Alumina ceramics composite containing novel four-component sintering adjuvant

A technology of alumina ceramics and sintering aids, applied in the field of alumina ceramics manufacturing, can solve the problems of lower sintering temperature, high temperature strength, decreased wear resistance, grain growth, etc., to achieve the purpose of inhibiting grain growth and good high temperature Mechanical, effects of improving high temperature strength and oxidation resistance

Inactive Publication Date: 2010-07-07
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, liquid phase sintering also has many disadvantages. First, the liquid phase remains in the grain boundary as a glass phase, which reduces the high-temperature strength and wear resistance, and cannot meet certain high-temperature applications; secondly, it is easy to cause grain Abnormal growth [Edited by Suz

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1: Take nano MgO: nano La 2 O 3 : Nano CaO: Nano SiO 2 Mass ratio=0.15:0.15:0.3:0.4 The mixture (10% of the total mass of the precursor powder) is mixed with 88wt% silicon carbide powder, 2wt% phenolic resin, and the same weight of water at room temperature to form a suspension, which is electrically stirred After stirring the suspension for 5 minutes, insert a 1000W high-power ultrasonic transducer into the suspension, stir it with an electric stirrer for 5 minutes, and insert a 1000W high-power ultrasonic transducer into the suspension. Start the ultrasonic generator and apply a pulsed ultrasonic field. After working for 20 minutes, the obtained suspension is filtered, dried, crushed, sieved, and then put into a mold for compression molding. After heat treatment to remove the binder, the green body is heated in a vacuum carbon tube furnace. The temperature is kept at 1350°C for 1 hour, and at 1380°C for 30 minutes, the temperature controller is turned off, and ...

Example Embodiment

[0019] Example 2: Take nano BeO: nano Ce 2 O 3 : Nano CaO: Nano SiO 2 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 electrically stirred After stirring the suspension for 5 minutes, insert a 1500W high-power ultrasonic transducer into the suspension, stir it with an electric stirrer for 5 minutes, and insert a 1500W high-power ultrasonic transducer into the suspension. Start the ultrasonic generator and apply a pulsed ultrasonic field. After working for 20 minutes, the obtained suspension is filtered, dried, crushed, sieved, and then put into a mold for compression molding. The green body is heat-treated to remove the binder, and the temperature is programmed in a vacuum carbon tube furnace. The temperature is kept at 1380°C for 1.5 hours, and at 1430°C for 20 minutes, the tem...

Example Embodiment

[0020] Example 3: Take nano BaO: nano Lu 2 O 3 : Nano CaO: Nano SiO 2 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 mixer After stirring for 5 minutes, insert a 2000W high-power ultrasonic transducer into the suspension, and insert a 2000W high-power ultrasonic transducer into the suspension after stirring for 5 minutes with an electric stirrer. Start the ultrasonic generator and apply a pulsed ultrasonic field. After working for 20 minutes, the obtained suspension is filtered, dried, crushed, sieved, and then put into a mold for compression molding. The green body is heat-treated to remove the binder, and the temperature is programmed in a vacuum carbon tube furnace. The temperature is kept at 1400°C for 1.5 hours, and at 1450°C for 20 minutes, the temperatur...

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Abstract

The invention discloses an alumina ceramics composite containing a novel four-component sintering adjuvant, which is characterized in that the four-component adjuvant is MO-CaO-SiO2-L2O3, wherein M is one of Mg, Ba and Be, and L is a rare earth element which is one of Ce, La and Lu. The alumina ceramics composite has the following components in percentage by weight: (1), 75%-90% of alumina powder; (2), 3%-6% of nano MO (M is one of Mg, Ba and Be); (3), 2%-6% of nano SiO2; (4), 2%-6% of nano CaO; and (5), 3%-7% of nano L2O3 (L is the rare earth element which is one of Ce, La and Lu). The particle size of the four-component sintering adjuvant is less than 300 nanometers, and the particle size of main alumina powder is at nanometer scale, namely 1-10 nanometers. By forming liquid phase and gradually forming spinel-like matter (the melting point thereof is more than 2100 DEG C) at later sintering stage to eliminate the liquid phase, sintering is promoted and simultaneously the growth of grain is inhibited, air hole elimination is promoted, density is improved and fine and even alumina ceramics grain and grain boundary air hole are formed, thereby ensuring the alumina ceramics material to have better high-temperature mechanical performance and wear resistance.

Description

technical field [0001] The invention relates to a method for producing alumina ceramics, in particular to an alumina ceramic composition containing a sintering aid. Background technique [0002] Alumina ceramics have many advantages such as stable chemical properties, high mechanical strength, high hardness, high temperature resistance, good wear resistance, high electrical insulation capacity, oxidation resistance, good mechanical properties, rich raw material reserves, and low prices. It is an application field High-performance multi-purpose engineering ceramics with the widest usage, the largest amount, and great application development potential, widely used in various fields such as mechanical chemistry, electronics, aviation, and national defense [E. Medvedovski, Wear-resistant engineering ceramics, Wear, 249, 2001, 821 -828; Boutin P., Arthroplastie Totale de Hance par Prosthes en Alumine Fritte, Rev. Chir. Orthop., 1972, 58: 229-246.], known as the "King of Ceramics"...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/63
Inventor 水淼任元龙宋岳王青春黄峰涛
Owner NINGBO UNIV
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