CN1254454C - Cylon-corundum powdery material and its production - Google Patents

Abstract

The present invention discloses a sialon-corundum powder material with a layer of sialon phase coated on the corundum powder surface, wherein the structural formula of the sialon phase is Si(6-z)Al(z)O(z)N(8-z) (z is larger than or equal to 1 and is less than or equal to 3.5). The material has the production method that according to the amount-of-substance ratio of Si to Al to Al2O3 of 15:1:1 to 15:7:7, silicon powder, aluminum power and corundum powder are treated by ball milling under the protection of absolute alcohol for 4 to 8 hours; under the protection of nitrogen, the powder is dried at the temperature of 100 to 120 DEG C for 4 to 8 hours, and then the temperature is cooled to the room temperature; the dried powder is protected by nitrogen at the temperature of 1200 to 1300DEGC, the temperature is preserved for 6 to 12 hours, and the sialon-corundum powder material with the powder grain size of less than 0.088mm is obtained. The present invention has the characteristics of high sialon intensity, good thermal shock resistance, good alkali metal resistance property and strong anti-oxidation property of the corundum, and can be widely applied to high-temperature furnace spraying liners, special ceramics, hot engines and other relevant fields.

Description

Sialon-corundum powder body material and production method thereof

Technical field

The present invention relates to the material field, relate in particular to a kind of Sialon-corundum powder body material, also relate to its production method.

Background technology

That Sialon has is high-strength, high hard, low-thermal-expansion, anti-oxidant and characteristics that creep-resistant property is superior, but its alkali resistant metal attack poor-performing; Though corundum has good alkali resistant metal attack performance, its thermal expansivity is big and heat-shock resistance is very poor.

It is that raw material is in high-purity N that the production method of present Sialon-corundum material mainly adopts with silica flour, aluminium powder, aluminum oxide powder, corundum in granules ₂(N ₂〉=99.99%), temperature is 1420-1650 ℃ reacts, and sintering belongs to liquid phase sintering.What make is to be aggregate with the corundum in granules, and Sialon is the middle block materials that links phase, makes this block materials easily be damaged in being subjected to thermal process.

Summary of the invention

The object of the present invention is to provide a kind of intensity height, good thermal shock, alkali resistant metal attack performance is good, antioxidant property is strong Sialon-corundum powder body material.

Another object of the present invention is to provide the production method of Sialon-corundum powder body material.

The compound that Sialon is made up of silicon (Si), aluminium (Al), oxygen (O), nitrogen (N), it is Si ₃N ₄In Si and N by Al or (Al+M) (M is a metal ion) and O replace the general name of formed one big class sosoloid, by the difference of replacement amount, Sialon is divided into α-Sialon again according to Si, N, beta-Sialon, O-Sialon and X-Sialon.

Sialon-corundum powder body material of the present invention, the solid state reaction that generates the Sialon phase is carried out on the surface of corundum powder, obtains structure and is wrapped in one deck Sialon phase for the lapis amiridis surface, and the structural formula of its Sialon phase is Si _6-zAl _zO _zN _8-z(1≤z≤3.5), wherein Sialon is the beta-Sialon phase mutually.

The production method of Sialon-corundum powder body material of the present invention may further comprise the steps:

(1) be 120-180 purpose silica flour with Si 〉=98.5%, fineness, Al 〉=99.5%, fineness are 100-200 purpose aluminium powder, Al ₂O ₃〉=98.5%, fineness is a 120-180 purpose lapis amiridis, and its weight ratio is Si: Al: Al ₂O ₃=15: 1: 1-15: 7: 7, under dehydrated alcohol protection ball milling 4-8 hour;

(2) use N ₂〉=99.0% nitrogen protection at 100-120 ℃ of dry 4-8 hour, is cooled to room temperature;

(3) with dried powder N ₂〉=99.0% nitrogen protection is incubated 6-12 hour down at 1200-1300 ℃, promptly obtains the Sialon-corundum powder body material of diameter of particle＜0.088mm.

The production method of Sialon-corundum powder body material of the present invention, wherein the amount of Sialon phase is by dosage and reaction conditions decision.。

The present invention has replaced the present Sialon-corundum material aluminum oxide powder in producing with lapis amiridis, at nitrogen (N ₂〉=99.0%) protection is passed through solid state reaction down at 1200-1300 ℃ down, and Sialon is generated on the surface of corundum powder, and what obtain is the Sialon-corundum powder body material that the lapis amiridis surface is wrapped in one deck Sialon phase.This material had both been had the intensity height of Sialon, characteristics of good thermal shock, had the characteristics that the alkali resistant metallicity is good, antioxidant property is strong of corundum again concurrently, therefore, can be widely used in High Temperature Furnaces Heating Apparatus spraying liner, special cermacis, heat engine and other association areas.

Embodiment

Further specify Sialon-corundum powder body material of the present invention with specific embodiment below, its structural formula is Si ₃Al ₃O ₃N ₅Production method.

The production method of Sialon-corundum powder body material of the present invention may further comprise the steps:

(1) with Si 〉=98.5%, fineness be 120-180 purpose silica flour 28.3g, Al 〉=99.5%, fineness are 100-200 purpose aluminium powder 4.5g, Al ₂O ₃〉=98.5%, fineness be 120-180 purpose lapis amiridis 17.2g in the agate jar, add dehydrated alcohol 200ml, ball milling 4 hours;

(2) use N ₂〉=99.0% nitrogen protection 120 ℃ of dryings 6 hours, is cooled to room temperature;

(3) with dried powder N ₂〉=99.0% nitrogen protection is incubated 6 hours down at 1250 ℃, promptly obtains the Sialon-corundum powder body material of diameter of particle＜0.088mm, and wherein 80% lapis amiridis is wrapped up mutually by Sialon.

Claims (3)

1, a kind of Sialon-corundum powder body material is characterized in that the solid state reaction that generates the Sialon phase carries out on the surface of corundum powder, obtains structure and is wrapped in one deck Sialon phase for the lapis amiridis surface, and the structural formula of its Sialon phase is Si _6-zAl _zO _zN _8-z:

Wherein: 1≤z≤3.5.

2, material as claimed in claim 1, wherein Sialon is the beta-Sialon phase mutually.

3, the production method of Sialon-corundum powder body material as claimed in claim 1 or 2 may further comprise the steps:

(1) be 120-180 purpose silica flour with Si 〉=98.5%, fineness, Al 〉=99.5%, fineness are 100-200 purpose aluminium powder, Al ₂O ₃〉=98.5%, fineness is a 120-180 purpose lapis amiridis, and its weight ratio is Si: Al: Al ₂O ₃=15: 1: 1-15: 7: 7, under dehydrated alcohol protection ball milling 4-8 hour;

(2) use N ₂〉=99.0% nitrogen protection at 100-120 ℃ of dry 4-8 hour, is cooled to room temperature;

(3) with dried powder N ₂〉=99.0% nitrogen protection is incubated 6-12 hour down at 1200-1300 ℃, promptly obtains the Sialon-corundum powder body material of diameter of particle＜0.088mm.