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Reduction of pt and rh evaporation losses at high temperatures by using a barrier layer

A technology of evaporation loss and ceramic layer, which is applied in the direction of glass manufacturing equipment, glass furnace equipment, feeding trough, etc., can solve the problems of scrapped parts, reduced amount of precious metals, and reduced firmness of parts, etc., and achieves reduced equipment size and short passage Time, purification and efficient effect

Inactive Publication Date: 2013-06-19
HERAEUS MATERIALS TECHNOLOGY GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause a reduction in the robustness of the part, which can lead to premature scrapping of the part
In addition, the amount of precious metals that can be reused directly after scrapping the parts is reduced, which causes additional costs

Method used

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  • Reduction of pt and rh evaporation losses at high temperatures by using a barrier layer
  • Reduction of pt and rh evaporation losses at high temperatures by using a barrier layer
  • Reduction of pt and rh evaporation losses at high temperatures by using a barrier layer

Examples

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Effect test

Embodiment 1

[0044] exist figure 2 The device shown in cross-section in , shows a glass guide tube wrapped by ceramic fiber or powder and ceramic compact, which is different from the prior art ( figure 1 ) are wrapped by a layer with the following components:

[0045] Materials with open pores: Al 2 o 3 .

[0046] Impregnation agent: SiO 2 60% and B 2 o 3 40%.

[0047] This layer is placed through the following processing steps:

[0048] i) with Al 2 o 3 The powder is flame sprayed on the surface of the tube. As mentioned at the beginning, flame spraying is only suitable for parts with simple geometries.

[0049] ii) Immersion in suspension (zirconium silicate suspended in water).

[0050] iii) Thermal drying.

Embodiment 2

[0052] Taking into account the parameters of the task setting, a system of multi-layer protection layers was developed ( image 3 ).

[0053] In order to avoid possible extension and tension gaps in this system, the part is wrapped with a flexible ceramic quartz fiber fabric, which acts as a stress-absorbing support frame. The quartz fiber fabric is impregnated (wetted) with the particle size of the homogeneous nanomaterial. Preference is given here to fine-grained silicic acid It has a primary particle size of 3-200 nm, preferably 3-50 nm. At the temperature of use, the impregnated material is molten and liquid and closes the pores of the quartz fiber fabric as a melt, thus producing a gas-tight protective casing. This prevents oxygen from reaching the platinum surface and reacting with the platinum there to form platinum oxide, which then evaporates.

[0054] In order to protect the protective shell from reactions with the environment, a refractory zirconia fiber fabric...

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Abstract

Parts made of platinum or a Pt alloy, the outer surface of which comes in contact with an oxidizing atmosphere during operation and is covered with an open-cell ceramic or quartz layer, the pores containing a material that melts at the operating temperature as an infiltration material, are protected against loss caused by evaporation when used in an oxidizing atmosphere at temperatures exceeding 1200 DEG C. A method for reducing the evaporation rate out of platinum and Pt alloys in an oxidizing atmosphere comprises the steps of A. applying an open-cell quartz or ceramic layer, B. infiltrating said quartz or ceramic layer with a material melting at a lower temperature than the ceramic material such that pore spaces of the open-cell ceramic layer are partially or entirely filled by the infiltration material, C. use at temperatures exceeding 1200 DEG C.

Description

technical field [0001] The present invention relates to a protection against evaporation losses of parts made of platinum or Pt alloys used in oxidizing atmospheres at temperatures > 1200°C, in particular to reduce the loss of Pt and Rh at high temperatures by applying a barrier layer evaporation loss. Background technique [0002] Platinum is understood to mean a platinum material, which may generally contain other metal components. Other metal components are in particular unavoidable impurities. [0003] Platinum alloys or platinum-based materials are understood to mean alloys in which the main component is more than 75% platinum. The other materials in the alloy are preferably rhodium and / or iridium, in addition to unavoidable impurities. [0004] Evaporation rate is understood as the rate at which material is lost. Evaporation rates can be expressed in terms of mass loss per run period. [0005] For the production of high-value glass, such as aluminosilicate glas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B5/167C03B5/43C03B7/02
CPCC03B5/1675C03B5/43C03B7/02
Inventor 安妮特·卢卡斯戴维·弗朗西斯·勒普顿妮科尔·居布莱哈拉尔德·曼哈特马克·比辛格尔乌韦·扬奇斯特凡·福尔贝格
Owner HERAEUS MATERIALS TECHNOLOGY GMBH & CO KG
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