Patent EP0462091A1 successfully refreshed from Google Patents.
EP0462091A1
Expired / Lapsed
EP
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Improved tools for percussive and rotary crushing rock drilling provided with a diamond layer
Assignee: Sandvik Intellectual Property AB
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Filing: 1991-06-12
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Granted: —
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Expires: 2011-06-12
Abstract
Abstract The present invention relates to a rock bit button (1) of cemented carbide for percussive or rotary crushing rock drilling. The button (1) is provided with a layer of diamond (3) produced at high pressure and high temperature in the diamond stable area. The cemented carbide has a multi-phase structure having a core that contains eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.
Inventors
- 👤 Mats Waldenström
- 👤 Udo Fischer
- 👤 Lars Hillert
- 👤 Mahlon Dennis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 23:15
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5676; C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08; E21B10/573; E21B10/5735
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
Cemented carbide rock bit button for percussive and rotary crushing rock drilling at least partly covered with a diamond layer bonded at high pressure and high temperature characterized in that said button has a multi-phase structure with a core containing eta-phase surrounded by a surface zone free of eta-phase.
Claim 2
Dependent Claim
31 words
Rock bit button according to claim 1 characterized in that the binder phase content in a zone close to the eta-phase containing core is higher than the nominal binder phase content.
Claim 3
Dependent Claim
31 words
Rock bit button according to any of the preceding claims characterized in that the binder phase content in the surface of said button is 0,1-0,9 of the nominal binder phase content.
Claim 4
Dependent Claim
25 words
Rock bit buttons according to any of the preceding claims characterized in that said button contains at least one diamond body beneath the diamond layer.
References Cited (Backward Citations)
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