Cerium Oxide Seal Ring Composition Against Silicon Oxide Deposition

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Solution Overview

Problem

Sliding members for sealing face performance degradation due to silicon oxide deposition when exposed to aqueous sealing fluids containing silicate-based components, leading to widened sliding gaps and impaired sealing efficiency.

Innovation Solution

A sliding member composed of a sintered body with 1.0 to 12.5 wt% cerium oxide, a combination of 20 to 50 wt% graphite and graphitizable carbon, and the remainder as non-graphitizable carbon, which suppresses silicon oxide generation and deposition, maintaining sealing performance even in environments with silicate-based components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sliding member is used in an aqueous sealing fluid containing silicate-based components, then sealing function is provided, but silicon oxide deposits form on the surface causing sliding gap widening and sealing performance impairment

Engineering Contradiction:

Improvesealing performanceVSAvoidsilicon oxide deposition

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies cerium oxide to convert the harmful silicate-based rust inhibitor into a beneficial effect. The cerium oxide reacts with silicate components in the aqueous sealing fluid to form protective layers that prevent silicon oxide deposition, thereby converting potentially harmful chemical interactions into protective mechanisms that maintain sealing performance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the chemical composition parameters of the sliding member by incorporating cerium oxide at specific concentrations (0.1-10 wt%). This parameter change modifies the surface chemistry of the sliding member to resist silicon oxide deposition while maintaining moldability and sealing functionality in silicate-containing environments

Inventive Principle:

Principle #35Parameter changes

2Reliability

If cerium oxide is added to suppress silicon oxide generation, then sealing performance is maintained, but moldability must not be impaired

Engineering Contradiction:

Improvesealing performanceVSAvoidmoldability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent optimizes the concentration parameter of cerium oxide within the range of 0.1-10 wt% to achieve the right balance between suppressing silicon oxide generation and maintaining moldability. This parameter optimization ensures that sufficient cerium oxide is present to prevent deposition while not exceeding the threshold that would compromise manufacturing feasibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining cerium oxide with the base sliding member materials. This composite structure leverages the protective properties of cerium oxide while maintaining the structural integrity and moldability characteristics of the original sliding member composition

Inventive Principle:

Principle #40Composite materials

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 solution effectively prevents silicon oxide deposition on the sliding member's surface, maintaining sealing performance and moldability, thereby enhancing the durability and efficiency of the seal device, especially when exposed to aqueous sealing fluids.

Implementation Method 1

Since the sliding member for sealing according to the present invention contains the cerium oxide in the predetermined ratio, silicon oxide can be suppressed from being generated on the surface of the sliding member even in an environment exposed to an aqueous solution containing, for example, a silicate-based component

Methodology Applied

Scientific EffectChemical reaction suppression:

Implementation Method 2

since the sliding member for sealing according to the present invention contains the non-graphitizable carbon such as hard carbon (HC) in a predetermined ratio, if a deposit is generated on a sliding surface, the deposit is polished, so that the deposit is suppressed from being formed on the surface of the sliding member for sealing

Methodology Applied

Scientific EffectMechanical polishing: Abrasion

Implementation Method 3

since the sliding member for sealing according to the present invention also contains a combination of the graphite and the graphitizable carbon in a predetermined ratio, heat is suppressed from being generated on the sliding surface of the sliding member, so that the generation of the silicon oxide is suppressed

Methodology Applied

Scientific EffectThermal management:

Implementation Method 4

This type of sliding member is produced by mixing a carbon filler, a binder resin, and silicon oxide, and molding and sintering the mixture

Methodology Applied

Scientific EffectSintering: Sintering

Data Source

PatentUS11421177B2Sliding member for sealing and seal device

Publication Date: 2022.08.23 EAGLE INDS

AI summary

Provided are a sliding member for sealing and a seal device that exhibit good sealing performance even when used in an environment where silicon oxide is likely to be deposited; the sliding member for sealing includes a sintered body consisting of 1.0 to 12.5 wt.% of cerium oxide, a combination of 20 to 50 wt.% of graphite and graphitizable carbon, and a remainder of non-graphitizable carbon; and, the sliding member for sealing is used as, for example, a rotary seal ring or a stationary seal ring.