EP0228856A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Abrasive grits formed of ceramic containing oxides of aluminum, and yttrium, method of making and using the same and products made therewith
Assignee: 3M Co
•
Filing: 1986-12-15
•
Granted: —
•
Expires: 2006-12-15
Abstract
Abstract Ceramic abrasive grits comprising alpha alumina and at least about 0.5 percent by weight yttria are prepared by mixing an aqueous dispersion of alpha alumina monohydrate and yttrium compound, gelling the resultant mixture, drying the gel to produce a dried solid, crushing the dried material to produce grits, calcining the dried grits to substantially remove bound volatile materials, and firing the grits to produce a ceramic material. The yttrium for the most part is in the form of a yttrium aluminum garnet. Abrasive products comprising the abrasive grits are also claimed as is a method of grinding a workpiece with such abrasive products.
Inventors
- 👤 Larry D. Minnesota Mining And Monroe
- 👤 William P. Minnesota Mining And Wood
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 18:13
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; B; B24; B24D; B24D11/00; B24D3/00; B24D3/34; B24D3/346; C01; C01F; C01F7/00; C01F7/02; C01F7/021; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/1115; C09K3/1409; C09K3/1418
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
16 words
Ceramic abrasive grits comprising alpha alumina characterized by containing at least about 0.5% by weight yttria.
Claim 2
Dependent Claim
16 words
Ceramic abrasive grits comprising alpha alumina characterized by containing at least about 0.5% by weight yttria.
Claim 3
Dependent Claim
19 words
The ceramic abrasive grits of claim 1 further characterized-by said yttria being in the form of a garnet phase.
Claim 4
Dependent Claim
26 words
The ceramic abrasive grits of claim 1 further characterized by the yttria content being from about 1 to about 30% by weight of the total weight.
Claim 5
Dependent Claim
12 words
The ceramic abrasive grits of claim 1 further characterized by being shaped.
Claim 6
Dependent Claim
13 words
An abrasive product characterized by including said ceramic abrasive grits of claims 1-4.
Claim 7
Dependent Claim
22 words
A coated abrasive sheet material characterized by including the abrasive grits of claims 1-4 and further characterized by including a grinding aid.
Claim 8
Dependent Claim
18 words
The coated abrasive sheet material of claim 6 further characterized by said grinding aid being RBF 4 .
Claim 9
Independent Claim
87 words
A method of making ceramic abrasive grits, said method comprising the steps of: a. mixing an aqueous dispersion of alpha alumina monohydrate; b. gelling the resultant mixture; c. drying the gel to produce a dried solid; d. crushing the dried material to produce grits; e. calcining the dried grits to substantially remove bound volatile materials; and f. firing the grits to produce a ceramic material characterized by including in said mixture yttrium compound in an amount to provide at least about 0.5% by weight yttria after firing.
Claim 10
Independent Claim
87 words
A method of making ceramic abrasive grits, said method comprising the steps of: a. mixing an aqueous dispersion of alpha alumina monohydrate; b. gelling the resultant mixture; c. drying the gel to produce a dried solid; d. crushing the dried material to produce grits; e. calcining the dried grits to substantially remove bound volatile materials; and f. firing the grits to produce a ceramic material characterized by including in said mixture yttrium compound in an amount to provide at least about 0.5% by weight yttria after firing.
Claim 11
Dependent Claim
19 words
The method of claim 8 further characterized by said yttrium compound is a yttrium salt of a volatile anion.
Claim 12
Dependent Claim
16 words
The method of claim 8 further characterized by including the step of shaping the gelled material.
Claim 13
Dependent Claim
20 words
The method of claim 8 further characterized by including the step of adding a nucleating agent to the aqueous dispersion.
Claim 14
Independent Claim
56 words
A method of grinding a workpiece surface comprising: a. causing rapid surface movement of an abrasive article comprised of ceramic abrasive grits; and b. moving the surface of said abrasive article into surface grinding contact with said workpiece surface, characterized by said ceramic abrasive grits being alpha alumina and at least about 0.5% by weight yttria.
Claim 15
Independent Claim
56 words
A method of grinding a workpiece surface comprising: a. causing rapid surface movement of an abrasive article comprised of ceramic abrasive grits; and b. moving the surface of said abrasive article into surface grinding contact with said workpiece surface, characterized by said ceramic abrasive grits being alpha alumina and at least about 0.5% by weight yttria.
Claim 16
Dependent Claim
15 words
The method of claim 12 further characterized by said workpiece being made of stainless steel.
Claim 17
Dependent Claim
16 words
The method of claim 12 further characterized by said abrasive article also including a grinding aid.
Claim 18
Dependent Claim
14 words
The method of claim 12 further characterized by said grinding aid being KBF 4'
Claim 19
Dependent Claim
17 words
The method of claim 12 further characterized by said abrasive product being a coated abrasive sheet material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.