The endothermic atmosphere is a controlled environment created by passing a hydrocarbon gas and air mixture through a converter or generator containing a catalyst at high temperatures.
This process results in an atmosphere that absorbs heat, hence the term "endothermic," which refers to chemical reactions that consume heat.
Summary of the Answer:
The endothermic atmosphere is a heat-absorbing environment produced by the incomplete combustion of hydrocarbon gases and air in the presence of a catalyst.
It is characterized by a specific composition including nitrogen, hydrogen, carbon monoxide, and small amounts of water vapor and carbon dioxide.
This atmosphere is highly adaptable and can be adjusted to suit various heat treatment processes such as sintering, bright hardening, and annealing.
Detailed Explanation:
1. Preparation and Composition:
The endothermic atmosphere is formed by the incomplete combustion of a hydrocarbon gas (like methane or propane) mixed with air, which is less than or equal to half of the theoretical air requirements.
This mixture is processed at high temperatures in the presence of a catalyst.
The typical composition includes approximately 39% nitrogen, 20% carbon monoxide, and 39% hydrogen, along with minor constituents like water vapor, carbon dioxide, and residual methane.
2. Functionality and Adjustability:
The key advantage of endothermic atmospheres is their flexibility and adjustability.
By varying the ratio of air to raw gas, the relative amounts of components like CO, CO2, H2, H2O, and CH4 can be controlled.
This allows for the adjustment of the carbon potential, making the atmosphere suitable for various heat treatment processes.
The external heat supply is crucial for maintaining the reaction, as the mixture itself generates insufficient heat to sustain continuous combustion.
3. Applications:
Endothermic atmospheres are widely used in industrial processes where a reducing environment is beneficial, such as in sintering, bright hardening, and annealing of non-ferrous metals.
They are also utilized in brazing and carbon restoration in metal parts.
The American Gas Association has classified these atmospheres to standardize their use in different industrial applications.
4. Distinction from Exothermic Atmospheres:
Unlike endothermic atmospheres, which require external heat to initiate and sustain the reaction, exothermic atmospheres release heat during reactions.
Exothermic atmospheres are not typically used in heat treatment processes but are instead employed when deliberate surface oxidation is needed, such as in copper annealing.
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