JPS62178883A - Continuous high-temperature sintering furnace with reflector - 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] (Industrial application field) The present invention relates to a continuous high temperature sintering furnace.

(Prior art) As shown in Fig. 3, a conventional continuous sintering furnace has a heating element 5' inside a furnace wall 1' made of refractory bricks such as high-purity alumina bricks, and is inserted through an insertion port (not shown). The sintered object 7' is sintered and taken out from an outlet (not shown).

(Problems to be Solved by the Invention) However, in this conventional continuous sintering furnace, the maximum operating temperature of the refractory bricks (high-purity alumina bricks) forming the furnace wall 1' is 1850°C, and if the temperature exceeds that temperature, Because the refractory bricks melt and become unusable.

Sintering at temperatures above 1850°C was not possible.

In addition, as shown in FIG. 4, which can be used at high temperatures of 1850 DEG C. or higher, a reflecting plate 4' is provided inside the furnace wall 1', and a heating element 5' is provided inside the reflecting plate 4'.

A punch and half-bell type sintering furnace in which cooling water 9 is circulated around the outer circumference of the furnace wall 1' is also known, but in this sintering furnace, the insertion and removal of the sintered material 7' is performed by a patch method. Therefore, the productivity is low, the furnace must be opened every time sintering is performed, and the furnace must be cooled from the outside, resulting in poor energy efficiency and the amount of cooling water 9 used.

In addition, it required additional equipment such as a water supply device, which was not satisfactory as an industrial furnace.

The present invention was made in view of the above problems.

It is an object of the present invention to provide a continuous high-temperature sintering furnace that can be used even at high temperatures of 1850° C. or higher and is industrially practical and has good thermal efficiency.

(Means for Solving the Problems) The present invention provides an insertion port 2 and an output port 3 on two opposing sides of a sintering furnace in which a heating element 5 is provided inside a furnace wall 1 made of firebrick. A reflector plate 4 such as a molybdenum plate is provided inside the furnace wall 1 of a continuous sintering furnace in which a material to be sintered 7 inserted through an insertion port 2 is sintered and taken out from an output port 3. In addition to providing the body 5, a receiving plate 6 made of a material such as molybdenum material that is more resistant to high temperatures than firebrick is provided at the bottom of the sintering furnace over the entire length of the furnace.

(Example) Hereinafter, nine embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a furnace wall made of refractory bricks such as high-purity alumina bricks, and an insertion port 2 and an output port 3 are formed on two opposing sides of the furnace wall 1.

Reference numeral 4 denotes a reflection plate formed of a molybdenum plate with a thickness of about 0.5 mm, which is provided on the inner surface of the furnace wall 1, and 5 is a heating element provided inside the reflection plate 4, which is made of a tungsten wire with a diameter of about 1.5 mm. It is formed of.

Reference numeral 6 denotes a receiving plate provided at the bottom of the sintering furnace over the entire length of the furnace, and is made of a material more resistant to high temperatures than firebrick (furnace wall) such as molybdenum material.

7 is an object to be sintered, and 8 is a cooling section provided outside the outlet 3 of the sintering furnace.

The present invention has the above-mentioned configuration, and the 9 heating elements 5 each have a power of about 30 k.
Apply W power, width 50 mm x height 50 mm x length 100 mm
When the object to be sintered was sintered, a sintering temperature of 2000°C could be obtained.

(Effect of the invention) According to the present invention, a continuous sintering furnace is provided with a reflective plate.

Since the heat from the heating element is reflected to the center of the furnace, even if the temperature of the furnace core (sintering temperature) becomes high, the temperature of the furnace wall can be lowered. 185
This is because things that could only be heated up to 0°C can now be heated to higher temperatures.

Continuous sintering at high temperatures of 1850°C or higher has become possible.

In addition, the receiving plate on which the object to be sintered is placed is made of a material that has higher high temperature resistance than the furnace wall to withstand the sintering temperature, so the receiving plate will not melt due to high-temperature sintering. In addition, since the refractory bricks and the like can be used in almost the same way as in conventional continuous sintering furnaces, there is little cost increase, and it has the effect of making it possible to obtain an industrially practical continuous high-temperature sintering furnace at low cost. .

[Brief explanation of drawings]

1 and 2 are schematic diagrams of a continuous high-temperature sintering furnace of the present invention, with FIG. 1 being a side sectional view and FIG. 2 being a front sectional view. FIG. 3 is a side sectional view of a conventional continuous sintering furnace, and FIG. 4 is a side sectional view of a patch half-bell type sintering furnace. 1... Furnace wall, 2... Insertion port, 3... Removal 0.4.
...Reflector plate, 5...Heating element, 6...Receiving plate, 7...
Object to be sintered. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1) A heating element (
5) is provided with an insertion port (2) and an ejection port (3) on two opposing sides of the sintering furnace, and the object to be sintered (7) inserted through the insertion port (2) is sintered and then removed from the ejection port. In the continuous sintering furnace taken out from (3), a reflector plate (4) is installed inside the furnace wall (1), a heating element (5) is installed inside it, and the bottom of the sintering furnace is installed along the entire length of the furnace. A continuous high-temperature sintering furnace having a reflector plate, characterized in that it is provided with a receiving plate (6) made of a material more resistant to high temperatures than refractory bricks. 2) A continuous high-temperature sintering furnace having a reflector according to claim 1, wherein the reflector (4) and the receiving plate (6) are made of molybdenum material.