RU186172U1 - DIFFUSION ALLOYING DEVICE - Google Patents

Abstract

The utility model relates to heat treatment and can be used to implement the process of thermal diffusion hardening of cast irons by heating in contact with oxides of alloying elements. The task to be solved by the claimed utility model is to create a device that enables the effective implementation of the process of thermal diffusion hardening of cast irons by heating in contact with oxides of alloying elements with a minimum number of defects of the diffusion layer. Technical result: Pre The laid-down device allows you to effectively implement the process of thermal diffusion hardening of gray cast iron products in any furnace due to the fact that the design of the device provides for inserts of graphite, which oxidize, emit CO gas, thereby creating a reducing atmosphere. The essence of the utility model: A device for diffusion alloying containing a box, which is closed by a lid, characterized in that the walls of the box are made in the form of a combination of layers of metal, graphite and insulating gaskets, one of which x is made porous.

Description

The utility model relates to heat treatment and can be used in the process of thermal diffusion alloying of cast iron by heating in contact with oxides of alloying elements.

The closest analogue in terms of essential features is the device (RU No. 44674, 11/05/2004, C21D 1/00).

This device is used for thermal and chemical-thermal treatment of products and makes it possible, for example, to perform cementation with subsequent hardening without the need to remove parts from the device. This scheme is implemented through the use of fusible inserts.

The disadvantages of the above device include the following:

- the use of fusible inserts necessitates an additional operation to remove residual inserts from the holes;

- this device does not provide the creation of a reducing atmosphere, and, therefore, the suitability for the use of the design in question when implementing the process of thermal diffusion hardening of cast irons by heating in contact with oxides of alloying elements is limited (it is necessary to use special furnaces where it is possible to create a reducing atmosphere additionally).

The task to which the claimed utility model is directed is to create a device that enables the effective implementation of the thermal diffusion alloying of cast irons by heating in contact with the oxides of alloying elements with a minimum number of defects of the diffusion layer.

When implementing a utility model, the problem can be solved by achieving a technical result, which consists in creating a reducing atmosphere.

The implementation scheme of the utility model (Fig. 1) includes a metal box 4, which is closed by a lid 1. The box is lined with plates of graphite 3, which, when oxidized, form a reducing atmosphere of carbon monoxide. Graphite plates are isolated from the box 4 and parts 6 by means of gaskets 5 and 2. Moreover, one of the gaskets is made porous (gasket 2), so that the CO gas enters the core. Gaskets are used to prevent the process from melting parts and the box from contact with graphite plane trees. Inside the box, oxide of the alloying element is poured.

Claims (1)

A device for thermal diffusion alloying of parts made of cast iron, made in the form of a metal box with a lid, characterized in that the walls of the metal box are lined with graphite plates, which are insulated from the box walls by spacers located in layers, one of which is made porous to form a reducing atmosphere from CO gas in the active zone of the box, inside which the oxide of the alloying element is filled.

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