Surface hardening treatment device and surface hardening treatment method
US11155891B2 · kind B2 · utility
1Cited by
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8Claims
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Key dates
| Filing date | Jul 6, 2018 |
| Grant date | Oct 26, 2021 |
| Priority date | — |
| Expiry date | Dec 10, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Based on the nitriding potential in the processing furnace calculated by the in-furnace nitriding potential calculator and a target nitriding potential, an introduction amount of each of the plurality of furnace introduction gases is controlled by changing a flow rate ratio between the plurality of furnace introduction gases while keeping a total introduction amount of the plurality of furnace introduction gases constant, such that the nitriding potential in the processing furnace is brought close to the target nitriding potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.