Boronizing Reaction Gas Protective Atmosphere

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Solution Overview

Problem

Boronizing processes for metal articles face challenges such as oxidation and scaling of metal surfaces due to oxygen exposure, leading to structural integrity issues and environmental hazards from halide gas emissions, particularly in harsh environments like oil and gas drilling.

Innovation Solution

The use of boronizing reaction gases as a protective atmosphere to prevent oxidation and scaling, combined with a process to neutralize these gases and reduce halide emissions by flowing spent boronizing reaction gases through absorbent materials before release.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional boronizing processes are used in air atmosphere, then boronizing treatment can be applied to metal surfaces, but oxidation and scaling of metal surfaces occur leading to structural integrity issues

Engineering Contradiction:

Improvestructural integrityVSAvoidoxidation and scaling

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies the inert atmosphere principle by using boronizing reaction gases (such as BF3, BCl3) to create a protective atmosphere during the boronizing process. These gases displace oxygen in the treatment environment, preventing oxidation and scaling of metal surfaces while maintaining the structural integrity of the workpiece. The reaction gases form an oxygen-depleted environment that protects the metal surface from harmful oxidative effects.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent uses boronizing reaction gases as an intermediary substance between the metal surface and oxygen. These gases act as a mediator that prevents direct contact between oxygen and the metal surface, thereby preventing oxidation. The reaction gases serve as a protective barrier that allows the boronizing treatment to proceed without the harmful effects of air atmosphere.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If boronizing reaction gases are released directly into the environment, then the boronizing process can proceed, but halide gas emissions cause environmental hazards

Engineering Contradiction:

Improveboronizing process efficiencyVSAvoidhalide gas emissions

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful halide gas emissions into a beneficial protective atmosphere. The boronizing reaction gases that would normally be waste products are instead utilized to create an oxygen-depleted environment that protects metal surfaces from oxidation. This principle transforms the harmful emissions into a useful functional element of the process, simultaneously improving productivity and reducing environmental impact.

Inventive Principle:

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

Solution Approach 2:

The patent recovers and reuses boronizing reaction gases that would otherwise be discarded into the environment. Instead of releasing halide gases directly, the system captures these gases and redirects them to serve as a protective atmosphere within the treatment chamber. This recovery approach maintains process efficiency while eliminating environmental hazards associated with halide gas emissions.

Inventive Principle:

Principle #34Discarding and recovering

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 approach effectively prevents oxidation and scaling of metal surfaces, maintains structural integrity, and minimizes environmental impact by neutralizing harmful gases, making the boronizing process more environmentally safe and efficient.

Implementation Method 1

the spent boronizing reaction gases are flowed into the atmosphere surrounding the outside surface of the pipe, thereby forming an oxygen-depleted atmosphere

Methodology Applied

Scientific EffectGas displacement:

Implementation Method 2

The pipe is then heated in a vessel having an interior, to a boriding temperature, thereby forming spent boronizing reaction gases and a borided layer on the inside surface

Methodology Applied

Scientific EffectThermal diffusion: Diffusion

Data Source

PatentUS10870912B2Method for using boronizing reaction gases as a protective atmosphere during boronizing, and reaction gas neutralizing treatment

Publication Date: 2020.12.22 BWT LLC

AI summary

A process comprising:placing a boronizing powder composition in the interior of a metal pipe comprising a first end, a second end, an inside surface and an outside surface;heating the pipe in a vessel having an interior, to a temperature from 1400° F. to 1900° F., thereby forming spent boronizing reaction gases and a borided layer on the inside surface,wherein the vessel interior has an atmosphere that surrounds the outside surface of the metal pipe; andflowing the spent boronizing reaction gases into the atmosphere surrounding the outside surface of the pipe, thereby forming an oxygen-depleted atmosphere.