JPH02225373A - Method for firing continuous silicon carbide product - Google Patents

Abstract

PURPOSE:To prevent continuous substances to be fired from cracking and breaking off by arranging them along the continuous plates made of a refractory which are placed so that they cover the inner walls of multi-stacked muffles. CONSTITUTION:Cylindrical refractory parts 14 are stacked to form a muffle 11 having a upright hollow 11a. Continuous covering plates made of a refractory substance are placed along the inner wall of the muffles so that they cover the inner wall. Then. continuous substances 12 of silicon carbide to be fired are placed upright along the covering plates 18 so that they support one another to fulfill the hollow part. Firing is carried out. Thus, the substances to be fired can avoid undertaking local force whereby the products are prevented from cracking and breaking off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for firing a long product made of silicon carbide, such as a long vibrator, which is used as a shelf assembly material in a kiln.

(Prior Art) Silicon carbide (SiC) fired products are excellent in heat resistance, mechanical strength, and the like. For this reason, silicon carbide is molded and fired into a long shape such as a vibrator, and when firing a large long-stem insulator, it is inserted into the hollow part and used as a so-called intermediate support rod to prevent it from falling. Sometimes. Furthermore, in recent years, it has been considered to use silicon carbide vibes as a material for shelving in kilns.

By the way, since high-quality silicon carbide products do not contain clay in their raw materials, unfired products are extremely brittle and may crack or chip due to small forces. Furthermore, the length of the materials used for shelving in the kiln is 2 to 3 meters, making it especially difficult to handle unfired products. The following methods are known as methods for firing such long products.

That is, as shown in FIGS. 4 and 5, first, a plurality of divided cylinders 1 made of carbon are stacked on a bottom plate 2 in a plurality of stages to form a pine full 3 having a vertically long accommodation cavity 3a. A large number of products to be fired 4 made of silicon carbide and shaped into the shape of a long round vibrator, for example, are accommodated in this accommodation cavity 3a.

In this case, the product to be fired 4 placed on the outermost periphery is
The products to be fired 4 are arranged upright along the inner wall of the oven, and the other products 4 to be fired are arranged and housed so as to support each other. In addition, if there is a space in the matsufuru 3 in which the product 4 to be fired is not accommodated, for example, two semicircular carbon partition lids 5, 5 may be placed so that the product 4 to be fired can be moved laterally. I will support you so that you don't.

The Matsufuru 3 containing the product 4 to be fired as described above is carried into a furnace (not shown) by, for example, a hand lift, and then the inside of the Matsufuru 3 is heated in an inert gas atmosphere to fire the vibrator. .

(Problem to be Solved by the Invention) By the way, the Matsufuru 3 is generally made of carbon, which has excellent heat resistance and thermal conductivity, but it requires the elongated accommodation cavity 3a as described above. However, since it is difficult to manufacture the tube as a single piece, it is necessary to adopt a structure in which the divided cylinder bodies 1 are stacked as described above. For this reason, as shown in FIG. 6, a step may occur on the inner wall of the matsufuru 3 due to misalignment at the joint between the divided cylindrical bodies 1. As a result, the product to be fired 4 in contact with the inner wall of the matsufuru 3 is supported at several contact points a on the matsufuru 3, as shown in FIG. The product 4 to be fired, which is supported by point contact in this way, is subject to force acting concentratedly on the contact point a, and cracks and chips may occur due to tilting or vibration of the entire product during transportation using a hand lift, for example. It had the disadvantage that it was easily damaged.

The present invention has been made in view of the above circumstances, and its purpose is to provide a method for firing long products made of silicon carbide that can prevent damage such as cracks and chips to the fired product as much as possible.

[Structure of the Invention (Means for Solving the Problems) The method for firing a long product made of silicon carbide of the present invention includes disposing a long cover plate made of a refractory material so as to cover the inner wall of the matsufuru, The feature is that the items are stored along the cover plate.

