LOW PRESSURE CARBONITRIDING METHOD AND FURNACE

• Main Authors: GIRAUD YVES, MULIN HUBERT
• Format: Patent
• Language: English; Korean
• Published: 16.08.2017
• Subjects: BLASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FURNACES; FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; KILNS; LIGHTING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; OPEN SINTERING OR LIKE APPARATUS; OVENS; RETORTS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; WEAPONS

본 발명은 제1 단계들 및 제2 단계들을 포함하되, 침탄 가스는 제1 단계들 동안에만 챔버에 주입되고, 질화 가스는 제2 단계들 동안에만 챔버에 주입되며, 제2 단계들 중 적어도 1회는 2회의 제1 단계들 사이에 진행되고, 상기 2회의 제1 단계들 중 적어도 일부 동안의 챔버 내 압력은 제1의 값으로 유지되며, 상기 2회의 제1 단계들 사이에 진행되는 상기 제2 단계의 적어도 일부 동안의 챔버 내 압력은 상기 제1의 값보다 절대적으로 큰 제2의 값인, 챔버 내에 정렬된 강철 부품을 침탄 질화하는 방법에 관한다. A method for carbonitriding of a steel part arranged in a chamber comprises first steps and second steps, a carburizing gas being injected into the chamber during the first steps only and a nitriding gas being injected into the chamber during the second steps only, at least one of the second steps being situated between two first steps, the pressure in the chamber during at least one part of said two first steps being maintained at a first value and the pressure in the chamber during at least one part of said second step situated between said two first steps being at a second value that is strictly greater than the first value.