Abrasive particles, abrasive articles and methods of making and using the same

A technology of abrasive particles and abrasive products, applied in chemical instruments and methods, abrasives, manufacturing tools, etc., can solve problems such as increasing costs and restricting supply

Inactive Publication Date: 2017-02-22
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

REO availability has become a major issue for all industries in recent years, limiting supply and driving up costs

Method used

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  • Abrasive particles, abrasive articles and methods of making and using the same
  • Abrasive particles, abrasive articles and methods of making and using the same
  • Abrasive particles, abrasive articles and methods of making and using the same

Examples

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example

[0152] All parts, percentages, ratios, etc. in the examples, as well as in the remainder of this specification, are by weight unless otherwise indicated. In the tables below, "nm" means not measured.

[0153] A summary of the various starting materials used to prepare the Examples is provided in Table 1 below.

[0154] Table 1

[0155]

[0156]

[0157] Disc preparation method

[0158] A disc with a 7 inch (17.8 cm) diameter and a 7 / 8 inch (2.2 cm) diameter mandrel hole backed with a vulcanized fiber thickness of 0.83 mm (33 mils) (obtained as DYNOS vulcanized fiber from Tross, Germany) DYNOS GmbH, Troisdorf, Germany) was coated with a 3.5 gram / disc (g / disc) primer composition consisting of 49.15 parts by weight of resole phenolic resin, 40.56 parts by weight of filler, 0.1 part of surfactant 1 and 10.19 parts by weight of water. Then the disk is electrostatically coated with abrasive particles of 15.0 g / disk, and then coated with a compounding composition of 13....

example 1

[0167] Example 1 is shaped abrasive particles prepared by alumina sol-gel without incorporation of seed crystals. The shaped abrasive particles of Example 1 were made by preparing a boehmite sol-gel using the following recipe: DISPERAL Alumina monohydrate powder (1600 parts by weight from Sasol North America). The resulting sol-gel was aged for at least 1 hour prior to coating. The sol-gel was forced into a production mold with a triangular mold cavity (28 mil (0.71 mm) deep, 110 mil (2.78 mm) on each side). The draft angle between the sidewalls and the bottom of the mold was 98 degrees. The mold was fabricated with 50% of the mold cavity having 8 parallel ridges rising from the cavity floor, which intersected one side of the triangle at a 90 degree angle, and the remaining cavity having a smooth bottom mold surface. The spacing of the parallel ridges was 0.277 mm and the cross-section of the ridges was triangular with a height of 0.0127 mm and an angle of 45 degrees betwee...

example 4-9

[0171] Example 4-9 was prepared in the same manner as Example 1, except that the composition of the modifying agent was changed and Fe was added 2 o 3 Seed crystals, and change the calcination conditions, are shown in Table 2. These examples containing beta-alumina were seeded and achieved much higher density and hardness. As noted in Table 3, the grinding performance exceeded the non-seeded Example 3 in all cases and met or exceeded the control disc in 2 cases.

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Abstract

The present invention relates to abrasive particles comprising an alpha-alumina crystalline phase and from 0.25% to 20% by weight of a beta-alumina crystalline phase, the weight% being based on the combined alpha-alumina crystalline phase and The total weight of the β-alumina crystalline phase is calculated. The β-alumina crystalline phase is represented by the empirical formula (X)(Q)Al10O17, where: X is selected from Sr, Ca and Ba; and Q is selected from Mg, Co, Ni and Zn. Also disclosed are methods of making and using abrasive articles as well as said abrasive articles.

Description

technical field [0001] The present invention relates to abrasive grains and methods for their preparation. The abrasive particles can be incorporated into a variety of abrasive articles, including bonded abrasives, coated abrasives, nonwoven abrasives, and abrasive brushes. Background technique [0002] Alpha-alumina is widely used as an abrasive in the abrasive industry. It can be used in pure form or, more preferably, with additives that enhance its grinding properties. β-alumina is a form of alumina in which metal ions other than aluminum and oxygen are contained in a crystal lattice. β-alumina generally exhibits inferior properties as an abrasive compared to α-alumina. [0003] Many commercially important alpha-alumina abrasive grains are derived from sol-gel precursors. They are produced by preparing a dispersion (e.g. a sol) comprising water, an alpha-alumina precursor such as alumina monohydrate (boehmite) and optionally a peptizing agent (e.g. an acid such as nit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D3/14C04B35/111C04B35/117C09K3/14
CPCC04B35/1115C04B35/117C09K3/1409C04B35/624C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3217C04B2235/3222C04B2235/3244C04B2235/3272C04B2235/3275C04B2235/3279C04B2235/3284C04B2235/77C04B2235/80
Inventor 拉里·D·门罗
Owner 3M INNOVATIVE PROPERTIES CO
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