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Coating Material For Platinum Material, Platinum Material Coated With Such Coating Material, And Glass Manufacturing Apparatus

a technology of coating material and platinum material, which is applied in the field of coating material for platinum material, platinum material coated with such coating material, glass manufacturing apparatus, etc., can solve the problems of not showing the tendency to melt or deform, the coating material is simply high in strength, and the components experience thermal expansion or shrinkage, etc., to achieve the effect of superior high-temperature properties of platinum material, avoiding vaporization loss of platinum, and suppressing bubble formation

Inactive Publication Date: 2008-04-17
TANAKA PRECIOUS METAL IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a coating material for a platinum material used in high-temperature environments that can withstand bubble formation caused by water in a glass during manufacturing. The coating material contains a refractory material component containing alumina and silica, and a glass component. The coating material is in a slurry form and can be applied onto the surface of the platinum material using spraying or other methods. The slurry contains methylcellulose or other water-soluble polymer as an organic binder. The coating material can effectively suppress bubble formation and reduce vaporization loss of platinum from the substrate.

Problems solved by technology

First, it does not show the tendency to melt or deform in a high-temperature environment and needs to have a sufficient degree of flexibility to follow deformation of the platinum material as a substrate.
When the apparatus is operated or brought to rest, its components experience thermal expansion or shrinkage.
Accordingly, the coating material if simply high in strength, i.e., rigid, tends to break as a result of failure to follow their dimensional change.
This causes them to deform and lose their functions.
This is because the presence of such defect leads to damaging of the coating material during use and causes the substrate to contact with an outside air, resulting in the failure to sufficiently reduce a vaporization loss of platinum from the substrate.
However, they are hard to form a dense film by firing, because of their low flexibility and high melting points, and accordingly does not show the performance contemplated by the present invention.

Method used

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  • Coating Material For Platinum Material, Platinum Material Coated With Such Coating Material, And Glass Manufacturing Apparatus
  • Coating Material For Platinum Material, Platinum Material Coated With Such Coating Material, And Glass Manufacturing Apparatus
  • Coating Material For Platinum Material, Platinum Material Coated With Such Coating Material, And Glass Manufacturing Apparatus

Examples

Experimental program
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Effect test

example 5

[0081] This Example conforms to the fourth embodiment of the present invention.

[0082] In this Example, a coating material (fired coating material) having a two-layer structure was manufactured. First, a raw material sol (slurry) containing alumina and silica (53.1% by weight of alumina and 46.9% by weight of silica) was coated onto a substrate. The same solvent and preparation method were used as in Examples 1-4. Only loadings thereof were adjusted. As similar to Examples 1-4, the raw material sol was spray coated. The coated sol was dried and then fired to form a first coating layer (150 μm thick).

[0083] Thereafter, a second coating layer was formed on the first coating layer. This second coating layer was made of a glass component layer containing 50% by weight of an OA-10 glass component and 50% by weight of an EF glass component. In the forming process of the second coating layer, the sol was spray coated to a film thickness of 150 μm, as described above.

[0084] The resulting ...

examples 7-9

[0096] These Examples conform to the first embodiment of the present invention.

[0097] Slurry solutions of Examples 7-9 were prepared having the compositions specified in Table 4. The same types of glass component, Al2O3 and SiO2 as used in Example 6 were used.

[0098] [Application of Coating Material to Platinum Crucible]

[0099] While an interior surface of a sand-blasted platinum crucible (46 mm in diameter and 40 mm in height) was heated by a hot air gun, each slurry was spray coated on exterior bottom and side surfaces of the platinum crucible, as similar to Example 6. Coating was achieved such that the coating layer after fired formed a 500 μm thick film. The coated slurry was dried at 80° C. to form a slurry coating material layer.

[0100] The platinum crucible on which the slurry coating layer was formed in the manner as described above was then fired at a test temperature for 5 hours, cooled to a temperature 200° C. lower than the test temperature, filled with an aluminoborosil...

example 10

[0103] This Example uses a paste-form coating material in accordance with the second embodiment of the present invention.

[0104] A mixture containing 37.5% by weight of a glass component (OA-10), 39.0% by weight of alumina (Al2O3) particles and 23.5% by weight of silica (SiO2) particles, as shown in Table 5, was first sintered to provide a sintered body. The silica particles had a mean particle diameter of 20 μm. The alumina particles were the same particles as used in Example 6. Sintering was performed at 1,500° C. for 24 hours. The obtained sintered body was ground to provide a ground product having a mean particle diameter of about 20 μm.

[0105] 100 parts by weight of the ground product obtained and parts by weight of alumina fibers (97 wt. % Al2O3-3 wt. % SiO2, mean fiber length=10 mm, mean fiber diameter=3 μm) were added to an aqueous solution containing a methylcellulose resin dissolved therein at a concentration of 9% by weight. The resultant was mixed to prepare a paste. The...

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Abstract

Disclosed is a material for coating the surface of a platinum material made of platinum or an platinum alloy. Specifically disclosed is a coating material for platinum materials which contains a fire-resistant material component including alumina and silica, and a glass component.

Description

TECHNICAL FIELD [0001] The present invention relates to a coating material for covering a platinum material for use in a high-temperature environment, such as in a glass manufacturing apparatus. BACKGROUND ART [0002] An apparatus (including stir chamber, melter, refiner and others) for manufacture of high-quality glasses such as optical glass and display glass generally uses a platinum material as its constituent material. The platinum material is used as the constituent material for such chambers and vessels because of the following. Platinum has a high melting point and forms no oxide layers in the air, so that the platinum material is little subjected to degradation, deformation and damage during operation of such an apparatus. In addition, it is superior in chemical stability and shows a low tendency to contaminate glass in a molten state. Other than platinum, platinum alloys such as a platinum-rhodium alloy have been widely used for the platinum material (other platinum materia...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C26/00
CPCC23C24/00C03B5/1672C23C26/00
Inventor SHOJI, TORUKATO, MITSUOHIYAMA, MIKIOTAKAYA, TATSUYAAITOKU, TAKASHI
Owner TANAKA PRECIOUS METAL IND
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