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Carborundum ceramics manufacturing method based on novel nanometer four-component sintering additives

A technology of silicon carbide ceramics and sintering aids, which is applied in the field of silicon carbide ceramics manufacturing, can solve the problems of increasing the diffusion coefficient of silicon carbide atoms, reducing the sintering temperature, complex and low efficiency, etc. grain growth and avoid the effect of ball milling process

Inactive Publication Date: 2010-06-30
NINGBO UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The currently used sintering aids are all based on the formation of a liquid phase between silicon carbide solid particles at a lower temperature, such as [Tan Shouhong; Liao Lulin's application number is 02111060.3 Chinese invention patent containing the carbonization of the reaction synthesis carbon boron aluminum compound phase Silicon ceramics and its liquid phase sintering method] to increase the diffusion coefficient of silicon carbide atoms and reduce the sintering temperature, which cannot avoid the problems of low high temperature strength of the fired body, abnormal grain growth and complex and inefficient precursor preparation process

Method used

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  • Carborundum ceramics manufacturing method based on novel nanometer four-component sintering additives
  • Carborundum ceramics manufacturing method based on novel nanometer four-component sintering additives
  • Carborundum ceramics manufacturing method based on novel nanometer four-component sintering additives

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Effect test

Embodiment 1

[0022] Embodiment 1: get nanometer MgO: nanometer La 2 o 3 : Nano Al 2 o 3 : Nano Y 2 o 3 Mass ratio=0.15:0.15:0.3:0.4 mixture (accounting for 10% of the total mass of the precursor powder) mixed with 88wt% silicon carbide powder, 2wt% phenolic resin, and the same weight of water at room temperature to form a suspension, after electric stirring After stirring for 5 minutes, a 1000W high-power ultrasonic transducer was inserted into the suspension, and the position of the ultrasonic probe was 3 cm below the liquid surface. Start the ultrasonic generator, a pulse period is 3 seconds, the working time is 2 seconds, the idle time is 1 second, and the working time is 20 minutes. The obtained suspension was filtered, dried at 80°C for 2 hours, crushed and sieved, put into a cylindrical mold and left to stand at 230Mpa for 5 minutes to obtain a green body. The green body was heat treated at 250°C for 20 minutes to remove the binder. Place the biscuit in a vacuum carbon tube fu...

Embodiment 2

[0023] Embodiment 2: get nanometer CaO: nanometer Ce 2 o 3 : Nano Al 2 o 3 : Nano Y 2 o 3 Mass ratio=0.2:0.2:0.4:0.2 The mixture (accounting for 5% of the total mass of the precursor powder) is mixed with 90wt% silicon carbide powder, 5wt% phenolic resin, and the same weight of water at room temperature to form a suspension, which is stirred electrically After stirring for 5 minutes, a 1500W high-power ultrasonic transducer was inserted into the suspension, and the position of the ultrasonic probe was 3 cm below the liquid surface. Start the ultrasonic generator, a pulse period is 5 seconds, the working time is 2 seconds, the idle time is 3 seconds, and the working time is 20 minutes. The obtained suspension was filtered, dried at 80°C for 2 hours, crushed and sieved, put into a cylindrical mold and left to stand at 250Mpa for 5 minutes to obtain a green body. The green body was heat treated at 250°C for 20 minutes to remove the binder. Place the biscuit in a vacuum car...

Embodiment 3

[0024] Embodiment 3: get nanometer BaO: nanometer Lu 2 o 3 : Nano Al 2 o 3 : Nano Y 2 o 3 Mass ratio=0.3:0.3:0.2:0.2 The mixture (accounting for 15% of the total mass of the precursor powder) is mixed with 83wt% silicon carbide powder, 2wt% PVA, and the same weight of water at room temperature to form a suspension, which is passed through an electric stirrer After stirring for 5 minutes, a 2000W high-power ultrasonic transducer was inserted into the suspension, and the position of the ultrasonic probe was 3 cm below the liquid surface. Start the ultrasonic generator, a pulse period is 5 seconds, the working time is 2 seconds, the idle time is 3 seconds, and the working time is 20 minutes. The obtained suspension was filtered, dried at 80°C for 2 hours, crushed and sieved, put into a cylindrical mold and left to stand at 250Mpa for 5 minutes to obtain a green body. The green body was heat treated at 250°C for 20 minutes to remove the binder. Place the biscuit in a vacuum...

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Abstract

A carborundum ceramics preparing method with novel nanometer four-component oxide sintering additives is characterized in that in the adopted four-component oxide sintering additives, two are Al203 and Y 203 and the other two are nanometer MO (M is one of Mg, Ba, Be and Ca) and L203 (L is a rare-earth element and is one of La, Ce and Lu). Each substance accounts for 0.1 to 0.7 of the whole sintering additives in percentage by weight. The particle size of the four-component novel sintering additives is less than 300 nanometers and the particle size of the main component carborundum is micron. The main raw material of 75-90wt% of carborundum powder with micron particle size, 5-20 wt% novel nanometer four-component sintering additives and 1-5wt% binding agent is fabricated into carborundum ceramics sintering body after the work procedures of high power ultrasonic mixing, drying, molding, high temperature sintering and the like. The method can overcome the contradiction between the low sintering temperature and the dissatisfactory high temperature mechanical property for the liquid phase sintering carborundum ceramics, thus is particularly applicable to the high strength continuous use in ultra high temperature harsh environment.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing silicon carbide ceramics based on a novel nanometer four-component sintering aid. Background technique [0002] Silicon carbide ceramic materials have excellent characteristics such as high temperature strength, high temperature oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness, thermal shock resistance and chemical corrosion resistance. Automobiles, mechanical chemicals, environmental protection, space technology, information electronics, energy and other fields have increasingly wide applications, and have become an irreplaceable structural ceramic with excellent performance in many industrial fields. [0003] The dynamic seal in mechanical equipment is carried out through the rotation and sliding of two sealing end materials. As the sealing end material, it is required to have high...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 水淼任元龙宋岳王青春黄锋涛
Owner NINGBO UNIV
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