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A dense silicon nitride ceramic liquid riser and its preparation method and application

A silicon nitride ceramic and liquid riser technology is applied in the field of dense silicon nitride ceramic liquid riser and its preparation and application, which can solve the problems of short service life, poor lethality, low strength, etc. The effect of high bending strength and high density

Active Publication Date: 2019-03-15
BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to poor lethality and low strength, the service life is short, an average of 2 months

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a silicon nitride ceramic liquid riser, which is made of the following raw materials: 85 kg of silicon nitride powder, 5 kg of yttrium oxide, 7 kg of aluminum oxide, and 3 kg of cerium oxide.

[0043] This embodiment also provides the preparation method of the silicon nitride ceramic liquid riser, the specific steps are:

[0044] (1) Get each raw material, add deionized water, the ratio of the total weight of the raw material to the weight of deionized water is 1:1, and grind for 10h in a vertical circulating stirring mill to obtain a slurry;

[0045] (2) Spray-dry the slurry while stirring to obtain a particle size D 50 50μm granulation raw material powder;

[0046] (3) filling the granulation raw material powder into a mould, placing it in a cold isostatic press, and performing a cold isostatic pressing process at 120MPa, with a holding time of 20s, to make a green body;

[0047](4) The green body obtained in step (3) was sintered in a press...

Embodiment 2

[0050] This embodiment provides a silicon nitride ceramic liquid riser similar to Embodiment 1, the difference is that the formula for preparing the silicon nitride ceramic liquid riser is different, specifically: silicon nitride powder 88kg, yttrium oxide 4kg, aluminum oxide 4kg, cerium oxide 4kg, preparation method is completely with embodiment 1.

[0051] The relative performance was tested under the same conditions, and there was no significant difference between the specific product indicators of this comparative example and that of Example 1.

Embodiment 3

[0053] This embodiment provides a silicon nitride ceramic liquid riser similar to that of Embodiment 1. The difference is that the formula for preparing the silicon nitride ceramic liquid riser is different, specifically: silicon nitride powder 86kg, yttrium oxide 5kg, aluminum oxide 6kg, cerium oxide 3kg, preparation method is completely with embodiment 1.

[0054] The relative performance was tested under the same conditions, and there was no significant difference between the specific product indicators of this comparative example and that of Example 1.

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Abstract

The invention relates to a compact silicon nitride ceramic lift pipe and a preparation method thereof. The silicon nitride ceramic lift pipe is prepared from 85-95 parts of silicon nitride and 5-15 parts of a sintering aid. The sintering aid is selected from one or more of aluminum oxide, magnesium oxide, yttrium oxide, cerium oxide and titanium carbide. The silicon nitride ceramic lift pipe provided by the invention has the characteristics of high density, high hardness, high bending strength, and strong fracture toughness, etc., and has long service life, can be used continuously for more than one year on a conventional low pressure aluminum casting machine. Through comprehensive optimization of the raw material composition and the preparation method, the production problem of silicon nitride lift pipes in the aluminum casting industry is solved, the quality of key parts in the domestic aluminum casting industry is enhanced, the aluminum casting production efficiency is greatly improved, the production cost is reduced, the production efficiency is significantly improved, the production cost is reduced, thus being conducive to breaking through the monopoly position of foreign silicon nitride enterprises in the industry, and improving the global awareness of China's silicon nitride ceramic level.

Description

technical field [0001] The invention relates to the technical field of special large-scale silicon nitride ceramics, in particular to a dense silicon nitride ceramic liquid riser and a preparation method and application thereof. Background technique [0002] Silicon nitride ceramics is a special ceramic material with the best comprehensive performance. Silicon nitride has high strength, high hardness, high fracture toughness, thermal shock resistance, and low friction coefficient. It has been widely used in photovoltaics, automobiles, metallurgy, chemicals, energy, and environmental protection. , aerospace and other fields. [0003] The riser tube is one of the key components on the low-pressure aluminum casting machine. Its performance directly affects the quality and production efficiency of cast aluminum products. The use environment of the riser tube has high requirements on the performance of the material, and its material requires excellent high temperature performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/626C04B35/64B22D18/04
CPCB22D18/04C04B35/584C04B35/622C04B35/62605C04B35/6261C04B35/62655C04B35/62695C04B35/64C04B2235/3206C04B2235/3217C04B2235/3225C04B2235/3229C04B2235/3843C04B2235/602C04B2235/6586C04B2235/77C04B2235/96C04B2235/9607C04B2235/9669
Inventor 庄新江张伟儒徐鹏王腾飞韦中华邹景良张哲孙峰
Owner BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD
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