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Products made of dense silicon carbide

A silicon carbide and product technology, applied in the field of dense products, can solve problems such as low relative density

Inactive Publication Date: 2017-06-20
SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen that the relative densities of samples obtained by such methods are still below 97%, regardless of the percentage of oxide phases introduced

Method used

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  • Products made of dense silicon carbide
  • Products made of dense silicon carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Embodiment 1 (comparison):

Embodiment 2

[0130] Embodiment 2 (according to the present invention):

[0131] The product of embodiment 2 of the present invention obtains in the following manner:

[0132] According to the first step a), prepare the slip by mixing the following ingredients:

[0133] - 2212 grams of water,

[0134] - 2328 g of silicon carbide powder with trade name Starck UF25 exhibiting 25 m 2 A specific surface area per gram, a median particle size equal to 0.43 µm and an oxygen element content equal to 1.7% by weight, and containing more than 99% silicon carbide,

[0135] - 122.5 grams of YAG sold by Baikowski (Y 3 al 5 o 12 ) powder exhibiting a median particle size equal to 0.18 µm and a Y greater than 99.5% 3 al 5 o 12 content. The weight of the YAG powder accounts for 5% of the total weight of the mixture (silicon carbide powder and YAG powder),

[0136] - 0.88 g of dispersant (Castament FS10, marketed by BASF), ie 0.038% by weight of the silicon carbide powder.

[0137] The solid con...

Embodiment 3

[0145] Embodiment 3 (comparison):

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Abstract

The invention relates to a sintered product exhibiting a relative density of greater than 97%, said sintered product consisting of - more than 92% by weight of silicon carbide, - 0.5% by weight to 8% by weight of elements containing O, Si and a or two amorphous minor phases of elements selected from Al and Y, - other elements present in the product as additional phases or unavoidable impurities amounting to less than 2%, wherein silicon carbide is present in the form of crystalline grain form, and wherein the secondary phase is amorphous, located substantially at the boundaries of silicon carbide grains.

Description

technical field [0001] The present invention relates to dense products based on silicon carbide (carbure de silicium), which are used inter alia for their wear-resistant properties, in particular resistance to abrasion caused by impacts, also known in the art as impact wear. Background technique [0002] When considering the wear of abrasively applied products, sliding wear and impact wear are represented in the art. [0003] Sliding wear consists of wear produced by tangential friction of abrasive particles enclosed in the environment. Usually confirmed by the test of standard ASTM G76-04 at the tangential angle of incidence at the surface of the sample to be tested. [0004] Impact wear or impact erosion by impact of solid particles Wear or erosion consists of wear from free abrasive particles. Usually confirmed by the test of standard ASTM G76-04 with an angle of incidence of the abrasive grain at this time of about 90°. [0005] These stresses thus involve and require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/575
CPCC04B35/575C04B2235/3217C04B2235/3225C04B2235/666C04B35/565C04B35/573C04B35/62625C04B35/62695
Inventor G.罗西凯E.约尔热
Owner SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN