JPH0440157Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to a pressure sintering furnace for sintering ceramics, metal powder, etc. in a pressurized gas atmosphere.

``Prior Art'' As this type of pressure sintering furnace, those shown in FIGS. 3 and 4 have been widely used.
This conventional pressure sintering furnace has a cylindrical heating chamber 2 provided inside a horizontally placed cylindrical furnace body 1 with a heat insulating material.
An inner case 3 is further provided inside the heating chamber 2, and a plurality of heaters 4 (12 in this example) are installed surrounding the inner case 3 between the heating chamber 2 and the inner case 3. It's summery. In this conventional sintering furnace, the inside of the furnace is pressurized by atmospheric gas (generally an inert gas), and the workpiece 5 placed in the inner case 3 is heated in the pressurized gas atmosphere. There is. In FIG. 4, reference numerals 6, 7, and 8 are the lids of the furnace body 1, heating chamber 2, and inner case 3, respectively.

"Problem that the invention aims to solve" By the way, when sintering is performed using the sintering furnace as described above, in order to obtain a high-quality sintered product, it is necessary to uniformly heat the object 5 from its surroundings. is important, and for this purpose it is necessary that there be no variation in temperature at each location within the furnace.

However, in the above-mentioned furnace where processing is carried out under a pressurized gas atmosphere, natural convection of the atmospheric gas occurs within the heating chamber 2, and the high temperature atmospheric gas rises to the upper part of the heating chamber 2 and is deposited there. I ended up staying,
Therefore, a temperature distribution state occurs in which the temperature in the upper part of the heating chamber 2 is higher than the temperature in the lower part.

Furthermore, in the conventional sintering furnace described above, natural convection similarly occurs outside the heating chamber 2 within the space 9 formed by the inner surface of the furnace body 1 and the outer surface of the heating chamber 2.
The upper part of the space 9 was hotter than the lower part. For this reason, the temperature difference between the upper and lower parts of the heating chamber 2 is further exacerbated, and the temperature difference becomes extremely large, resulting in a problem that the lower part of the object to be processed 5 cannot be sufficiently heated. Such problems are
This becomes more noticeable as the pressure inside the furnace becomes higher, as the density of the atmospheric gas changes and natural convection is promoted.

This idea was made in view of the above circumstances, and the purpose is to provide a pressure sintering furnace that can improve the temperature distribution in the heating chamber and evenly heat the workpiece from its surroundings. .

"Means for Solving the Problem" This invention consists of a heating chamber disposed inside a furnace body capable of maintaining a pressurized state, and a heater disposed inside the heating chamber. and a pressure sintering furnace configured to heat a workpiece placed inside the heating chamber in a pressurized gas atmosphere by pressurizing the inside of the heating chamber with atmospheric gas, the furnace body The heating chamber is characterized in that a plurality of partition plates are provided between the inner surface of the heating chamber and the outer surface of the heating chamber to vertically partition the space formed by the partition plates.

"Function" In the pressure sintering furnace of this invention, the external space of the heating chamber, that is, the space between the inner surface of the furnace body and the outer surface of the heating chamber, is vertically partitioned with a partition plate, so that the atmospheric gas in the space is This reduces the temperature difference by suppressing the natural convection of the heating chamber, thereby reducing the temperature difference within the heating chamber.

"Embodiment" Hereinafter, an embodiment of this invention will be described with reference to FIG. FIG. 1 is a front cross-sectional view showing the schematic configuration of the pressure sintering furnace of this embodiment. The same reference numerals as those in the figure are used to omit the explanation.

The pressure sintering furnace of this embodiment has the same configuration as the conventional sintering furnace described above, as well as an inner surface of the furnace body 1 and a heating chamber 2.
A plurality of partition plates 10 (eight in this example) are attached radially in the radial direction of the furnace body 1 between the outer surface of the furnace body 1 and the space 9 in the vertical direction. 8 small spaces divided into 11...
...is formed.

In this sintering furnace, the atmospheric gas introduced into each small space 11... only convects within each small space 11... as shown in FIG.
Therefore, although there is a slight temperature difference between the upper and lower parts of each small space 11, the space 9
The overall temperature distribution is maintained approximately evenly between the top and bottom.
As a result, the temperature outside the heating chamber 2 becomes approximately equal between the upper and lower portions, and therefore the temperature difference between the upper and lower portions inside the heating chamber 2 is also reduced compared to the conventional sintering furnace.

As explained above, according to this sintering furnace, the temperature distribution inside the heating chamber 2 is improved, and the temperature at each position in the heating chamber 2 approaches the desired set temperature, so that the workpiece 5 is It is possible to heat almost evenly from the sintered surface and obtain high quality sintered products.

Although one embodiment of this invention has been described above, this invention is not limited to the above embodiment. For example, the number of partition plates 10 . . . to be attached may be as long as at least two or more, but the larger the number (that is, the smaller the volume of the small space 11 . . . ), the more convection will be suppressed. Be effective. Furthermore, the mounting positions of the partition plates 10 may be any suitable positions as long as they partition the space 9 into upper and lower parts.

In addition, as shown in FIG. 2, there is also a partition plate 12 between the heating chamber 2 and the inner case 3 in the same manner as above.
If... is provided, natural convection inside the heating chamber 2 can also be suppressed at the same time, and the temperature distribution inside the heating chamber 2 can be further improved.

In the above embodiment, the heating chamber 2 and the inner case 3 have a cylindrical shape, but even if they are rectangular, the partition plate 10 can be provided in the same way, and in that case, the same as described above can be applied. A similar effect can be obtained. Moreover, it goes without saying that this invention can be applied not only to horizontal furnaces but also to vertical furnaces.

"Effects of the invention" As explained in detail above, according to this invention, a plurality of partition plates are provided to partition the space between the inner surface of the furnace body and the outer surface of the heating chamber into upper and lower parts, so that convection within the space is suppressed, and the internal temperature is approximately equal between the upper and lower portions, thus achieving the effect that the temperature difference inside the heating chamber can be reduced. Therefore, it becomes possible to uniformly heat the object to be processed from its surroundings, and a high-quality sintered product can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of this invention. Figure 1 is a front sectional view showing a schematic configuration of one embodiment of this invention, and Figure 2 shows another example of the configuration of this invention. FIG. 3 and 4 show the schematic structure of a conventional sintering furnace, with FIG. 3 being a front sectional view and FIG. 4 being a side sectional view. 1...Furnace body, 2...Heating chamber, 4...Heater,
5...Processing object, 9...Space, 10...Partition plate,
11...Small space.

Claims (1)

[Scope of utility model registration request] A heating chamber is disposed inside a furnace body capable of maintaining a pressurized state, and a heater is disposed inside the heating chamber, and the inside of the furnace body and the heating chamber are heated by atmospheric gas. In a pressure sintering furnace configured to heat a workpiece placed inside a heating chamber in a pressurized gas atmosphere by applying pressure,
A pressure sintering furnace characterized in that a plurality of partition plates are provided between the inner surface of the furnace body and the outer surface of the heating chamber to vertically partition a space formed by them.