JPS5837256B2 - Hot glass outflow gutter - Google Patents

Description

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

More specifically, the present invention relates to a high-temperature heat-softening substance outflow gutter coated with carbide cermet or nitride cermet.

Conventionally, easily 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 inside the glass melting furnace, or when spinning glass fibers has to be interrupted for some reason. It is necessary to solve the problem without stopping the supply of molten glass, and for this reason iron gutters have been used as a means to remove the continuously co-supplied molten glass.

However, when using such iron gutters,
In order to ensure smooth flow 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, spinning equipment does not like heat and various equipment is installed compactly, so the use of large amounts of water, water scattering, and generation of large amounts of water vapor are difficult to solve compared to conventional steel spinning equipment. This was a decisive drawback when using gutters.

Therefore, instead of iron gutters which require the use of a large amount of water and therefore have the various disadvantages mentioned above, the inventors have proposed a method which does not have these disadvantages of iron gutters.
As a result of continuing research to develop a gutter that can be used to smoothly take out high-temperature glass such as molten glass, it has been found that when using a gutter coated with carbide cermet or nitride cermet, the above-mentioned drawbacks of iron gutter are avoided. We have found a scale that can solve all problems and allow the high-temperature glass to flow out smoothly, and have arrived at the present invention.

That is, the present invention provides a high-temperature glass outflow gutter characterized in that the surface on which the high-temperature glass flows is made of a coating plate made of a metal plate of iron or stainless steel coated with carbide cermet or nitride cermet. It is.

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

? Examples of compound cermets include WC-Ni, T
Nickel graphite cermets such as iC-Ni and Cr3C2-Ni, cobalt graphite cermets such as WC CosTiCC are preferably used,
In addition, examples of nitride cermets include boron nitride (BN)-based cermets such as BN-N i , BN-
Co or the like is preferably used.

Among these, nickel graphite-based cermets and boron nitride-based cermets are particularly preferably used.

These carbide cermets and nitride cermets are readily available, and their manufacturing methods are well known.

The gutter of the present invention is a gutter having these carbide thermots or nitride cermets as a coating layer, and a coating plate made by coating an iron or stainless steel metal plate with these cermets forms the surface through which high-temperature glass passes. ing.

These coating layers can be formed by spraying and sintering the carbide cermet or nitride cermet powder (for example, about 30 to 50μ) on the metal to be coated using high-temperature gas. It is preferable to form the metal into the shape of a gutter and then form a coating layer thereon by the method described above.

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 gutter of the present invention does not necessarily need to have its entire surface coated with carbide cermet or nitride cermet, but it is sufficient that at least the surface through which high-temperature glass passes during use is coated.

According to the research conducted by the present inventors, it is clear that the above-mentioned carbide cermets or nitride cermets, especially nickel graphite cermets and boron nitride cermets, have excellent frictional lubricity with high-temperature glass, especially molten glass substrates. Na two ta.

1. Since the cermet of υ et al. generally exhibits the property of sintering without melting, the surface of the coating layer produced as described above generally has small irregularities, but as explained below, this It has also become clear that a gutter having a coating layer with such a small uneven surface is extremely advantageous for taking out high-temperature glass.

When the gutter of the present invention is used to take out high-temperature glass, it is advantageous to use it while supplying water, although only a small amount is required.

For example, the amount of water is enough to make it clear that the surface of the gutter is wet.

In particular, when the coated surface has small irregularities, water enters the recesses, and the water in the recesses turns into water vapor and acts to lift the high-temperature glass, so that the high-temperature glass moves smoothly.

Of course, it depends on the supply speed of high-temperature glass, the installation angle and form of the gutter, etc., but when the molten glass substrate is taken out while supplying a small amount of water using the gutter of the present invention with a V-shaped cross section, It has become clear that molten glass does not form into large lumps but into small pieces, and in some cases can be recovered as granules or cut rods that roll down the gutter, while still being partially softened.

Furthermore, when the molten glass substrate was taken out in the same manner as above using the rectangular gutter of the present invention, it was recovered as a solidified plate, but in this case as well, the sliding on the gutter was extremely smooth. Met.

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 molten glass base at a temperature of 1186°C to 1210°C was heated at the feeding rate shown in Table 1 in the form of
80crrL long gutter with side groove angle 90@) and 40μ thick WC-Ni spray coating layer (substrate material is iron)
The cycle, weight, and temperature of the glass were measured as it was supplied and dropped.

The results are shown in Table 1.

In Table 1, experiment numbers 1 to 6 are experiments conducted without pouring water into the gutter, and experiment number 7 is an experiment conducted with a small amount of water poured onto the gutter (
This experiment was carried out (approx. 50 ml, 7 min).

As is clear from the results in Table 1 above, the gutter coated with the carbide cermet or nitride cermet of the present invention is capable of smoothly dropping high-temperature glass without supplying any water to the gutter; When supplying water to the gutter,
It can be seen that even by tilting the gutter installation angle (angle of inclination with respect to the horizontal plane) by only 15 degrees, superior performance can be achieved in allowing the glass substrate to fall continuously as granules.

Claims (1)

[Scope of Claims] 1. A gutter for outflowing high-temperature glass, characterized in that the surface through which the high-temperature glass passes consists of a coating plate made of a metal plate of iron or stainless steel coated with carbide cermet or nitride cermet. 2. The outflow gutter according to claim 1, wherein the carbide cermet is a nickel graphite cermet. 3. The outflow gutter according to claim 1, wherein the nitride cermet is a boron nitride cermet.