Process for preparation of self-spread high-temperature synthesizing low cost ª‡-sialon powder

A self-propagating high-temperature, low-cost technology, applied in the field of high-temperature self-propagating process synthesis powder, low-cost synthesis of α-sialon powder, can solve the problem of high cost of silicon nitride and aluminum nitride, to slow down the reaction speed, The effect of reducing the impurity content of the system and reducing the production cost

Inactive Publication Date: 2008-06-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"A Method for Synthesizing Sialon Ceramic Powder at Low Cost" (Application No. 01126758.5) invented by Chen Weiwu and others from Shanghai Institute of Ceramics, Chinese Academy of Sciences, is in silicon powder, aluminum powder, silicon nitride or Sialon powder Add aluminum nitride powder and industrial waste, such as slag, slag, fly ash or clay that exists in large quantities in nature, and obtain low-cost single-phase α-Sialon powder by adopting a high-efficiency and energy-saving self-propagating high-temperature synthesis process, but silicon nitride and AlN cost higher

Method used

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  • Process for preparation of self-spread high-temperature synthesizing low cost ª‡-sialon powder
  • Process for preparation of self-spread high-temperature synthesizing low cost ª‡-sialon powder
  • Process for preparation of self-spread high-temperature synthesizing low cost ª‡-sialon powder

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Effect test

Embodiment 1

[0029] Taking blast furnace slag, metallic silicon powder, and aluminum powder from a certain iron and steel plant as raw materials, and 5% Sialon powder synthesized by the technology of the present invention, considering the chemical composition of slag (Table 1), the composition of α-Sialon is calculated by Ca 0.71 Mg 0.23 Si 9.18 Al 2.82 o 0.94 N 15.06 According to the design, the raw materials prepared according to this component are mixed in a nylon barrel with silicon nitride balls as the medium, and after 48 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 φ60mm×inner diameter of φ55mm×a height of φ60mm ( figure 2 As shown), put it into a self-propagating high-temperature synthesis furnace, and fill it with 15Mpa high-pressure nitrogen (purity 99.99%) after vacuuming. The synthesis atmosphere is high-pressure nitrogen, self-propagating combustion after ignition, and Sialon powd...

Embodiment 2

[0033] Adopt the same process of embodiment 1, just change to limestone powder (CaCO 3 >98wt%) instead of blast furnace slag, it is made raw material with metal silicon powder, aluminum powder and 15% Sialon powder synthesized by the present invention, and the composition of Ca-α-Sialon is Ca 0.8 Si 8.8 al 3.2 o 1.6 N 14.4 Design, synthesize Ca-α-Sialon by high-temperature self-propagating process, and the synthesized powder is determined as single-phase Ca-α-Sialon by XRD.

Embodiment 3

[0035] Adopt the same process of embodiment 1, just replace blast furnace slag with Bai Yunshi powder instead, it makes raw material with metal silicon powder, aluminum powder and 30% Sialon powder synthesized by the present invention, and the composition design of Ca-α-Sialon is in the whole Ca (Ca, Mg)-α-Sialon can be synthesized by high-temperature self-propagating process through the change in the -α-Sialon phase region. Specifically, press M x Si 12-3x al 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 (Ca, Mg)-α-Sialon powder is obtained.

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Abstract

The present invention is high-temperature self-spreading process of synthesizing alpha-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 α-Sialon powder. More precisely, it is a method of synthesizing powder through high-temperature self-propagating process with metallurgical slag or some natural minerals or their mixture, metal silicon powder and metal aluminum powder as the 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 two decades. It has high temperature stability, high strength, wear resistance, corrosion resistance and thermal shock resistance. Compared with β-Sialon, α-Sialon has higher Hardness and wear resistance, strength and toughness are slightly lower than β-Sialon, and due to the dissolution of metal elements, it also has electrical conductivity, and α-Sialon added with certain rare earth elements also has new optical properties. It has relatively high transparency and exhibits a ...

Claims

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Application Information

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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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