High-temperature self-propagating synthesis method of silicon-manganese nitride alloy

Abstract

The invention relates to a preparation method of an alloy material, in particular to a high-temperature self-propagating synthesis method of silicon-manganese nitride alloy. 75 silicon iron powder and ferromanganese iron powder are used as raw materials and are calculated and weighed according to proportion, a chemical stimulation agent is added, a uniformized and evenly-mixed power body is filled into a reaction boat, the reaction boat is put into a high-temperature self-propagating furnace to be subjected to vacuum pumping, high-purity nitrogen is led into the furnace, the pressure is controlled to be 10 MPa, and fire lighting is performed through external thermal excitation to induce local reaction. The silicon-manganese nitride alloy is obtained after reaction. The preparation method is short in technological process, low in production cost, high in reaction speed and capable of saving energy, and no hazardous substance is discharged in the whole technological process.

Description

technical field [0001] The invention relates to a preparation method of an alloy material, in particular to a high-temperature self-propagating synthesis method of a silicon-manganese nitride alloy. Background technique [0002] Silicon manganese nitride is one of the important microalloying materials. The existing patent CN 101514406A discloses a production method of silicon-manganese nitride alloy, which mainly adopts the vacuum sintering method. The silicon-manganese alloy and ferrosilicon alloy are crushed and mixed, then put into the converter, nitrogen is passed through vacuum, and heated to 200-600°C. React for 1-10 hours; the reaction product is pulverized again, mixed with iron powder, added with binder, pelletized, preliminarily sintered in the converter, fed with nitrogen, reacted for 2-10 hours, pulverized again, mixed with carbon powder, added with binder , re-balling; the pellets are heated in a vacuum sintering furnace and finally cooled to room temperature a...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: 1. The technological process is cumbersome; 2. The production cycle is long, and only the reaction process takes up to 34 hours, not counting the crushing, mixing, pelletizing and cooling processes; 3. The production cost is high and crushing is required Equipment, converters, mixers, pelletizers, vacuum sintering furnaces, etc.; 4. It is difficult to control carbon content, which can easily lead to excess carbon: the extra carbon powder added in the preparation is not easy to dissolve into the crystal lattice, resulting in free carbon enrichment. Make the steel carbon exceed the standard

The main disadvantages of this technology: (1) The reaction time is long, the production efficiency is low, and the reaction needs at least 5 hours, not counting the time of crushing, mixing and granulation. After 5 hours, it is cooled with the furnace to complete a production cycle; (2) The content is easy to exceed the standard, and the polyvinyl alcohol aqueous solution added to the mixture will decompose in large quantities at 500-600 ° C, resulting in free carbon, which makes the carbon of the steel grade exceed the standard; (3) The investment in equipment is large, and the pusher kiln equipment is expensive and the maintenance cost is high