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Process for preparation of self-spread high-temperature synthesizing low-cost diphase alpha/beta-sialon powder

A low-cost, self-propagating technology, used in the field of high-temperature self-propagating process synthesis powder, low-cost synthesis of complex α/β-sialon powder, can solve the problem of high cost, achieve loose structure, reduce impurity content, The effect of reducing production costs

Inactive Publication Date: 2007-03-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these patents involves the preparation of α / β-Sialon powder, and the cost is relatively high. The former patent uses more expensive materials such as aluminum nitride, and the latter patent involves adding more expensive nitrogen. Aluminum powder

Method used

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  • Process for preparation of self-spread high-temperature synthesizing low-cost diphase alpha/beta-sialon powder
  • Process for preparation of self-spread high-temperature synthesizing low-cost diphase alpha/beta-sialon powder
  • Process for preparation of self-spread high-temperature synthesizing low-cost diphase alpha/beta-sialon powder

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Using blast furnace slag, metallic silicon powder, and aluminum powder of a steel plant as raw materials, and adding a small amount of Sialon powder synthesized by the present invention, considering the chemical composition of the slag (Table 1), the composition of α-Sialon is based on Ca 0.71 Mg 0.23 Si 9.18 Al 2.82 o 0.94 N 15.06 Design, the composition of β-Sialon is according to SiO in silicon, aluminum and slag 2 and Al 2 o 3volume design. The raw materials prepared according to this component are mixed with silicon nitride balls as the medium in a nylon barrel, and after 24 hours of dry-mixed ball milling, they are loosely packed in an upright ring-shaped cylinder made of carbon felt with an outer diameter of 60mm x an inner diameter of 55mm x a height of 60mm (Fig. 1), put it into a self-propagating high-temperature synthesis furnace, and fill it with 3-15 MPa high-pressure nitrogen (purity 99.99%) after vacuuming, and the synthesis atmosphere is high-pres...

Embodiment 2

[0027] Adopt the same technique of embodiment 1, just replace blast furnace slag with dolomite powder instead, it and metal silicon powder, aluminum powder and 20% Sialon powder of the present invention synthesis make raw material, the component design of Ca-α-Sialon is in the whole Ca- Ca-α / β-Sialon can be synthesized by high-temperature self-propagating process due to changes in the α-Sialon phase region. Specifically, press M x Si 12-3x Al 3x o 2x N 16-2x Component design, any point in 0.4<x<1.4 can be selected. β-Sialon is designed according to the amount of silicon and aluminum. The rest of the conditions are the same as in Example 1, and the multi-phase (Ca, Mg)-α / β-Sialon powder is obtained.

Embodiment 3

[0029] Adopt the same technique of embodiment 1, just replace blast furnace slag with fly ash, limestone powder instead, it and metal silicon powder, aluminum powder and 20% Sialon powder synthesized by the present invention are made raw materials, the component design of Ca-α-Sialon Changing in the whole Ca-α-Sialon phase region, Ca-α / β-Sialon can be synthesized by high temperature self-propagating process. Specifically, press M x Si 12-3x Al 3x o 2x N 16-2x Component design, any point in 0.4<x<1.4 can be selected. β-Sialon is designed according to the composition of silicon, aluminum and fly ash. The rest of the conditions are the same as in Example 1, and a multi-phase Ca-α / β-Sialon powder is obtained.

[0030] SiO 2

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Abstract

The present invention is high-temperature self-spreading process of synthesizing alpha / beta-Sialon powder at low cost and belongs to the field of the superfine non-oxide powder preparation. Metallic silicon, metallic aluminum powder, slag or some natural mineral or their mixture and Sialon powder in certain proportion are mixed and nitrogen in 3-15 MPa is led in to prepare alpha-Sialon powder. The said process features no need of pressing block in advance, reaction completed in a vertical annular or disc container of carbon felt, the addition of Sialon additive as crystal seed and diluent, low cost, low impurity content in the reaction system and loose combustion product.

Description

technical field [0001] The invention relates to a low-cost method for synthesizing multiphase α / β-sialon powder. More precisely, it provides a method of synthesizing powder through high-temperature self-propagating process using slag or some natural minerals, metal silicon powder and metal aluminum powder as main raw materials. It belongs to the field of non-oxide superfine powder preparation. Background technique [0002] Sialon is a silicon nitride-based ceramic developed in the past 20 years. It has high temperature stability, high strength, wear resistance, corrosion resistance and thermal shock resistance. Compared with β-Sialon, α-Sialon has higher The hardness and wear resistance, strength and toughness are slightly lower than β-Sialon. Due to the different characteristics of α-Sialon and β-Sialon, when preparing materials, the phase composition can be adjusted by controlling the original composition to obtain the desired performance. Therefore, the multiphase α / β-S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/599C04B35/64
Inventor 江国键庄汉锐李文兰张宝林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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