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Fused ceramic particle

A technology of ceramic particles and particles, which is applied in the directions of transportation and packaging, dissolution, chemical instruments and methods, etc., can solve the problems of high mechanical stress, inorganic fillers and coating graying, insufficient inertness, etc., and achieve the effect of improving the rupture strength

Active Publication Date: 2015-05-13
SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] ■Metal beads, especially those made of steel, are not sufficiently inert with respect to the product being processed, especially cause contamination of inorganic fillers and graying of paints, and their density is too high, requiring special grinding machines, which in particular Causes high energy consumption, high heat generation and high mechanical stress on the device

Method used

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  • Fused ceramic particle
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0100] The following non-limiting examples are given to illustrate the invention.

[0101] Measurement scheme

[0102] The specific properties of various mixtures of fused ceramic beads were determined using the following methods. It simulates well the actual performance at work in abrasive applications.

[0103] To determine the wear resistance known as "planetary" wear resistance, 20ml (volume measured with a graduated cylinder) of the beads to be tested with dimensions between 0.8mm and 1mm are weighed (mass m 0 ) and added to one of the 4 bowls of a RETSCH PM400 fast planetary mill, coated with dense sintered alumina, with a volume of 125 ml. 2.2 g of Presi silicon carbide (median particle size D50 of 23 μm) and 40 ml of water were added to the same bowl that already contained the beads. The bowl was closed and rotated (planetary motion) at 400 rpm for 1 hour and 30 minutes, reversing the direction of rotation every minute. The contents of the bowl were then washed t...

Embodiment 4

[0121] A comparison of Example 4 with Example 11 outside the invention shows a synergistic effect resulting from the addition of yttrium oxide and lanthanum oxide.

[0122] The reference sample ( figure 1 ) and for Example 8 ( figure 2 ) for structural analysis. The largest white areas correspond to zirconia dendrites, and the remaining areas constitute the silicate phase, in which the silica is black. It was observed that the silicate phase of the product according to the invention was very different from that of the reference product. In fact, the silicate phase of the products according to the examples of the invention consists of ZrO 2 , La 2 o 3 , Y 2 o 3 and Al 2 o 3 constitutes a continuous network of small crystals of zirconia, whereas the silicate phase of the reference product contains only intermittently dispersed small crystals of zirconia.

[0123] Thus, in one embodiment, particles according to the invention have a microstructure comprising zirconia d...

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Abstract

The present invention relates to a fused ceramic particle having the following chemical composition, as weight percentages based on the oxides, and for a total of 100%: ZrO2+HfO2: balance to 100%; 5.0%<SiO2<32.0%; 2.0%<La2O3<15.0%; 2.5%<Y2O3<11.0%; 0.5%<Al2O3<8.0%; and less than 1.0% of other oxides. Use in particular as a grinding agent, an agent for dispersion in a wet medium, a supporting agent, a heat-exchange agent, or for the treatment of surfaces.

Description

technical field [0001] The present invention relates to novel fused ceramic particles, in particular in the form of beads, to a process for the manufacture of these beads, and to the use of these particles as abrasives, dispersants in moist media or for surface treatment the use of. Background technique [0002] The mining industry uses granules for the fine grinding of substances that have optionally been dry preground by conventional methods, in particular for calcium carbonate, titanium oxide, gypsum, kaolin and iron ore. [0003] The paint industry, the ink industry, the dye industry, the magnetic paint industry and the pesticide compound industry use such granules for the dispersion and homogenization of various liquid and solid components. [0004] Finally, the surface treatment industry uses such granules, especially in operations such as cleaning of metal molds (e.g. for the manufacture of bottles), deburring of parts, descaling, preparation of supports to be coated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/484C09K23/00
CPCC04B35/484C04B2235/3217C04B2235/3225C04B2235/3227C04B2235/3248C04B2235/3418C04B2235/72C04B2235/78C04B2235/786C04B35/481
Inventor 山木尔·马林米格拉·瓦伦蒂尼
Owner SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN