JPH084740B2 - Pressure / heat treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an apparatus for heat-treating an article to be treated in a pressurized gas. More specifically, a gas containing oxygen is used as the pressurized gas, and a heating furnace is installed inside the container for the pressurized gas and the article to be treated is placed in the heating furnace. This is a device for heat treatment.

[Conventional technology]

A device for heat-treating an object to be processed in a pressurized gas by installing a heating furnace in the pressurized gas container is commonly called HIP (Hot Isolation).
A variety of devices are known and used in addition to a device called a static press) that heats in the presence of high-pressure gas up to 2000 kgf / cm ² . Argon gas is often used as the type of high-pressure gas used in these devices, and nitrogen gas and others are also used, but a gas that is highly reactive is not usually used. On the other hand, performing pressurization / heat treatment in a pressurized gas containing oxygen gas is performed as a test,
It is known that there are effects such as improving the quality of the object to be processed, but because it is expected to be dangerous,
It has not been used in the actual production process.

[Problems to be solved by the invention]

When attempting to heat an object to be processed in a compressed gas containing oxygen gas, a part of the vessel or pipe containing the furnace may react with oxygen gas and generate high heat. The compressed gas may oxidize the container and spurt it out while spattering the high temperature molten oxide as a droplet. Such an accident does not always occur when pure oxygen gas of 1000 kgf / cm ² is used, and organic matter is present in the pressurizing chamber and reaches the ignition point, or the high-speed gas is damaged due to damage to the seal part. When a part of the parts is excessively heated and ignited by the flow, the parts constituting the device are burnt out by the spread of fire and ejected as oxides and the like.

Although such a risk can be reduced by handling precautions, etc., it is difficult to make sure that it is complete in the actual production process. Therefore, a case where an accident occurred while actually handling high-pressure oxygen gas Since there are many known cases, treatment in compressed gas containing oxygen gas was considered dangerous.

The present invention intends to eliminate such a danger and provide an apparatus capable of safely performing heat treatment in a compressed gas containing oxygen gas.

[Means for Solving the Problems] In order to achieve this object, the present invention directly contacts the high-pressure gas in an apparatus for heat-treating an object under the condition of a high-pressure gas containing oxygen gas. It is characterized in that a metal containing copper as a main component is used as a constituent material for the surface portions of the upper lid, the lower lid and the pressure resistant cylinder.

[Action]

Examining various cases of accidents in heat treatment using high-pressure oxygen gas, a part of the equipment emits high heat and scatters, and the phenomenon that the built-in gas ejects progresses remarkably rapidly and gives an impact close to an explosion. It turns out that there are even cases. The reason why the phenomenon progresses rapidly is that the heat generation rate and the amount of heat generated when high heat is emitted and scattered are extremely large. In this case, if the device ignites for some reason and a part of the device is damaged and the built-in gas begins to flow out, that part is exposed to a rapid gas flow while being kept at a temperature above the melting point, and the device becomes droplets. Scatter.

The heat that causes such a phenomenon is generated by the following reaction.

Fe + 1/2 O ₂ = FeO (3) It has been found from the analysis of ejecta that the reaction (1) proceeded, for example, when 100 atm of pure oxygen gas was ejected while burning an iron container. The reaction (3) is found when a mixed gas of 50% oxygen and 50% argon is ejected while burning a stainless steel component at 1400 kgf / cm ² . Reaction (2) is considered to occur at a gas composition that falls between the above two cases. These reactions (1),
The heat of reaction generated by (2) and (3) is standard state 298.
It is known to be 412 KJ / mol, 372 KJ / mol, and 272 KJ / mol at 5 ° ^K , respectively.

The heat of reaction reaches 3 to 4 times the amount of heat required to melt the reaction product. When gas flows, the liquid phase scatters as droplets, and the new surface of the metal phase continues to be exposed to the oxygen-containing gas, resulting in rapid reaction. If the heat of reaction is insufficient to heat the reaction product and surrounding materials to its melting point, such a vigorous reaction will not occur. Under normal conditions, when the metal is oxidized, the oxidation products form a solid phase on the surface of the metal,
The supply of oxygen is suppressed, and a rapid reaction that can be called combustion does not occur.

That is, when a high temperature is locally generated due to the ignition of organic matter, the basic cause of the metal phase being ignited and spread and damaged is the reaction heat between the metal phase containing iron as a main component and oxygen gas. However, it is larger than the material can be melted.
Therefore, if an alloy mainly composed of a metal with a small heat of reaction with oxygen gas is used as a structural material and it is confirmed that the alloy does not ignite or spread even if it is locally heated, it is possible to obtain a compressed gas containing oxygen gas. This makes it possible to design a device that can safely perform heat treatment at room temperature. From this point of view, as a result of an examination of ignition and spread of alloys containing various metals as main components, it was found that alloys containing copper as the main component did not ignite and spread even in high pressure oxygen gas. Moreover, it is known that the heat of reaction between copper and oxygen gas is also small, which is consistent with the experimental results.

On the basis of such a result, the present invention has solved the above-mentioned problems by forming a portion which is in direct contact with high pressure oxygen gas with a copper alloy.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a processing container for heat-treating an object to be processed in a high-pressure gas containing oxygen gas. The function of each part that constitutes this processing container is the same as that of the conventional HIP device, but the feature is that the materials that make up the parts are partially copper-based materials. This container has a cylindrical pressure resistant cylinder 2 and the same pressure resistant cylinder 2
It has a structure in which the upper and lower sides of the liner 17 which is the surface part of the are sealed by the upper lid 3 and the lower lid 4, and the heating furnace 9 composed of the heat insulating layer 16 and the heating element 15 is installed in the inside thereof, and the product to be treated is placed inside the liner 17. 14 is placed, high-pressure gas containing oxygen gas is press-fitted from the conduit 7, and electric heating is performed through the electric wire introducing portion 18, and temperature is measured to pressurize and heat the object to be processed. There is. Sealed parts on each part to prevent high pressure gas from leaking
There are 11, 12, and 21. The outside or inside of the pressure resistant cylinder 2 is cooled by a water cooling jacket.

Of these parts, the parts that need to be made of a material containing copper as a main component are the upper lid 3, the lower lid 4, and the liner 17. In this type of container, it is the lid seal parts 11 and 12 and the electric wire introduction seal part 21 that the metal member may be ignited and spread by high-pressure gas containing oxygen, resulting in damage to the device. Both of these parts are surrounded by a material containing copper as the main component, and even if a minute leak occurs, it gradually develops into a large-scale leak accompanied by a high-speed gas flow. Melting and scattering of the metal member due to the gas flow does not occur, and it can be limited to mere gas ejection similar to the gas leak in a normal HIP device that uses an inert gas as the pressure medium gas.

As a metal containing copper as a main component, ABP specified in Japanese Industrial Standard JISH3208 and AB specified in JISH3441
B, HBsB specified in JISH3425, PBPI, PB specified in JISH3731
P2 and PBP3, PBs specified in JISH3732, PBB specified in JISH3741, BeCnB specified in JISH3802, and corresponding metals containing copper as a main component, or equivalent materials specified in foreign industrial standards. There is.

The pressure of the high-pressure gas containing oxygen gas in the above example was set to 1 kgf / cm ² .

〔The invention's effect〕

According to the present invention, a metal containing copper as a main component is used as a constituent material on the surface portions of the upper lid, the lower lid, and the pressure-resistant cylinder that come into direct contact with high-pressure oxygen gas. In addition, it is possible to prevent the spread and melting of container components due to frictional heat caused by ignition or gas leak, and oxygen gas can be used for high temperature processing equipment under high pressure such as HIP equipment.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a side view showing the entire pressurizing / heating device according to the present invention, and FIG. 3 is a front view thereof. 1 …… Yoke frame, 5 …… Device stand, 6 …… Container moving cylinder, 8 …… Supply wiring, 10 …… Pressure / heat treatment device, 13…
… Pressurizing chamber, 19 …… Heating hearth

Claims (1)

[Claims] 1. A device for heat-treating an object to be processed under the condition of a high pressure gas containing oxygen gas, wherein the upper cover, the lower cover and the pressure-resistant cylinder are in direct contact with the high pressure gas.
A pressurization / heat treatment apparatus characterized in that a metal containing copper as a main component is used as a constituent material.