(Function) According to the above method, the product to be fired placed on the inner wall side of the Matsufuru is not supported by directly contacting the inner wall of the Matsufuru, but comes into contact with the cover plate and is supported via this. Become. As a result, the product to be fired can be supported in a line contact state along the vertical direction of the matsufuru, which prevents local forces from acting on the product to be fired and prevents damage to the product as much as possible. .

In addition, as a temporary cover, it is suitable to use a material made of carbon or silicon carbide that has good thermal conductivity, is resistant to thermal shock, can withstand use at sufficiently high temperatures, and is not reactive with silicon carbide. There is.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

These FIGS. 1 to 3 show the state in which the product to be fired 2 is housed in the matsufuru 11. As shown in FIG. 2, the Matsuful 11 has a circular bottom plate 13 made of carbon, for example.
On top of this, cylindrical divided tube bodies 14 also made of carbon are stacked in multiple stages to form a bottomed cylindrical shape with a vertically long accommodation cavity 11a. In this case, as shown in FIG. 3, recesses 13a (see FIG. 2) and 14a are formed on the entire outer periphery of the upper surface of the bottom plate 13 and each divided cylinder 14, and each divided cylinder 14 There is a protrusion 1 on the entire outer periphery of the bottom surface of the
4b is formed, and these recesses 14a or 13a
The convex portions 14b are fitted into the stacks so that they can be stacked. In addition, the height dimension of the Matsufuru 11, that is, the number of stacked divided cylinder bodies 14 is determined by the number of stacked pieces of the divided cylinders 14.
It is set to fit perfectly within the On the other hand, the accommodation cavity 11 of this Matsuful 11. The article to be fired]-2 housed in a is made of silicon carbide material and has a length of, for example, 2 m.

It is shaped like a round pipe with a diameter of 401 mm. 15°16
is a partition lid made of carbon, which has a semicircular thin plate shape and is supported on the upper part of the inner wall of the matsufuru 11. 17 is a presser brick made of carbon, which is used by being placed on the upper surface of the partition fl16;
Matsuful 1 of the product to be fired 12 along with the partition lid 15 and 16
This serves to prevent movement in the lateral direction when the container is housed in the container.

Now, 18 is a cover plate made of refractory material, for example, silicon carbide, ]9
is a partition plate made of silicon carbide, and both the cover plate 8 and one partition plate are formed into elongated plate shapes having substantially the same length as the product 12 to be fired. As shown in FIG. 1, the cover plate 8 is formed in a gentle arc shape in the width direction so that the plate surface is in surface contact with the inner wall surface of the pine full 11.

Next, a procedure for firing the article 12 to be fired will be explained.

First, outside the kiln (not shown), the work of storing the fired product 12 into the Matsufuru 11 is performed as follows.

That is, as described above, the divided cylinders 14 are stacked up to form a matsuful]
], and - number of partition lids 15 are arranged.

Next, the partition plates 19 are vertically arranged along the edge part (the part forming the chord of a semicircle) of the partition lid 15 and with one edge in contact with the inner wall of the matsufuru 11. Then, the inclination of the partition plate 19 and the position of the cover plate 18 are adjusted so that one side edge of the cover plate 18 touches the partition plate 19, and one cover plate 18 is arranged along the inner wall of the Matsuful 11. do. Hereinafter, starting from this cover plate 18, a plurality of cover plates 18
Arrange them one after another so that their side edges touch each other and
cover the inner walls of the Also, if you cover it like this,
At the same time, the fired product 12 is stored upright in the storage cavity 11a. To store the product 12 to be fired, first, the product to be fired 2 located at the uppermost end in FIG.
and the required number of fired products 12 are arranged so as to be in contact with and supported by the partition plate 19, and from that fired product 12 as a starting point, the required number of fired products 12 are
The products to be fired 12 are arranged in order so that they support each other, and the products to be fired 12 located on the outer periphery side are aligned along the cover plate 18 as shown in FIG. Further, on the partition lid 15 side, a plurality of partition plates are arranged side by side so as to support the product 12 to be fired, so that the entire product 12 to be fired is covered by the cover plate 1.
8 and a partition plate 19. Finally, place the second partition M16 on the partition lid 15 so that its edge portion contacts the partition plate 19 and supports it, and also so as to support the one partition plate that is not supported by the partition lid 15 and 16. A presser brick 17 is placed on the partition lid 16. Thereby, as shown in FIGS. 1 and 2, the storage of the product to be fired 2 into the matsufuru 1 is completed.

