the above-mentioned experimental study.

[0039]

[Table 1] Condition No. Heat treated metal Heat treated support member Heat treatment condition Container material Surface test: Reference Arc melted Cr Cr Vacuum Cr cake 810 ° C (Cr contact resistant flange parts) Experiment: Reference Degassed Cr Cr Same as above Cr powder compact ( Cr powder corrosion resistance gear parts) Experiment: Example 1 Degassed carbon Carbon Same as above Cr powder 0.1 μm thick Cr was coated by ion plating method Same as above: Comparative Example 1 Same Cr plate Cr plate as experiment Same as above (thickness: 3 mm) Experiment: Same as in Example 2 Experiment Carbon: Carbon surface was coated with Cr of 0.1 μm thickness as above by sputtering method Experiment: Same as Example 3 Experiment: Same as above in carbon carbon surface of 0.1 μm thickness ( Cr ₂ O ₃₎ coating experiment a film by a sputtering method: the same ditto carbon surface as in example 4 experiments ibid 0.1 [mu] m thickness (Cr ₃ C ₂₎ scan the film Coating by Tattering method: Example 5 Same as in experiment Same as above Same as above Carbon coating with 100 μm thickness of Cr as above by vacuum deposition method Same as above: Comparative example 2 Same as in experiment Same as above Same as carbon surface sputtering with 0.01 μm thickness of Cr as above Experiment: Same as in Example 6 Same as experiment: Oxidation of calcium oxide Same as above Oxidation of calcium on surface of Cr with 0.1 μm thickness of Cr ₃ C ₂ by sputtering method Same as above: Example 7 Same as experiment Oxidation Yt Oxide Same as above Yttrium surface coated with Cr 0.1 μm thick Cr part of which was made Cr ₂ O ₃ by the same method Same as above: Example 8 Same as experiment Oxidation calcium oxide Same as above Si 0.1 μm on surface of calcium Coated with a thickness of Cr, part of which was mixed with Cr ₂ O ₃ and Cr ₃ C ₂ by sputtering

[0040]

As described above, according to the present invention, firstly, since at least a part of the surface of the heat treatment supporting member is made of the carbide or / and the oxide of the metal to be heat treated,
It is possible to avoid direct contact between the heat-treating support member material and the heat-treatable metal during the heat treatment, no metallurgical reaction occurs between the two, and there is no surface damage or contamination damage. The member can be obtained. In addition, since the metal to be heat treated is placed on the support member for heat treatment without being pressed and is introduced and subjected to heat treatment, the non-uniformity of the sintering due to the non-uniformity of the molding pressure distribution caused by the pressure molding, etc. It is possible to prevent homogenization and obtain a sintered member without structural segregation.

Secondly, the heat-treating support member has at least a portion of its surface coated with the metal to be heat-treated, and at least a portion of the coated metal to be heat-treated is a carbide or / and an oxide of the metal to be heat-treated. The same effect as that of the first invention can be obtained.

Thirdly, at the time of producing the Cr corrosion resistant sintered member, at least a part of the surface of the supporting member is made of chromium carbide and / or chromium oxide, so that the same effect as the first invention can be obtained.

Fourthly and fifthly, in the production of the Cr corrosion resistant sintered member, at least a part of the surface of the supporting member is coated with a Cr film, or at least a part of the surface of the supporting member is made of Cr.
After coating with the film, since at least a part of the Cr film is made of chromium carbide and / or chromium oxide, the same effect as the third invention can be obtained.

Sixth, since the material of the supporting member is carbon, the surface of the sintered member in the first to fifth inventions is excellent due to its excellent reducing power at high temperature and low wettability with many metals. The effect of preventing physical damage and pollution can be better achieved.

Seventh and eighth, since the material of the supporting member is calcium oxide or yttrium oxide, its low wettability with many metals at high temperature provides substantially the same effect as the sixth invention. To be

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Okutomi No. 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corp. (72) Inventor Kadan Sekiguchi, 8 Shinsita-cho, Isogo-ku, Yokohama, Kanagawa Inside the Yokohama office

Claims (8)

[Claims] 1. A first step of obtaining a support member for heat treatment in which at least a part of a surface of the support member having a predetermined shape is a carbide or / and an oxide of a metal to be heat treated, and a metal to be heat treated on the support member for heat treatment. A second step of placing, introducing and heat-treating, without applying pressure. 2. A heat treatment in which at least a part of the surface of a supporting member having a predetermined shape is coated with a heat-treatable metal, and at least a portion of the coated heat-treatable metal is a carbide or / and an oxide of the heat-treatable metal. Of the sintered member, comprising: a first step of obtaining a supporting member for heat treatment; and a second step of placing a metal to be heat-treated on the supporting member for heat treatment without applying pressure, introducing the metal to be heat-treated, and performing heat treatment. Production method. 3. A first step of obtaining a heat treatment support member in which at least a part of the surface of the support member having a predetermined shape is made of chromium carbide and / or chromium oxide, and a raw material Cr is pressed against the heat treatment support member. A second step in which the sintered member is placed, introduced and heated. 4. A first step of obtaining a heat treatment support member in which at least a part of the surface of the support member having a predetermined shape is coated with Cr, and a raw material Cr is placed and introduced on the heat treatment support member without applying pressure. And a second step of performing heat treatment. 5. A first step of obtaining a support member for heat treatment, in which at least a part of the surface of the support member having a predetermined shape is coated with Cr, and at least a part of the coated Cr is chromium carbide or / and chromium oxide. And a second step of placing the raw material Cr on the support member for heat treatment without applying pressure, introducing the raw material Cr, and performing heat treatment. 6. The method for manufacturing a sintered member according to claim 1, wherein the material of the support member having the predetermined shape is carbon. 7. The method for manufacturing a sintered member according to claim 1, wherein the material of the supporting member having the predetermined shape is calcium oxide. 8. The material of the supporting member having the predetermined shape is yttrium oxide.
6. The method for manufacturing a sintered member according to any one of 5 to 5.