JPH01230451A - Electrically conductive crystallized glass - Google Patents

Abstract

PURPOSE:To provide crystallized glass with electrical conductivity without damaging color tone, pattern, gloss, etc., of crystallized glass and to prevent or reduce adhesion of dust, etc., by static electricity, by forming a transparent electrically conductive film with tin oxide. CONSTITUTION:Crystallized glass is optionally abraded and adjusted to surface state of 1-10mu roughness and brought into contact with vapor of a tin compound such as SnCl2 in a state of being heated at 450-800 deg.C to form a transparent electrically conductive film which has preferably 0.1-0.5mu, thickness and consists of tin oxide (SnO2).

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to the provision of crystallized glass having electrical conductivity.

(Conventional technology and issues) Crystallized glass has excellent strength, wear resistance, and corrosion resistance, as well as
Due to its beauty, cleanliness, and luxury, it is used as an interior and exterior material for buildings.
It is also used for clean room components and the tops of laboratory tables and work tables.

By the way, the adhesion of dust and suspended substances due to static electricity to the above-mentioned components not only impairs their characteristic beauty, cleanliness, and sense of luxury, but also makes them particularly difficult to remove as building materials. When used over a wide area or at high places, it is not easy to remove deposits.

Based on the above-mentioned circumstances, the present invention provides conductivity to the surface of crystallized glass without impairing its color tone, pattern, luster, etc., and prevents the adhesion of dust and other static electricity. This was done for the purpose of providing crystallized glass that can be easily removed even if it adheres.

(Means for Solving the Problems) In the conductive crystallized glass of the present invention, which has been made to achieve the above object, it is a feature of the invention that a transparent conductive film made of tin oxide is formed on the surface of the crystallized glass. That is.

(Function) Tin oxide has electrical conductivity and can maintain sufficient transparency when formed into a film with an appropriate thickness. The present invention forms a tin oxide film that maintains such transparency on the surface of crystallized glass, and because of its transparency, it does not impair the color tone, pattern, gloss, etc. of crystallized glass, and also improves its conductivity. Therefore,
Even if charged dust or the like adheres, the charge is lost to prevent adhesion due to static electricity, and even if it adheres, it can be easily removed.

(Example) A wide range of crystallized glasses can be used as the crystallized glass used in the present invention, regardless of its manufacturing method or precipitated crystals, and regardless of whether it is colored or has a pattern. In forming the conductive film on the surface, first, the surface condition is adjusted by polishing.

That is, it is necessary to have a roughness that does not impair the color tone, gloss, pattern, etc. of the crystallized glass and maintains the adhesion and transparency of the conductive film, and a suitable roughness for this purpose is 10 μm or less. This is because the gloss deteriorates when the roughness exceeds 10 μm.

Note that setting the roughness to less than 1 μm poses a problem in terms of polishing cost. Therefore, the desirable roughness range is 1 to 10 μm.

In order to form a conductive film on the crystallized glass whose surface has been adjusted as described above, the crystallized glass is heated to 450 to 800°C and then (CHi) zsnc I! , 2, and by the same contact (C1l 3) z
snc I! , 2 is thermally decomposed to form a transparent conductive film containing tin oxide (SnO□) as a main component on the surface of the crystallized glass.

Note that the film thickness at this time is preferably 0.1 to 0.5 μm. If the thickness is less than 0.1 μm, the conductivity is insufficient, and if it exceeds 0.5 μm, the transparency deteriorates and it is not economical.

Next, specific examples of the present invention will be described.

First, let's talk about the crystallized glass used. The glass is a powder of low softening point glass A and high softening point glass B having the composition shown in Table 1 below, both of which have a particle size composition in which 97% of the particles are 200 mesosinus or less. After that, mix both at 1=1,
Next, hot press forming was performed at 600°C15C'kgf/cJ to obtain a plate-shaped material, and then the same material was pressed at 900°(:X4H
Sintered and crystallized by heat treatment of r, mainly SiO
□This is a crystallized glass plate material from which the product was deposited.

(Next page) Table 1 (Unit: wt%) Here, I would like to mention the mixed use of low/high softening point glass powder and the non-use of fine powder.When hot press molding, a mixture of low/high softening point glass powder is used. Low softening point glass powder acts as a binder to facilitate molding and sintering.
The high softening point glass powder prevents wall warping during crystallization, and since it is a fine powder, it is easy to transfer components between different powders during heat treatment. Precipitation becomes easier and increases.

Now, after polishing the surface of the plate material manufactured as described above to obtain a product having a glossy surface with a surface roughness of 1 to 10 μm, the product was heated to 450 to 500°C, and the surface was converted to (CH3).
A transparent conductive film containing tin oxide (SnO□) as a main component was formed on the glass surface by contacting with a mixed gas of zsnc j2 g of steam and air to obtain a conductive crystallized glass plate product.

When we measured the electrical resistance on the coating surface of the above product, we found that
Electrical resistance values of 20-50 Ω/ci were obtained. In addition, when observing the appearance, the color tone and gloss of the crystallized glass were impaired, and when the thickness of the coating was investigated, it was found to be 0.2 to 0.3 μm.

(Effect of the invention) As explained above, the conductive crystallized glass of the present invention has
Since a transparent conductive film made of tin oxide is formed on the surface of crystallized glass, it does not impair the color tone, pattern, gloss, etc. of the crystallized glass, and the conductivity imparted by the conductive film is due to static electricity. This prevents and reduces the adhesion of dust, etc., and makes it easy to remove any adhesion.

Furthermore, the electrical conductivity also produces a radio wave shielding effect, and therefore, the electrically conductive crystallized glass of the present invention can be used as a building exterior wall material for radio wave shielding, for example, and the industrial value of the present invention is It is significant.

Patent applicant: Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] (1) A conductive crystallized glass, characterized in that a transparent conductive film made of tin oxide is formed on the surface of the crystallized glass.