Thereafter, this Matsufuru 11 is escorted by, for example, a hand lift and placed in a kiln, and the product to be fired 12 is placed in an inert gas atmosphere such as argon gas inside the Matsufuru 1.
is heated and the pipe is fired.

According to this embodiment, among the products 12 to be fired, those located on the outer peripheral side of the accommodation cavity 11a of the Matsufuru 11 are
Instead of being supported by direct contact with the inner wall of the matsufuru 11, it comes into contact with and is supported through the cover plate 18, which has a flat plate surface. Therefore, as shown in FIG. 3, even if there is a difference in the inner wall of the matsufuru 11 due to a misalignment at the seam of the divided cylinders 14, the product 12 to be fired will not come into contact with the product 12 at several points as in the conventional method. Instead of being supported by a line that extends in the vertical direction, it may be supported in a line contact state that extends in the vertical direction. As a result, even if the matsufuru 11 is tilted or vibrates during fine feeding, it is possible to prevent local forces from acting on the fired product 12 as in the prior art. In this way, even if the unfired product 12 to be fired is brittle, damage such as cracks, chips, etc. of the product 12 to be fired housed in the matsufuru 1 can be prevented as much as possible.

In addition, especially in this embodiment, one partition plate is arranged in addition to the cover plate 18 so that the entire article 12 to be fired is surrounded by these plates, so that the article 12 to be fired can be separated from the partition lid 15, 16 and the presser brick 17. There is no local contact between the two, and the same effect of preventing damage as described above can be obtained.

In the above embodiment, both the cover plate 18 and the partition plate 19 are made of silicon carbide, but they may be made of carbon.

Further, there is no need to distinguish between the cover plate 18 and the partition plate 19, and it is preferable to use the arc-shaped plate as the cover plate and the flat plate-shaped plate as the partition plate, as described above. If desired, the same may be used for both the cover plate and the divider plate.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications may be made without departing from the scope of the invention, for example, the article to be fired is not limited to a round vibrator, but may also be a square vibrator or a rod. is possible.

[Effects of the Invention] As is clear from the above explanation, according to the method for firing a long product made of silicon carbide of the present invention, a long cover plate made of a refractory material is arranged to cover the inner wall of the matsufuru. Since the products to be fired are housed along the cover plate, no local force is applied to the products to be fired, and damage such as cracks and chips to the products to be fired can be prevented as much as possible. It has the excellent effect of being able to

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a plan view showing a state in which a product to be fired is accommodated in a matzuru, Figure 2 is a longitudinal sectional front view of the same, and Figure 3 is an enlarged longitudinal sectional front view of the main part, and FIGS. 4 to 6 are respectively the first
FIG. 3 is a diagram corresponding to FIGS. In the drawing, 11 is a matsufuru, 11.2 is a storage cavity, 12 is a product to be fired, 14 is a divided cylinder, 1.5.16 is a partition lid, 1
8 indicates a m-thick plate, and 19 indicates a partition plate.

Claims (1)

[Claims] 1. Multiple refractory divided cylinders are stacked in multiple stages to form a muffle with a vertically long storage cavity, and a large number of long silicon carbide products to be fired are placed in the storage cavity to support each other. In this method, the items to be fired are fired by storing them side by side in a kiln, in which a long cover plate made of refractory material is arranged to cover the inner wall of the muffle, and the items to be fired are placed in a kiln. A method for firing a long product made of silicon carbide, characterized in that the product is housed along the cover plate.