High-Strength, Low-Friction, Thermally Stable QuesTalloy™- Co

In 2009, QuesTek was awarded a U.S. Marine Corps-funded SBIR Phase I project to design and develop materials that would be capable of replacing Cu-Be alloys that are currently used on military platforms.

Due to their low inherent coefficient of sliding friction, high-strength beryllium-copper (Cu-Be) alloys are widely used for load-bearing applications such as bushings. Cu with 1.9 wt% Be, designated as C17200, is a precipitation hardening alloy that achieves the highest strength in Cu-based alloys. However, Be exposure during the manufacturing of Cu-Be alloys can be deadly, and therefore, an alternative high-strength, wear-resistant alloy is needed.

By utilizing the Materials by Design® approach, QuesTek designed and developed a high-strength, low-friction, thermally stable cobalt-based alloy with comparable yield strength and superior tensile strength, ductility and frictional behaviour versus commercially-available Cu-Be alloys. 

Improved QuesTalloy-Co Alloy Properties versus Incumbent Materials

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Alloy Typical Properties

0.2% YS (ksi)

Elong (%)

Wear Ranking

Cold Workability

Cold Work required?

Hot Workability

QuesTalloy-Co

~130

TBD (>10)

1

TBD

No

Good

Cuprium®

~130

~16

2

Good

No

Good

Cu-Be (Cu-1.9Be)

140

3-8

3 (worst)

Good

No

Good

ToughMet® 3 (Cu-15Ni-8Sn)

107

3-10

2

Excellent

Yes

Limited

BioDur® CCM (Co-Cr-Mo)

85

26

1

Excellent

Yes

Good

Material and Licensing Availability

We’re always interested in speaking with potential licensees and with major end-users/OEMs about material needs and industry developments. Please contact us for more information or if you would like to talk about your application.

Relevant files

Presentations