JPS589774B2 - Hot glass outflow gutter - Google Patents

Description

[Detailed description of the invention] The present invention relates to hot glass outflow troughs.

More particularly, the present invention relates to an improved high temperature glass outflow trough coated with carbide cermet.

Conventionally, readily available iron troughs have been used to drain high-temperature heat-softening materials such as molten glass substrates.

For example, when repairing a glass melting furnace, it is necessary to take out the molten glass in the glass melting furnace while it is still molten, and when spinning glass fibers has to be interrupted for some reason, the molten glass must be removed. It is necessary to solve the problem without stopping the supply of molten glass, and therefore iron gutters have been used as a means to remove the continuously supplied molten glass.

However, when using such iron gutters,
In order to ensure smooth outflow of glass, it was necessary to increase the angle of inclination of the gutter, and it was also necessary to continuously supply an extremely large amount of water to the gutter.

Therefore, in addition to requiring a large amount of water, there were disadvantages in that water was scattered around and an extremely large amount of water vapor was generated.

In particular, when trouble occurs during glass fiber spinning, the spinning equipment does not like heat and the various equipment is compactly installed, so the use of large amounts of water, water scattering, and generation of large amounts of steam can be avoided compared to conventional steel spinning equipment. This was a decisive drawback when using gutters.

Therefore, the inventor proposed that instead of iron gutters, which require the use of large amounts of water and therefore have the various disadvantages associated therewith, which have these disadvantages, iron gutters have these disadvantages.
We conducted research to develop a gutter that can be used to smoothly take out high-temperature glass such as molten glass, and discovered that good results could be obtained by using a gutter coated with carbide cermet, which we previously proposed. .

The inventor of the present invention continued his research and developed a high-temperature glass outflow gutter that allows glass to be taken out more smoothly than the previous proposal, resulting in the present invention.

The present invention encompasses improvements over the inventor's previous proposals.

That is, the present invention provides a metal plate on which the surface through which the high-temperature glass passes has a thermal conductivity at 20°C of at least 70 Kca1/m-h·°C and has substantially no reactivity with water. , a high-temperature glass outflow gutter for allowing high-temperature glass to flow out while supplying water onto the surface, characterized in that it consists of a covering plate coated with carbide cermet.

In the present invention, a cermet is generally referred to as a heterogeneous mixture of a metal or an alloy and one or more ceramic phases, and a carbide cermet is one in which the ceramic phase is a carbide.

Examples of carbide cermets include WC-Ni, Tic-Ni, Cr3C
2-nickel graphite cermet such as Ni, W
Cobalt graphite cermets such as C-co and TiC-co are preferably used.

Among these, nickel graphite cermets are particularly preferably used.

These carbide cermets are readily available and the methods for making them are well known.

The gutter of the present invention is a gutter having these carbide cermets as a coating layer, and the metal to which such a coating layer is provided has a thermal conductivity of at least 70 Kcal at 20°C.
/m-h・℃.

Typical examples of such metals include pure metals such as copper and aluminum, and alloys of copper and aluminum such as brass, duralumin, and silumin, which are industrially easily available and preferred.

The formation of these coating layers involves applying the above-mentioned carbide cermet powder (for example, about 30 to 50μ) to the metal to be coated.
It can be manufactured by spraying and sintering with high-temperature gas (to form a coating layer with a thickness of about 100 to about 300 μm), but generally after forming the metal into the shape of a gutter, the above-mentioned method is applied. It is preferable to use a method of forming a covering layer.

The shape of the gutter of the present invention is not particularly limited, and examples include those having a so-called V-shape, U-shape, or ■-shape in cross section.

However, the entire surface of the gutter of the present invention does not necessarily need to be coated with carbide cermet.

What is required is that at least the surface through which the glass passes during use is coated with the above-mentioned cermet.

According to the research conducted by the present inventors, it has become clear that the above-mentioned carbide cermets, particularly nickel graphite cermets, have particularly excellent frictional lubricity with high-temperature glass, especially molten glass substrates.

Furthermore, since these cermets generally exhibit the property of sintering without melting, the surface of the coating layer produced as described above generally has small irregularities.

As will be explained in detail below, it has been found that the gutter of the present invention having such a small uneven surface is extremely advantageous in taking out high-temperature glass.

When the gutter of the present invention is used for taking out glass, it is advantageous to supply water to the surface of the gutter, although only in a small amount, and to cool it from the bottom.

