Gas Generating Composition Slag Formation
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Solution Overview
Problem
Existing non-azide gas generating compositions for airbag systems produce residues that can become mist, increasing the need for filters and are not cost-effective due to the use of glass powder, which raises weight and expense concerns.
Innovation Solution
A gas generating composition comprising a fuel, an oxidizer, and a phosphoric acid compound or its salt, which solidifies combustion residues and reduces NOx and CO emissions, similar to glass powder methods but with reduced weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If glass powder is added to lower combustion temperature and decrease NOx content, then the content of NOx and CO is decreased, but the weight of the gas generator is increased and cost increases
Solution Approach 1:
The patent changes the chemical composition parameter by using phosphoric acid compounds or salts instead of glass powder. This substitution maintains the ability to form solid slag and reduce harmful emissions while changing the material properties to achieve lower weight and cost.
Solution Approach 2:
The patent employs phosphoric acid compounds or salts as a cost-effective alternative to expensive glass powder. These compounds provide the necessary slag-forming capability at lower cost and weight, making them suitable for disposable gas generating compositions.
2Object-generated harmful factors
If glass powder is added to lower combustion temperature and decrease NOx content, then the content of NOx and CO is decreased, but the cost increases
Solution Approach 1:
The patent employs phosphoric acid compounds or salts as a cost-effective alternative to expensive glass powder. These compounds provide the necessary slag-forming capability at lower cost and weight, making them suitable for disposable gas generating compositions.
Solution Approach 2:
The patent changes the chemical composition parameter by using phosphoric acid compounds or salts instead of glass powder. This substitution maintains the ability to form solid slag and reduce harmful emissions while changing the material properties to achieve lower weight and cost.
3Object-affected harmful factors
If non-azide gas generating compositions are used to reduce toxicity, then safety is improved, but residue mist is generated requiring filters
Solution Approach 1:
The patent converts the harmful residue mist into beneficial solid slag through the addition of phosphoric acid compounds or salts. These compounds promote slag formation that traps and solidifies combustion residues, preventing mist generation while maintaining the low toxicity advantage of non-azide compositions.
Solution Approach 2:
The patent changes the combustion product state parameter by promoting solid slag formation instead of mist. The phosphoric acid compounds or salts modify the combustion chemistry to produce solid residues that are easily trapped by filters, converting the harmful mist effect into a beneficial solid residue.
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 composition effectively forms a slag from combustion residues, reducing mist formation and lowering NOx and CO levels, while offering a cost-effective and lightweight alternative to glass powder methods.
Implementation Method 1
a phosphoric acid compound or a salt thereof; thus, the combustion residue does not become mist discharged outside of the inflator because the combustion residue is solidified and forms a slag
Implementation Method 2
combustion with the above non-azide gas generating compositions
Data Source
AI summary
A gas generating composition that can suppress the generation of mist is provided. The above gas generating composition comprises (a) a fuel, (b) an oxidizer, and (c) a compound selected from a group comprising a phosphoric acid compound or a salt thereof. The content ratio of (c) in the above composition is preferably 0.1 to 5 mass %.