CN101613853B

CN101613853B - Preparation device of iron and nitrogen powder metallurgy material

Info

Publication number: CN101613853B
Application number: CN2009100601182A
Authority: CN
Inventors: 杨川; 崔国栋; 高国庆; 吴大兴
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2009-07-27
Filing date: 2009-07-27
Publication date: 2010-11-03
Anticipated expiration: 2029-07-27
Also published as: CN101613853A

Abstract

The invention discloses a preparation device of iron and nitrogen powder metallurgy material, which is applied to nitrogen treatment of iron-based powder for obtaining Fe3N powder material for preparing intermediate material of Fe-N-Ni-P compound powder; a stainless steel working studio 1 is arranged in the main structure of a pipe-type thermal treatment furnace; one end of the stainless steel working studio is provided with a agitation blower 2, and the other end thereof is provided with a vent-pipe 3 communicated with the outside of a furnace body. An air inlet communicated with an externaltreatment air source is arranged near the agitation blower, a quartz glass powder treatment chamber 4 arranged in the stainless steel studio comprises a powder treatment tube 5, an air inlet pipe mouth 6 and an air outlet 7. The device of the invention features uniform distribution of treatment gas in the studio, not only ensures effective contact between the powder and the treatment gas but alsoensures stable control over material flow direction of the powder without causing upward movement of the powder.

Description

Preparation device of iron and nitrogen powder metallurgy material

Technical field

The invention belongs to mmaterial and prepare the manufacturing field,, the while relevant with power metallurgy equipment and Controlling System is correlated with the equipment of process for treating surface such as carburizing, nitriding.

Prior art

Powder with Fe-N (but solid solution small amount of carbon) structure, utilize powder metallurgy process to manufacture the powder metallurgy block materials, the conventional iron-base powder metallurgy material of weight ratio alleviates 20%, therefore hardness wear resisting property, corrosion resistance have the applications well prospect at automobile, machinery, metallurgy industry far above present iron-base powder metallurgy material.Simultaneously, this novel iron and nitrogen powder metallurgy material has special magnetic performance, at electronic information field special purpose is arranged also.The Fe-N powdered material is the intermediate raw material of the special powder body material of preparation Fe-N-Ni-P simultaneously.The special powder of Fe-N-Ni-P is a kind of special porous material, and good magnetic performance is arranged.To obtain Fe at present ₃The nitriding treatment of N structure powder material is that conventional equipment can't effectively be realized.

Summary of the invention

In view of the above deficiency of prior art, the objective of the invention is to design a kind of iron-based powder nitriding treatment that is used for, to obtain to be used for the Fe that the later stage prepares the intermediate raw material of Fe-N-Ni-P composite granule ₃The device of N powder body material makes it can finish special nitriding treatment to powder.The objective of the invention is to realize by following means.

A kind of preparation device of iron and nitrogen powder metallurgy material is used for the iron-based powder nitriding treatment, to obtain to be used for the Fe that the later stage prepares the intermediate raw material of Fe-N-Ni-P composite granule ₃The N powder body material; In the agent structure of tubular type heat treatment furnace, comprise: a stainless steel working spaces 1, one end of described stainless steel working spaces has a gas delivery mechanism, and its other end has the vapor pipe with the body of heater exterior, is provided with near the described gas delivery mechanism with extraneous and handles the inlet mouth that source of the gas communicates; One is arranged on the quartz glass powder treating chamber in the stainless steel working spaces, and described quartz glass powder treating chamber comprises powder treatment pipe, the air inlet mouth of pipe, venting port.

After adopting design as above, handle gas and in the working spaces, be evenly distributed, both guaranteed powder with handle gas effective the contact, guaranteed again the stable control of the powder material flow direction do not had and raised up.On the other hand, this appliance ensure fully contacting of powder and gas, in the process that contacts of powder and gas, because the surface-area of powder is very big, adsorbed active gas atom, these active atoms just penetrate into powder under the effect of temperature inside and iron atom react, and original iron atom character is changed.Radical change has taken place in the iron powder character of handling through this device.Different with ratio according to the gaseous constituent that feeds, iron powder has become iron nitrogen powder.With the mmaterial that such iron nitrogen powdered preparation goes out, just possess and the diverse special performance of iron powder.

Description of drawings is as follows:

Fig. 1 is the sectional view of preparation device of iron and nitrogen powder metallurgy material oven body part of the present invention and the general arrangement of iron and nitrogen powder metallurgy material preparation of the present invention.

Fig. 2 is embodiment 2 gained iron nitrogen x-ray diffractogram of powder.

Fig. 3 is embodiment 2 gained iron nitrogen powder morphology photos.

Below in conjunction with accompanying drawing structure of the present invention is further introduced.

