Sintered ceramic product having a nitrogenous mold with improved surface properties

A technology for sintering ceramics and products, applied in transportation and packaging, thin material handling, etc., can solve the problems of time-consuming and expensive operation

Inactive Publication Date: 2008-12-10
SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this operation is time-consuming and expensive

Method used

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  • Sintered ceramic product having a nitrogenous mold with improved surface properties
  • Sintered ceramic product having a nitrogenous mold with improved surface properties
  • Sintered ceramic product having a nitrogenous mold with improved surface properties

Examples

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Embodiment Construction

[0073] The invention is further illustrated in the following non-limiting examples.

[0074] · To characterize the ratio of unadhered particles (Test #1), a 48 mm wide adhesive tape, such as Scotch Box Sealing Tape 355 (polyester and synthetic rubber resin) was applied to the surface of the product under test and then peeled off. This operation is repeated until all unattached particles are removed from the surface. Observation of the adhesive surface of the tape with a scanning electron microscope confirmed that only unadhered particles were removed and not particles (having a diameter greater than 200 microns). Thereafter, the peeled material was weighed and divided by the surface area of ​​the tape adhered to the surface of the product under test to obtain the Tw index in grams / square meter. This measurement is combined with observation of the surface of the product under test using a scanning electron microscope to verify that all non-adhered particles have been properl...

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Abstract

The sintered ceramic product comprises a granular material bound by a nitrogenous mold. According to the invention, at least one anti-dust agent selected among calcium and boron exists in a surface layer of the product, the mass ratio of all the anti-dust agents in the surface layer being greater than that measured underneath this layer. This product advantageously has a reduced ratio of non-adherent particles to its surface.

Description

technical field [0001] The present invention relates to a sintered ceramic product comprising granulat bonded by a nitrogen-containing matrix and a method for its manufacture. Background technique [0002] The presence of a nitrogen-containing matrix implies fabrication by reactive sintering. Nitrogen, usually supplied by a nitrogen atmosphere, then reacts during sintering to form a nitrogen-containing matrix, for example made of SiAlON, which acts as a binder for particulate material such as silicon carbide, SiAlON or aluminum oxide. In the following description, these products are referred to as "nitrogen-containing matrix" materials. [0003] Sintered products with a nitrogen-containing matrix should be compared with non-reactive sintering, e.g. by sintering Si 3 N 4 It is distinguished from products made of a mixture of BN powder and BN powder. In the non-reactive sintering method, the nitrogen supplied by the raw materials is little or not reacted during the sinteri...

Claims

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Application Information

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IPC IPC(8): C04B41/85C04B35/65
CPCC04B35/103C04B35/117C04B35/565C04B35/5805C04B35/6263C04B35/6316C04B41/009C04B41/4578C04B41/85C04B2235/3208C04B2235/3217C04B2235/3454C04B2235/3804C04B2235/3821C04B2235/386C04B2235/3869C04B2235/3873C04B2235/402C04B2235/428C04B2235/5427C04B2235/72C04B2235/80Y10T428/26C04B41/4519C04B41/4539C04B41/455C04B41/457C04B41/5006C04B41/5058C04B2103/001C04B35/10C04B35/584C04B35/597
Inventor E·若热F·鲁莱J·舍恩纳莱赫
Owner SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN
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