Combustion synthesis of porous ceramic β- Si3N4 -based composites with the use of ferroalloys

Болгару, К. А.; Reger, Anton; Верещагин, В. И.; Akulinkin, A. A.

doi:10.1016/j.ceramint.2021.09.015

Cited by 13 publications

(2 citation statements)

References 27 publications

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“…Сложными ферросплавами являются сплавы железа с двумя и более элементами. На данный момент изучено СВС горение ферросиликоалюминия [25] и ферроалюмосиликоциркония [2].…”

Section: Introductionunclassified

Physical and chemical processes during nitriding of chromium ferrosilicon by filtration combustion

Bolgaru,

Reger,

Vereshchagin

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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In this paper, the nitriding of chromium ferrosilicon is carried out in the combustion mode under the condition of natural nitrogen filtration. The authors studied the effect of the key parameters (pressure of gaseous nitrogen, diameter and dispersity of starting samples) on the maximum temperature and combustion of the starting powder mixture based on chromium ferrosilicon. The combustion synthesis of chromium ferrosilicon proceeds steadily in the stationary mode with formation of a macrohomogeneous nitrided composition which, according to the results of X-ray phase analysis, contains two nitride phases - chromium nitride and silicon nitride. Interaction of the initial powder with gaseous nitrogen in the filtration combustion mode proceeds by the following probable chemical reaction: 3CrSi2 + 3Si + 3FeSi2 + 11.5N2 = 3CrN + 5Si3N4 + 3Fe. Increasing the diameter of the starting samples slightly affects the amount of absorbed nitrogen and slows the propagation of the combustion wave front. An increase in the pressure of gaseous nitrogen increases the amount of absorbed nitrogen and the combustion rate. Increasing the dispersity of the starting powder increases the amount of absorbed nitrogen and the combustion rate. It was found that the combustion reaction is not possible with a dense initial sample. The maximum combustion temperature, depending on the nitriding conditions, varies between 2400 and 2650 °C and increases with increasing gaseous nitrogen pressure, diameter of the initial samples and dispersion of chromium ferrosilicon powder. It is possible to realise nitriding of chrome ferrosilicon in the combustion mode at the pressure of gaseous nitrogen not less than 3 MPa, diameter of initial samples not less than 3.5 cm and size of initial particles not more than 100 μm. Optimal parameters of nitriding are gaseous nitrogen pressure of 5 MPa, diameter of samples 5 cm, size of initial particles less than 100 μm and bulk density of samples (2.23 g/cm3).

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Section: Introductionunclassified

Physical and chemical processes during nitriding of chromium ferrosilicon by filtration combustion

Bolgaru,

Reger,

Vereshchagin

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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“…Compared with industrial silicon powder, silicon nitride has preferable chemical stability and physical properties in applications [ 2 ]. However, in the production methods [ 6 , 7 , 8 , 9 ] of silicon nitride materials, Si 3 N 4 powder is generated as a by-product by crushing the lump. Meanwhile, the application of industrial silicon powder, such as the production of Si-Fe alloys [ 10 , 11 , 12 ] by using a submerged arc furnace, has a considerable powder emission with off-gas.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method of Si and Si3N4 Powder Resources Recycling: Cold Bonding Briquettes

Xiong

Chen

et al. 2022

Materials

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Silicon nitride (Si3N4) and silicon powder (Si) are two kinds of harmful solid waste in industrial production. As an environmental and low-consumption method, the cold-bonding technique is a novel method to utilize the problem of powder resource cycling. In this experiment, mechanical and high-temperature properties of Si and Si3N4 briquettes were studied after cold bonding. The results are as follows: (1) The compressive strength of the Si and Si3N4 briquettes increased with the improvement of molding pressure. With the same binder (1 wt.%) and water (10 wt.%) addition, the compressive strength of the Si3N4 briquette arrived at 12,023.53 N under 40 Mpa molding pressure, which is much higher than that of the Si briquette (942.40 N). The Si particles are uneven and irregular, which leads to an intense arch bridge effect in the Si briquette and the compressive strength decrease. Compared with Si powder, the particle size and shape of Si3N4 is small, uniform, and regular. The influence of the arch bridge effect is smaller than that in the Si briquette. (2) After being treated at 1473 K for 1 h, the compressive strength of the Si briquette increased to 5049.83 N, and the compressive strength of the Si3N4 briquette had a slight change. The surface of the briquettes was contacted with oxygen and reacted to form an outer shell which mainly contains SiO2 in the high-temperature treatment. FT-IR results have shown there were no extra impurities in cold-bonded briquettes when using the organic binder. (3) The microstructure of the cross section of the Si and Si3N4 briquettes after high-temperature treatment presented that oxygen entered the briquette through the pores and continued to react with the Si and Si3N4. The outer shell of the Si briquette grew and thickened continuously with the oxygen spreading in the Si briquette. However, because of the smaller particle size and regular shape, little oxygen diffused in the Si3N4 briquette. The outer shell of the Si3N4 briquette is fairly thin, so the compressive strength did not change too much.

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A novel synthesis approach of Si2N2O based wave-transparent ceramics combined with a gel-casting process

Mao

Yin

et al. 2023

J Sol-Gel Sci Technol

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Combustion synthesis of porous ceramic β- Si3N4 -based composites with the use of ferroalloys

Cited by 13 publications

References 27 publications

Physical and chemical processes during nitriding of chromium ferrosilicon by filtration combustion

Physical and chemical processes during nitriding of chromium ferrosilicon by filtration combustion

A Novel Method of Si and Si3N4 Powder Resources Recycling: Cold Bonding Briquettes

A novel synthesis approach of Si2N2O based wave-transparent ceramics combined with a gel-casting process

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