As shown in Figure 1, the present invention has the agent structure of the horizontal body of heater of conventional duct type, and include a stainless steel working spaces 1, one end of described stainless steel working spaces has a gas delivery mechanism 2, its the other end has the vapor pipe 3 with the body of heater exterior, is provided with near the described gas delivery mechanism with extraneous and handles the inlet mouth that source of the gas communicates; Also include a quartz glass powder treating chamber 4 that is arranged in the stainless steel working spaces, described quartz glass powder treating chamber comprises powder treatment pipe 5, the air inlet mouth of pipe 6, venting port 7.One end of stainless steel working spaces also is provided with the end cap 8 that is used to pick and place the quartz glass powder treating chamber.9 is the body of heater shell among the figure, and 10 is thermal insulation layer, and 11 for adding heat radiation layer.12,13,14 is thermopair; 15,16,17 for handling the inlet mouth that source of the gas communicates with the external world.

Embodiment 1

Device is welded into shell 9 by the Q235 steel, and the garden type thermal insulation layer 10 that insulating brick constitutes is equipped with in inside, places a stainless steel cylinder as working spaces 1 in thermal insulation layer.One end of working spaces is installed and is stirred blower fan, and the other end has end cap 8, and there is viton seal ring 1 of end cap and working spaces.The heat radiation layer of adding 11 is arranged between thermal insulation layer 10 and working spaces.The quartz glass powder treating chamber is drawn together powder treatment pipe 5, the bucket shape air inlet mouth of pipe 6, venting port 7.The size that choice of powder is handled pipe 5 is: diameter 50mm, length 200mm. straight iron powder 500 grams of packing into inside. with this silica tube 1 working spaces 1 of packing into, the working spaces is of a size of: diameter 100mm, length 600mm..

Effect embodiment 2

At first iron powder is packed in the powder treatment pipe 5, the powder treatment pipe 5 of the powder of will packing into is put into 1 inside, tubular type stainless steel working spaces.According to processing requirement, in industrial computer, set temperature and the gas feeding amount that requires.Connect power supply, the radiator tube evolution of heat is heated quartz pipe, simultaneously iron powder is heated.In order to guarantee that temperature accurately controls, adopt three thermocouple measurement temperature.Thermopair passes to computer with signal, if temperature is higher than assigned temperature, software commander control intelligence instrument is cut off the electricity supply, if temperature is lower than assigned temperature, software commander intelligence instrument is connected power supply, thereby realization powder Heating temperature is accurately controlled.

When inner powder is heated to certain temperature, pressure loading valve on ammonia bottle, argon bottle, the CO2 gas cylinder is opened.Feed ammonia, argon gas, CO2 gas (gas ratio requires different according to different performance) according to a certain percentage, there is the whirlpool to connect the gas flow meter difference pilot-gas flow of under meter by inside, vortex street sensor is passed to intelligence instrument and industrial computer with signal, the motorized valve of software commander gas flow control device inside opens and closes valve, pilot-gas flow.

Enter the gas of stainless steel working spaces 1, under the effect of blower fan, gas passes through inlet mouth 6 from silica tube 1, enters powder treatment pipe 5 inside, fully contacts the back with powder and ejects from exhaust pipe mouth 7.The gas that is excluded is discharged the waste gas body ignition that is excluded, environmentally safe through the gas exhaust duct above the stainless steel working spaces.

Temperature is set at 650 degree; The ammonia that feeds: 0.01 cubic metre/hour; 0.03 cubic metre/hour of argon gas; 0.005 cubic metre/hour of CO2 gas.Opening blower fan stirs.100 watts of power of fan; 5 kilowatts of heating powers.40 minutes heat-up times of whole process.The iron nitrogen powder that obtains adopts the X diffraction method to carry out structural analysis (Fig. 2), can see that the iron nitrogen powder that is obtained is Fe ₃The N structure.Iron nitrogen powder morphology such as Fig. 3, the one-tenth block of material of making is good than hardness height, corrosion resistance nature and the electromagnetic performance of conventional powder.

Claims

1. Iron-nitrogen powder metallurgy material preparation device, used for iron-based powder nitriding treatment to obtain Fe ₃ N powder material used as intermediate raw material for preparing Fe-N-Ni-P composite powder in the later stage; in tubular heat treatment main structure of the furnace, and contains

A stainless steel working chamber (1), one end of the stainless steel working chamber has a gas conveying mechanism (2), and its other end has an exhaust pipe (3) communicated with the outside of the body of furnace, and the vicinity of the gas conveying mechanism is provided with a The air inlet connected to the external processing air source;

A quartz glass powder processing chamber (4) arranged in a stainless steel working chamber, said quartz glass powder processing chamber comprising a powder processing pipe (5), an air inlet nozzle (6), and an exhaust port (7);

The gas conveying mechanism (2) is a fan, which is arranged on the stainless steel working chamber on the same side as the inlet pipe opening (6); the air inlet pipe opening (6) is bucket-shaped.