Method for preparing bulk ceramic material from iron-silicon nitride powder

A technology of ferrosilicon nitride and ceramic materials, which is applied in the field of refractory materials to achieve the effects of uniform density, high density and improved mechanical properties

Active Publication Date: 2015-05-13
XIAN AOQIN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with silicon nitride ceramic powder, the price of ferrosilicon nitride powder is low, only about 1% of silicon nitride ceramic powder, and there are few reports about using silicon nitride powder to prepare bulk ceramic materials at present. There is an urgent need for a method of using low-cost raw material ferrosilicon nitride powder to prepare bulk ceramic materials with good high temperature resistance and mechanical properties, so as to provide raw materials for further preparation of low-cost structural ceramics

Method used

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  • Method for preparing bulk ceramic material from iron-silicon nitride powder
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  • Method for preparing bulk ceramic material from iron-silicon nitride powder

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Experimental program
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Embodiment 1

[0023] This embodiment includes the following steps:

[0024] Step 1. Adopt wet ball milling method to place the following raw materials by mass percentage in a ball mill and mix them uniformly: 90% of ferrosilicon nitride powder, 3.5% of lanthanum oxide powder, 3% of yttrium oxide powder, and 3.5% of aluminum oxide powder After ball milling, the uniformly mixed material is dried to obtain mixed powder; the ball milling medium of the wet ball mill is absolute ethanol, the ball-to-material ratio of the wet ball mill is 2.5:1, and the rotating speed of the ball mill is 125r / min, The quality of the absolute ethanol is 3 times of the sum of the mass of ferrosilicon nitride powder, lanthanum oxide powder, yttrium oxide powder and aluminum oxide powder; the average particle size of the ferrosilicon nitride powder is 0.5 μm, and the average The particle size is 2 μm, the average particle size of yttrium oxide powder is 3 μm, and the average particle size of alumina powder is 0.6 μm; ...

Embodiment 2

[0031] This embodiment includes the following steps:

[0032] Step 1. Using wet ball milling method, put the following raw materials by mass percentage in a ball mill and mix them uniformly: 95% of ferrosilicon nitride powder, 2% of lanthanum oxide powder, 1% of yttrium oxide powder, and 2% of aluminum oxide powder After ball milling, the uniformly mixed material is dried to obtain mixed powder; the ball milling medium of the wet ball mill is absolute ethanol, the ball-to-material ratio of the wet ball mill is 2:1, and the rotating speed of the ball mill is 150r / min, The quality of the absolute ethanol is 2 times of the sum of the mass of ferrosilicon nitride powder, lanthanum oxide powder, yttrium oxide powder and alumina powder; the average particle size of the ferrosilicon nitride powder is 0.4 μm, and the average The particle size is 3 μm, the average particle size of yttrium oxide powder is 2 μm, and the average particle size of alumina powder is 0.7 μm;

[0033] Step 2,...

Embodiment 3

[0037] This embodiment includes the following steps:

[0038] Step 1. Adopt wet ball milling method to place the following raw materials by mass percentage in a ball mill and mix them uniformly: 85% of ferrosilicon nitride powder, 5% of lanthanum oxide powder, 5% of yttrium oxide powder, and 5% of aluminum oxide powder After ball milling, the uniformly mixed material is dried to obtain a mixed powder; the ball milling medium of the wet ball mill is absolute ethanol, the ball-to-material ratio of the wet ball mill is 3:1, and the rotating speed of the ball mill is 100r / min, The quality of the absolute ethanol is the sum of the mass of ferrosilicon nitride powder, lanthanum oxide powder, yttrium oxide powder and alumina powder; the average particle size of the ferrosilicon nitride powder is 0.7 μm, and the average particle size of the lanthanum oxide powder is 1 μm , the average particle size of yttrium oxide powder is 2 μm, and the average particle size of alumina powder is 0.4...

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Abstract

The invention discloses a method for preparing a bulk ceramic material from iron-silicon nitride powder. The method comprises the following steps: firstly, placing a raw material in a ball mill and carrying out ball milling by virtue of a wet balling method, uniformly mixing and drying the ball-milled and uniformly mixed material to obtain mixed power; secondly, placing the mixed power in a hydraulic press and carrying out pre-press molding and placing the mixed power in a cold isostatic press for carrying out cold isostatic pressing to obtain a green body; and thirdly, placing the green body in a gas pressure sintering furnace for carrying out gas pressure sintering and cooling in the furnace to obtain the bulk ceramic material. According to the method, by virtue of the technological processes of uniformly mixing the raw material by virtue of the wet balling method to obtain the mixed powder and carrying out pre-press molding and cold isostatic pressing on the mixed powder to obtain the green body in combination with the gas pressure sintering, the bulk ceramic material with low porosity and large bulk density is prepared and the bulk ceramic material has the advantages of excellent high-temperature resistance and mechanical properties and can be used as a structural part ceramic to prepare kiln furniture or other refractory materials for high-temperature kilns.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a method for preparing bulk ceramic materials by using ferrosilicon nitride powder. Background technique [0002] Silicon nitride ceramics have been widely used in various structural components due to their excellent mechanical properties, such as engine and turbine components, heat exchangers, pump sealing materials, rolling element bearings, knives, corrosion-resistant thermocouple protection tubes, High temperature filters for corrosive liquids, etc. However, because the manufacturing cost of high-performance silicon nitride ceramic materials is relatively expensive, it cannot be used on a large scale in the industrial field. The raw material for manufacturing silicon nitride ceramics is silicon nitride ceramic powder, which is expensive, resulting in a relatively high cost of silicon nitride ceramics. High, limiting the application of silicon nitride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622
Inventor 管甲锁
Owner XIAN AOQIN NEW MATERIAL CO LTD
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