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Layer or coating and a composition for the production thereof

A composition, coating technology, applied in the direction of coatings, nanotechnology for materials and surface science, manufacturing tools, etc., which can solve the wear of the release layer, not very resistant to friction, and cannot be used for multiple uses. Regular renewal and other problems to achieve the effect of resisting the corrosion of the substrate

Inactive Publication Date: 2013-03-27
塞拉诺维斯有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, neither graphite or molybdenum disulphide-based release layers nor boron nitride-based release layers are generally very friction-resistant
In particular, the processing of light metal melts or glass melts, in which melts with high flow velocities occur, imposes high mechanical demands that the known inorganic release layers have not been able to satisfy for a long time
The release layers known from the prior art wear accordingly very quickly and are therefore generally not suitable for repeated use and must be regularly renewed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 4.3 kg of silicon nitride (1 μm-5 μm particle size, company H.C. Starck) were mixed with 4.3 kg of water and 0.1 kg of polyacrylate (BYK 192, BYK-Chemie GMBH) and homogenized in an agitator ball mill for 3 hours. In addition to this first mixture, three other mixtures were prepared separately. The second mixture consisted of 2.6 kg of acyl polysiloxane (inosil ww from Inomat GmbH) and 11.44 kg of an aqueous suspension consisting of nanoscale zirconium dioxide (solids content 45% by weight, median particle size approx. 10 nm) composition. The third mixture consisted of 25.7 kg of alumina (Almatis, CT 800SG, median particle size approximately 3 μm) dispersed in 38.3 kg of water, and the fourth mixture consisted of 4.3 kg of boron nitride (Saint-Gobain Corporation) dispersed in 6.3 kg of water. )composition. The second, third and fourth mixtures are successively added to the first mixture under stirring conditions. A ready-to-use slurry is thus formed.

Embodiment 2

[0093] The slurry from Example 1 was applied as a layer on the samples from the refractory concrete. After 15 days of immersion of the sample in a light metal melt at 750° C., no damage to the layer was found. Solidified casting sand (Gu βhaut) can easily come out. In tests with comparable refractory concrete samples without the layer of the invention, the light metal melt penetrated the concrete samples, thereby tripling their weight.

Embodiment 3

[0095] The slurry from Example 1 was applied to boiler steel pipes (Kesselstahlrohr) (13CrMo44). The layer thickness is 40-50 μm. After drying and calcination, the coated pipe was exposed to a light metal melt at 750°C. After 5 hours of exposure to the light metal melt, the coating remained undamaged and the solidified casting sand could easily come off.

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Abstract

A composition for producing a layer or a coating, especially a mold release layer, includes aluminum titanate and / or silicon nitride, an oxidic inorganic component and a binder comprising nanoscale particles.

Description

technical field [0001] The present invention relates to compositions for producing layers or coatings, in particular release layers, methods for producing such compositions, layers or coatings produced thereby and coatings at least partially coated with such layers or coatings. covered objects. Background technique [0002] When processing molten inorganic materials, in particular metal or glass melts, tools, auxiliary tools and especially molds which come into direct contact with the liquid material are usually supplied with a release agent. The purpose of this release agent, often called a release layer, is to avoid reaction of the melt with the surface. Melt adhesion on these surfaces should be as low as possible, both in the liquid state and in the solid state (after cooling). Thus, for example, a cast part can be easily released from the mold with the release layer. The mold release layer reduces the wear of the mold and thus has a positive effect on the durability o...

Claims

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Application Information

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IPC IPC(8): C04B35/478B22C1/18
CPCC04B35/478C04B2235/386B22C3/00C04B2235/3232C04B41/009C04B2235/3873C04B35/63424C04B2235/5454C04B2235/3222C04B2235/483C04B41/5066C04B35/117C04B35/119C04B2235/5436C04B41/87B82Y30/00C04B41/5041C04B2111/0087C04B41/4539C04B41/5031C04B41/5042C04B41/5064C04B35/18C04B35/22C04B35/52C04B35/66C04B41/5006
Inventor S·法伯R·诺宁格
Owner 塞拉诺维斯有限责任公司