Antioxidant Joint Compound with Stainless Steel Grit

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Solution Overview

Problem

Existing antioxidant joint compounds for electrical connections, particularly in underground applications, face challenges in providing sufficient mechanical pullout strength and corrosion resistance while avoiding complexities and costs associated with thermosetting resins and requiring additional tooling for texturization, and they often fail to meet standards like UL 467 and IEEE 837.

Innovation Solution

A joint compound comprising an antioxidant base material mixed with stainless steel grit, where the ratio of antioxidant to stainless steel grit is optimized between 30:70 to 90:10, with grit diameters between 0.012 inches to 0.125 inches, is applied to mating surfaces and crimped to enhance mechanical pullout strength and conductivity, penetrating dirt and corrosion to create a conductive pathway.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If oil-based antioxidant compound is used, then corrosion resistance is improved, but mechanical pullout strength is insufficient

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidmechanical pullout strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent combines oil-based antioxidant compound with stainless steel grit particles to create a composite joint compound. The antioxidant base material provides corrosion resistance while the embedded stainless steel grit particles provide enhanced mechanical interlocking and pullout strength, resolving the contradiction between corrosion protection and mechanical strength.

Inventive Principle:

Principle #40Composite materials

2Strength

If thermosetting hardenable resin is used, then mechanical strength is improved, but cost and process complexity increase

Engineering Contradiction:

Improvemechanical strengthVSAvoidprocess complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent uses a simple oil-based antioxidant compound with stainless steel grit that does not require complex curing processes or exact mixing ratios. This simpler, less expensive formulation achieves adequate mechanical strength through the grit particles' mechanical interlocking action without the need for thermosetting resins and their associated process complexities.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Strength

If surface texturization is applied, then mechanical pullout strength is improved, but additional tooling and process steps are required

Engineering Contradiction:

Improvemechanical pullout strengthVSAvoidease of connection

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent incorporates stainless steel grit particles into the antioxidant joint compound in advance, before application. This preliminary incorporation eliminates the need for separate surface texturization steps or additional tooling, as the grit particles are already positioned to provide mechanical interlocking when the compound is applied during the normal connection process.

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

The compound significantly increases mechanical pullout strength by 4.5 to 6 times over oil-based antioxidants and provides improved rotational and pullout strength, meeting stringent test standards, while preventing moisture ingress and oxidation, outperforming silicon carbide grit-based solutions.

Implementation Method 1

stainless steel grit mixed with the antioxidant base material to provide improved mechanical pullout strength

Methodology Applied

Scientific EffectMechanical interlocking:

Implementation Method 2

antioxidant base material... to prevent moisture ingress and oxidation of the crimped connection

Methodology Applied

Scientific EffectOxidation prevention: Oxidation

Implementation Method 3

penetrate any pre-existing dirt or corrosion present on the mating surfaces of the components, including the connector, to create a conductive pathway

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS8268196B2Antioxidant joint compound and method for forming an electrical connection

Publication Date: 2012.09.18 PANDUIT CORP

AI summary

A joint compound for electrical connections is disclosed which includes an antioxidant base material and a quantity of stainless steel grit mixed with the antioxidant base material to provide improved mechanical pullout strength. The joint compound has a weight ratio of antioxidant to stainless steel grit in the range of from about 30:70 to about 90:10, preferably, from about 40:60 to about 70:30, and more preferably about 50:50. The stainless steel grit is cut wire having a diameter within the range of from about 0.012 inches to about 0.125 inches, with a preferred diameter within the range of from about 0.012 inches to about 0.030 inches, and 0.017 inches being a more preferred stainless steel grit diameter.