Steel Piston Blank Composition for Scaling Resistance at High Temperatures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pistons for internal combustion engines face limitations in increasing combustion chamber surface temperature due to limited resistance to scaling, which can lead to scaling-related cracking and failure, hindering improvements in thermodynamic efficiency and emissions reduction.
Innovation Solution
A piston blank made from a steel alloy with specific chromium and silicon content, combined with design features like increased wall thickness and reduced thermal conductivity, enhances resistance to scaling and allows for higher combustion chamber surface temperatures, thereby improving thermodynamic efficiency and reducing fuel consumption and CO2 emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the combustion chamber surface temperature is increased to improve thermodynamic efficiency, then fuel consumption and CO2 emissions are reduced, but scaling-related cracking and piston failure occur due to limited resistance to scaling
Solution Approach 1:
The patent changes the chemical composition parameters of the steel alloy by specifying a chromium content of 0.5 to 2 percent by weight and a silicon content of 2.5 to 3.5 percent by weight. This parameter change fundamentally alters the material's properties, enabling it to withstand higher combustion chamber surface temperatures without scaling-related failure, thus resolving the contradiction between improving thermodynamic efficiency and maintaining reliability
Solution Approach 2:
The patent employs a composite steel alloy material that combines multiple elements (chromium, silicon, and other alloying elements) to create a material with superior high-temperature scale resistance. This composite material approach allows the piston to operate at higher temperatures for improved efficiency while the alloy composition provides inherent protection against scaling and cracking
2Device complexity
If conventional steel alloys are used with standard cooling systems, then the piston structure is simpler and manufacturing is easier, but the combustion chamber surface temperature cannot be increased further due to scaling limitations
Solution Approach 1:
The patent changes the material parameters by using a steel alloy with specific chromium (0.5-2 wt%) and silicon (2.5-3.5 wt%) content, which fundamentally alters the temperature capability of the piston. This material parameter change enables higher combustion chamber surface temperatures without requiring complex active cooling systems, as the alloy itself provides high-temperature resistance
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 enables increased combustion chamber surface temperature, enhancing thermodynamic efficiency and meeting stricter emissions standards by preventing scaling-induced failures and optimizing heat dissipation.
Implementation Method 1
the steel alloy is particularly resistant to scaling... the combustion chamber surface temperature of a piston made from the piston blank can be increased without the piston scaling
Implementation Method 2
the piston blank can also differ from the piston in that a piston lower part of the piston blank and a piston upper part of the piston blank are not yet firmly connected to each other... designed with increased wall thickness and reduced thermal conductivity
Data Source
AI summary
A piston blank (39) for a piston (8) for use in an internal combustion engine. The piston blank (39) is manufactured at least in sections from a steel alloy which includes a chromium content of 0.5 to 2 percent by weight and a silicon content of 2.5 to 3.5 percent by weight.