Boron Aluminum Magnesium Coating for Earth-Boring Bit
First Claim
1. A downhole well tool having at least one rotatable member, a bearing system including a bearing member having bearing surfaces on which the rotatable member rotates and a seal having a seal surface in sliding engagement with a mating seal surface to retain lubricant within the bearing system, the improvement comprising:
- at least one of the surfaces comprising an AlMgB14 alloy material.
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Accused Products
Abstract
A rotatable cone earth boring bit has a bearing system with at least on the surfaces being AlMgB14 alloy material. The alloy material also contains an alloying agent, which may be titanium boride (TiB2); titanium carbide (TiC) plus iron, nickel and carbon; silicon nitride (Si3N4) powder; whiskered silicon nitride (Si3N4); boron carbide (B4C); titanium boride (TiB2); or tungsten boride (W2B4). The surface containing the AlMgB14 alloy material may be a journal surface or thrust face on the bearing pin. The surface containing the AlMgB14 alloy material may also be a seal surface, either on a metal face seal or a gland on the bearing pin engaged by an elastomeric ring. The AlMgB14 alloy material may a coating or it may be a free-standing structural member within the bearing system.
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Citations
21 Claims
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1. A downhole well tool having at least one rotatable member, a bearing system including a bearing member having bearing surfaces on which the rotatable member rotates and a seal having a seal surface in sliding engagement with a mating seal surface to retain lubricant within the bearing system, the improvement comprising:
at least one of the surfaces comprising an AlMgB14 alloy material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An earth boring bit, comprising:
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at least one rotatable cone with external cutting elements; a bearing system comprising; a bearing pin having bearing surfaces on which the cone rotates; a seal having a seal surface in sliding engagement with a mating seal surface to retain lubricant within the bearing system; at least one of the surfaces comprising an AlMgB14 alloy material; and the AlMgB14 bearing material having an alloying agent selected from a group consisting of;
titanium boride (TiB2);
titanium carbide (TiC) plus iron, nickel and carbon;
silicon nitride (Si3N4) powder;
whiskered silicon nitride (Si3N4);
boron carbide (B4C);
titanium boride (TiB2); and
tungsten boride (W2B4).- View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An earth boring bit, comprising:
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at least one rotatable cone with external cutting elements, the cone having a cavity with a bearing surface; a bearing pin having a bearing surfaces on which the bearing surface of the cone rotates; at least one of the bearing surfaces comprising an AlMgB14 alloy coating; and the AlMgB14 bearing coating having an alloying agent selected from a group consisting of;
titanium boride (TiB2);
titanium carbide (TiC) plus iron, nickel and carbon;
silicon nitride (Si3N4) powder;
whiskered silicon nitride (Si3N4);
boron carbide (B4C);
titanium boride (TiB2); and
tungsten boride (W2B4).- View Dependent Claims (21)
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Specification