RU2007143277A

RU2007143277A - METHOD FOR NITROGEN PRODUCTS FROM ALLOYED STEELS

Info

Publication number: RU2007143277A
Application number: RU2007143277/02A
Authority: RU
Inventors: Лариса Георгиевна Петрова (RU); Лариса Георгиевна Петрова; Владимир Алексеевич Александров (RU); Владимир Алексеевич Александров; Лариса Павловна Шестопалова (RU); Лариса Павловна Шестопалова
Priority date: 2007-11-23
Filing date: 2007-11-23
Publication date: 2009-05-27
Also published as: RU2367715C2

Abstract

Способ азотирования изделий из легированных сталей, заключающийся в диффузионном насыщении поверхности изделий азотом, которое проводят при нагреве изделий до заданной температуры насыщения в интервале 500…600°С и последующей их выдержке в насыщающей атмосфере с получением на их поверхности слоев из нитридов металлов, отличающийся тем, что нагрев изделий до заданной температуры насыщения проводят в инертной атмосфере, а перед выдержкой в насыщающей атмосфере осуществляют выдержку при той же температуре в воздушной атмосфере, формируя на их поверхности буферную зону из оксидов железа, снижающих энергию активации ионов азота, с последующим получением на поверхности металла диффузионного слоя в виде наночастиц из нитридов легирующих элементов и азота в твердом растворе альфа железа, при этом толщина буферной зоны определяется эмпирически и контролируется в процессе выдержки.The method of nitriding products from alloy steels, which consists in the diffusion saturation of the surface of the products with nitrogen, which is carried out when the products are heated to a predetermined saturation temperature in the range of 500 ... 600 ° C and their subsequent exposure to a saturating atmosphere to obtain layers of metal nitrides on their surface, characterized in that the products are heated to a predetermined saturation temperature in an inert atmosphere, and before exposure to a saturating atmosphere, exposure is carried out at the same temperature in an air atmosphere, forming and their surface, a buffer zone of iron oxides, which reduce the activation energy of nitrogen ions, followed by obtaining on the metal surface a diffusion layer in the form of nanoparticles of nitrides of alloying elements and nitrogen in a solid solution of alpha iron, while the thickness of the buffer zone is determined empirically and controlled during exposure .

Claims

The method of nitriding products from alloy steels, which consists in the diffusion saturation of the surface of the products with nitrogen, which is carried out when the products are heated to a predetermined saturation temperature in the range of 500 ... 600 ° C and their subsequent exposure to a saturating atmosphere to obtain layers of metal nitrides on their surface, characterized in that the products are heated to a predetermined saturation temperature in an inert atmosphere, and before exposure to a saturating atmosphere, exposure is carried out at the same temperature in an air atmosphere, forming and their surface, a buffer zone of iron oxides, which reduce the activation energy of nitrogen ions, followed by obtaining on the metal surface a diffusion layer in the form of nanoparticles of nitrides of alloying elements and nitrogen in a solid solution of alpha iron, while the thickness of the buffer zone is determined empirically and controlled during exposure .