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Method for preparing MgO-Y2O3 nanoceramics by two-step microwave sintering

A nano-ceramic, mgo-y2o3 technology is applied in the field of microwave two-step sintering to prepare MgO-Y2O3 nano-ceramic, which can solve the problems of high cost and carbon pollution of nano-ceramic, and achieve short firing cycle, uniform size and fine grain size. Effect

Inactive Publication Date: 2014-07-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies of the prior art, in order to solve the prior art preparation of MgO-Y 2 o 3 Nano-ceramic carbon pollution, high cost and other problems, the present invention provides a microwave two-step sintering preparation of MgO-Y 2 o 3 nanoceramic approach

Method used

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  • Method for preparing MgO-Y2O3 nanoceramics by two-step microwave sintering
  • Method for preparing MgO-Y2O3 nanoceramics by two-step microwave sintering

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation of MgO-Y by a microwave two-step sintering 2 o 3 The method of nano ceramics, the steps are as follows:

[0028] (1) Weigh 42 parts by weight of MgO powder, 58 parts by weight of Y 2 o 3 powder mix;

[0029] (2) Put the powder prepared in step (1) into a polyurethane ball mill tank, then add 700 parts by weight of deionized water and 600 parts by weight of zirconia balls, and mill on a planetary ball mill for 6 hours to obtain MgO-Y 2 o 3 Slurry: Gained slurry is dried, and the PVA solution that accounts for 1wt% of dried slurry, concentration is 5wt% is added, granulated, and granulate passes 60 mesh sieves;

[0030] (3) Press the compact under 30MPa, and then isostatically press under 200MPa;

[0031] (4) Put the compact into an alumina sagger, coat the outer surface of the sagger with a layer of graphite paint, and then place the alumina sagger in a microwave oven;

[0032] (5) Adjust and control the output power of the microwave oven, raise the te...

Embodiment 2

[0034] Preparation of MgO-Y by a microwave two-step sintering 2 o 3 The method of nano ceramics, the steps are as follows:

[0035] (1) Weigh 43 parts by weight of MgO powder, 57 parts by weight of Y 2 o 3 powder mix;

[0036] (2) Put the powder prepared in step (1) into a polyurethane ball mill tank, then add 700 parts by weight of deionized water and 600 parts by weight of zirconia balls, and mill on a planetary ball mill for 4 hours to obtain MgO-Y 2 o 3 Slurry: Gained slurry is dried, and adding 1wt% concentration is the PVA solution of 5wt%, granulates, and granulate crosses 40 mesh sieves;

[0037] (3) Press the compact at 20MPa, and then isostatically press at 220MPa;

[0038] (4) Put the compact into an alumina sagger, coat a layer of carbon black paint on the outer surface of the sagger, and then place the alumina sagger in a microwave oven;

[0039] (5) Adjust and control the output power of the microwave oven, raise the temperature to 1340°C at a heating rate...

Embodiment 3

[0041] Preparation of MgO-Y by a microwave two-step sintering 2 o 3The method of nano ceramics, the steps are as follows:

[0042] (1) Weigh 40 parts by weight of MgO powder, 60 parts by weight of Y 2 o 3 powder mix;

[0043] (2) Put the powder prepared in step (1) into a polyurethane ball mill tank, then add 700 parts by weight of deionized water and 600 parts by weight of zirconia balls, and mill on a planetary ball mill for 3 hours to obtain MgO-Y 2 o 3 Slurry: Gained slurry is dried, and adding 1wt% concentration is the PVA solution of 5wt%, granulates, and granule crosses 100 mesh sieves;

[0044] (3) The green compact was pressed under 40MPa, and then isostatically pressed under 180MPa;

[0045] (4) Put the compact into an alumina sagger, coat a layer of green silicon carbide coating on the outer surface of the sagger, and then place the alumina sagger in a microwave oven;

[0046] (5) Adjust and control the output power of the microwave oven, raise the temperatur...

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Abstract

The invention relates to a method for preparing MgO-Y2O3 nanoceramics by two-step microwave sintering. The method comprises the steps of proportioning, ball-milling and granulating, pressing a green piece, placing the green piece in an aluminum-oxide-made sagger of which the outer surface is coated with a heating-assistant material, then placing into a microwave sintering furnace, carrying out microwave sintering in two steps, and cooling to obtain MgO-Y2O3 nanoceramics, wherein in the first sintering step, the first-step sintering temperature T1 is 1320-1400 DEGC and the heat preservation time is 1-10 minutes, and in the second sintering step, the second-step sintering temperature T2 is 1250-1300 DEGC and the heat preservation time is 10-90 minutes. The method disclosed by the invention has the advantages of simple preparation process, short firing cycle and low energy consumption and can be used for preparing samples with larger size and complex shapes and is suitable for industrial production.

Description

technical field [0001] The invention relates to a microwave two-step sintering preparation of MgO-Y 2 o 3 The method for nano ceramics belongs to the field of inorganic non-metallic materials. Background technique [0002] MgO-Y 2 o 3 Nano-ceramic has excellent mid-wave infrared transmittance, high mechanical properties, good impact resistance and erosion resistance, and is a new type of infrared window material. Currently, MgO-Y 2 o 3 The preparation methods of nano-ceramics mainly include spark plasma sintering (SPS) and hot isostatic pressing (HIP). However, both processes have their own problems. SPS is limited by equipment, it is difficult to prepare samples of large size and complex shape, and it is easy to cause carbon pollution to samples; HIP preparation process is complicated, production efficiency is low, and production cost is high. [0003] Compared with the traditional sintering process, microwave sintering for ceramic preparation has the advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B35/622
Inventor 张玉军孙海滨李腾谭砂砾龚红宇
Owner SHANDONG UNIV
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