The amount of water supplied to the surface of the gutter is sufficient, for example, to the extent that the surface of the gutter is clearly wet with water.

In particular, when the coated surface has small irregularities, water enters the recesses, and the water in the recesses turns into water vapor and lifts the glass, so that the glass moves smoothly.

Of course, as the inventor proposed earlier, the movement of the glass depends on the glass supply speed, the installation angle and form of the gutter, etc., but subsequent research shows that it is possible to cool the glass receiving surface from below. It was revealed that the movement of the glass proceeded extremely smoothly.

In other words, until now it was believed that the movement of the glass was substantially achieved by the water present in the recesses turning into water vapor and lifting the glass, and also by the poor wetting of the glass with the cermet layer on the surface. The above-mentioned performance exhibited by the inventive gutter was truly surprising to the inventor.

Since the gutter of the present invention is used while cooling from the bottom surface and supplying water to the surface, the metal plate (approximately 2 to 3 The metal material (thickness of the door) must have good thermal conductivity, with a thermal conductivity of at least 70 Kcal/m·h·°C at 20°C.

When the molten glass substrate is taken out using the gutter of the present invention while supplying a small amount of water, the molten glass does not form into large lumps, but is broken into small pieces, and is generally collected as granules that roll down on the gutter. I can do it.

Below, the performance of the gutter of the present invention will be specifically explained by describing an experimental example in which a molten glass substrate was taken out using the gutter of the present invention.

EXPERIMENTAL EXAMPLE A metal plate (thickness 3 mm) made of the material listed in Table 1 was coated with a thermally sprayed coating layer of WC-Ni of approximately 150 μm in length. Groove angle 90
We used a gutter with a

This gutter is constructed such that the WC-Ni thermal spray coating layer surface is the upper surface, that is, the surface that receives the molten glass base, and the metal plate surface is the lower surface, that is, the surface that is water-cooled.

The molten glass substrate at a temperature of 1,100 to 1,150°C was poured into this gutter at a temperature of 1,100 to 1,150°C while cooling the lower metal plate surface with water and injecting water onto the upper thermal spray coating layer surface at a rate of about 1,200 ml/min.
It was fed at a rate of 0 kg/h.

The installation angle of the gutter was 27 degrees with respect to the horizontal plane.

The results are shown in Table 1.

In addition, an experiment was conducted under the same conditions as above using a gutter in which the receiving surface of the molten glass substrate was a copper plate without a cermet spray coating surface layer.

The results are shown in Table 2.

Using the gutter of the present invention used in the experiments No. 1 and 2 above, the experiment was carried out in exactly the same manner as above except that the installation angle of the gutter was 20 degrees, and the results were almost as shown in the above experimental results. Similarly, the glass could be made to flow down continuously at a nearly constant speed, and the glass could be recovered as granules.

Further, an experiment was conducted in exactly the same manner as above using the gutter of the present invention, which was made of the same material as used in the experiments of experiment numbers 1 and 2 above, but whose side groove angle was 60 degrees.

In this case as well, no difference was observed between the results and the case of a gutter with a groove angle of 90 degrees.

In addition, it was confirmed through the same experiment as above that the outflow of glass on the gutter generally tends to become less smooth as the amount of molten glass supplied to the gutter decreases.
According to the gutter of the present invention, it has been shown that even at a low supply rate of about 15 kg/h, it is possible to ensure a sufficiently smooth outflow of glass with a water supply of about 100 TIL/min.

Then, the supply amount of glass is reduced to less than this, for example, about 1
In the case of approximately 0 kg/h, the glass could still be smoothly collected by supplying water at, for example, 150 ml/min.

Disadvantages of a gutter in which, unlike the gutter of the present invention, the glass forms an intermittent stream over the gutter, as seen for example in Experiments 3 and 4 above, especially in Experiment 4, and the glass thus collected is large granules or lumps. The problem is not only that the glass cannot be collected continuously, but also that it can become clogged in the cylindrical chute through which it typically passes after passing through the gutter until it is collected.

Claims (1)

[Claims] 1. The surface through which the high-temperature glass passes has at least 70 Kcal.
A metal plate having a thermal conductivity of /m·h·°C at 20°C and having substantially no reactivity with water is coated with a carbide cermet. A hot glass outflow gutter for allowing hot glass to flow out while supplying water onto the surface. 2. The outflow gutter according to claim 1, wherein the carbide cermet is a nickel graphite cermet.