PCD Bearing Assembly Grooves for Brazing Crack Resistance

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Solution Overview

Problem

Current bearing apparatuses using polycrystalline diamond compacts (PDCs) face challenges with cracking during brazing and limited configurability, toughness, and wear resistance, which affect their performance and cost-effectiveness in mechanical applications.

Innovation Solution

The use of PCD bearing elements with specific magnetic properties and grooves on their surfaces, where the first PCD elements exhibit high coercivity and low magnetic saturation, and the second elements have lower coercivity and higher magnetic saturation, are mounted on support rings, with grooves on the first elements to control cracking and enhance cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If PCD bearing elements are brazed directly into support rings, then the bearing assembly is formed, but cracking occurs during brazing

Engineering Contradiction:

Improvebrazing processVSAvoidcracking resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Grooves are pre-formed in the PCD bearing elements before brazing to control stress distribution and prevent cracking during the brazing process. This preliminary structural modification enables successful brazing without the cracking that would otherwise occur.

Inventive Principle:

Principle #10Preliminary action

2Strength

If PCD bearing elements are used, then wear resistance is improved, but configurability is limited

Engineering Contradiction:

Improvewear resistanceVSAvoidconfigurability

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The bearing assembly uses multiple PCD bearing elements with different magnetic properties (first PCD elements with high coercivity and low magnetic saturation, second PCD elements with lower coercivity and higher magnetic saturation) that can be selectively positioned in different zones, enabling configurable arrangements tailored to specific application requirements while maintaining wear resistance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the bearing assembly use PCD elements with different properties - first PCD elements in certain zones and second PCD elements in other zones - allowing optimization of performance characteristics for different operational conditions while maintaining overall wear resistance.

Inventive Principle:

Principle #3Local quality

3Temperature

If grooves are formed in PCD bearing elements, then cooling is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecooling efficiencyVSAvoidgroove formation

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

Grooves are formed in the PCD bearing elements during the HPHT sintering process or as part of the initial manufacturing step, rather than requiring separate post-processing operations. This preliminary formation of cooling channels integrates the cooling function into the base manufacturing process, reducing overall manufacturing complexity.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration reduces cracking, improves toughness and wear resistance, and allows for more cost-effective and configurable bearing assemblies with enhanced thermal stability and performance in applications like subterranean drilling and motor systems.

Implementation Method 1

The at least one groove is configured to improve cooling of the first PCD bearing element during use

Methodology Applied

Scientific EffectHeat dissipation: Convection

Implementation Method 2

The at least one groove is configured to improve cooling of the first PCD bearing element during use and/or reduce widespread cracking during brazing of the at least one first PCD bearing element to a support ring

Methodology Applied

Scientific EffectStress distribution: Fracture Mechanics

Implementation Method 3

At least a portion of the first PCD bearing element exhibits one or more of a coercivity of about 125 Oersteds ('Oe') or more, a specific magnetic saturation of about 14 Gauss·cm3/gram ('G·cm3/g’) or less

Methodology Applied

Scientific EffectMagnetic properties: Magnetic Hysteresis

Data Source

PatentUS11512533B2Bearing assemblies, related bearing apparatuses, and related methods

Publication Date: 2022.11.29 US SYNTHETIC CORP

AI summary

Bearing assemblies that include a plurality of polycrystalline diamond (“PCD”) bearing elements, bearing apparatuses including such bearing assemblies, and methods of operating and fabricating such bearing assemblies and apparatuses are disclosed. In an embodiment, the plurality of PCD bearing elements of one or more of the bearing assemblies disclosed herein include at least one first PCD bearing element. At least a portion of the first PCD bearing element exhibits a coercivity of about 125 Oersteds or more and a specific magnetic saturation of about 14 Gauss·cm3/gram or less. The first PCD bearing element includes a bearing surface with at least one groove formed therein. In an embodiment, the plurality of PCD bearing elements also include at least one second PCD bearing element. The second PCD bearing element exhibits a coercivity that is less than and a specific magnetic saturation that is greater than the first PCD bearing element.