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Fiberizable glass
| Details |
Inventors: LaCourse, William C.; Clark, Terence J.;
Assignee: Borg-Warner Corporation (Chicago, IL)
Primary Examiner: Thomas; Earl C.
Assistant Examiner: Bell; Mark
Attorney, Agent or Firm: Shekleton; Joseph
A lead-free, fiberizable glass composition. The glass is characterized by a relatively low hardness rating and is accordingly useful in preparing friction surfaces. Its composition includes, on a weight basis, from about 45% to about 75% of silicon dioxide, from about 15% to about 30% of potassium oxide and from about 2% to about 10% of magnesium oxide. |
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DETAILED DESCRIPTION We claim: 1.
A fibrous, lead-free glass having low hardness properties consisting essentially, on a weight basis, of from about 45% to about 75% of silicon dioxide, from about 15% to about 30% of potassium oxide and from about 2% to about 10% of magnesium oxide.
2.
The glass of claim 1 which additionally contains up to about 25% of boron oxide.
3.
The glass of claim 1 which additionally contains up to about 10% of zinc oxide.
Description:
This invention relates as indicated to a fiberizable glass composition.
More particularly it relates to such a fiberizable glass composition which is characterized by low hardness and is, therefore, especially adapted for use as a frictional material.
Present day frictional materials invariably incorporate asbestos as an important component.
The reason for this is that asbestos is characterized by many of the properties which are useful in the formulation of a good frictional material such as a brake lining or clutch surface.
It is chemically and biologically inert, it is fibrous, it has about the right degree of hardness, the right coefficient of friction with ferrous metals, and it is cheap.
For these reasons, asbestos has been a mainstay of frictional materials in industry in general and in particular, in the automotive industry.
In the recent past, however, the continued use of asbestos has come under a cloud because of the realization that it presents a serious cancer hazard for those who work with it.
There has been an increasing concern about such hazard with the result that the expense of health precautions now required for the safe handling of asbestos has become a significant burden.
Accordingly, it has now become desirable to eliminate asbestos from frictional material formulations and to find a replacement.
The fiberizable glass composition of the present invention is, as indicated, characterized by low hardness and is, therefore, especially adapted for use as a frictional material.
It is a lead-free glass having low hardness properties comprising from about 55% to about 75% of silicon dioxide, from about 15% to about 30% of potassium oxide and from about 2% to about 10% of magnesium oxide
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