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Laser method for making shaped ceramic abrasive particles, shaped ceramic abrasive particles, and abrasive articles

A technology of abrasive grains and ceramics, applied in the field of abrasive products, can solve the problems of low cost and separation, and achieve the effects of increased adhesion, low bulk density, and improved grinding performance

Inactive Publication Date: 2013-07-03
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this technique is somewhat less expensive and generally has a lower degree of separation than methods using microreplicated tools, it still requires separate screens for each desired shape of shaped ceramic abrasive particles

Method used

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  • Laser method for making shaped ceramic abrasive particles, shaped ceramic abrasive particles, and abrasive articles
  • Laser method for making shaped ceramic abrasive particles, shaped ceramic abrasive particles, and abrasive articles
  • Laser method for making shaped ceramic abrasive particles, shaped ceramic abrasive particles, and abrasive articles

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0242] The procedure of Comparative Example A was repeated, except that the ambient drying time of the gel sheet was increased to 30 minutes, and a stainless steel substrate was used. Figure 13 A gel sheet just after laser cutting is shown.

example 2

[0244] The procedure of Comparative Example A was repeated except that the ambient drying time of the layer of ceramic precursor material was increased to 2 hours and a polyester film substrate was used. Figure 14 A gel sheet just after laser cutting is shown.

[0245] The particles are sintered (fired) in a tube furnace at 1400°C. The resulting sintered particles have a true density of 3.950 g / cm 3 , a thickness of about 0.332 mm and a side length of about 1.80 mm. Figure 15 SEM micrographs of sintered particles.

example 3

[0247] Two 7 inch (18 cm) diameter x 7 / 8 inch (2.2 cm) center hole abrasive discs comprising the sintered abrasive particles of Example 2 were prepared. Discs were prepared as follows: A phenolic resin primer coating consisting of 49 parts of a 75% solids aqueous solution of phenol-formaldehyde resin (phenol:formaldehyde ratio of 1.5 to 2.1:1, with 2.5% potassium hydroxide), 41 parts calcium carbonate ("HUBERCARB Q325" from J.M. Huber Corporation (Edison, New Jersey)), and 10 parts water. The abrasive grains of Example 2 were electrostatically coated on the primer coat and a size coat was applied [from 29 parts of a 75% solids aqueous solution of phenol-formaldehyde resin (phenol:formaldehyde ratio of 1.5 to 2.1:1, oxidized with 2.5% hydroxide Potassium catalyzed), 51 parts filler (“CRYOLITE TYPE RTN-C” from Koppers Trading (Pittsburgh, Pennsylvania)), 2 parts iron oxide pigment, and 18 parts water]. All coating weights are shown in Table 1 (below). After curing, the grindin...

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Abstract

A method of making shaped ceramic abrasive particles includes cutting a layer of ceramic precursor material using a laser beam and forming shaped ceramic precursor particles. Further thermal processing provides shaped ceramic abrasive particles. Shaped ceramic abrasive particles producible by the methods and abrasive articles containing them are also disclosed.

Description

technical field [0001] The present invention relates to abrasive grains, methods for making abrasive grains, and abrasive articles comprising abrasive grains. Background technique [0002] It is known to prepare shaped ceramic abrasive particles. For example, one method includes sequentially filling cavities on the surface of a microreplicated tool with a boehmite sol-gel, drying the sol-gel to form shaped boehmite particles within the cavities of the tool, forming The boehmite particles are removed from the cavity of the tool and the shaped boehmite particles are then sintered to form the alpha-alumina shaped abrasive particles. While the method is conceptually simple, the cost of tooling is usually quite high. In addition, different tools are required to prepare new ceramic shaped abrasive particles of desired shape. [0003] Other methods of making shaped ceramic abrasive particles include screen printing techniques in which a sol-gel ceramic precursor material is scre...

Claims

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Application Information

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IPC IPC(8): B24D18/00B24D3/00C09K3/14
Inventor 丹尼斯·G·韦利甘查尔斯·J·斯图丁纳四世德怀特·D·埃里克森斯科特·A·鲍姆爱德华·J·吴吴平凡特拉维斯·L·波茨
Owner 3M INNOVATIVE PROPERTIES CO
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