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Prepn process of transparent toughened magnesia alumina spinel ceramic

A technology of tough magnesium aluminum spinel and magnesium aluminum spinel, which is applied in the field of transparent ceramic preparation to achieve the effect of simple preparation process, tight combination and high toughness

Inactive Publication Date: 2007-06-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transmittance of the magnesium aluminum spinel transparent ceramics prepared by this method in the visible light band is only 40-60%, and the toughness of the ceramics is not involved.

Method used

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  • Prepn process of transparent toughened magnesia alumina spinel ceramic

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Effect test

Embodiment 1

[0033] The processing steps of the present embodiment are as follows:

[0034] (1) Powder preparation and granulation

[0035] Weigh 1000.00 grams of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 12H 2 O, analytical purity ≥99.99%) and 208.86 grams of magnesium sulfate (MgSO 4 ·7H 2 O, analytical purity ≥ 99.99%), put it into a wide-mouthed quartz cup, add deionized water (the addition of deionized water is not strictly required, and flood the MgSO 4 ·7H 2 O and NH 4 Al(SO 4 ) 2 12H 2 O can be), fully stirred until completely dissolved; put the quartz cup with the mixed solution into the muffle furnace for roasting, heat to 1100 °C at a heating rate of 10 °C / min, and roast at this temperature for 6 hours to complete the formation of spinels Then, it is cooled to room temperature with the furnace, sieved with a 250-mesh sieve after grinding, and the magnesium-aluminum spinel nano-powder of about 30nm is obtained;

[0036] The sieved magnesium aluminum spinel nanopowde...

Embodiment 2

[0044] The processing steps of the present embodiment are as follows:

[0045] (1) Powder preparation and granulation

[0046] Weigh 1000.00 grams of ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 12H 2 O, analytical purity ≥99.99%) and 181.01 grams of magnesium sulfate (MgSO 4 ·7H 2 O, analytical purity ≥ 99.99%), put it into a wide-mouthed quartz cup, add deionized water (the addition of deionized water is not strictly required, and flood the MgSO 4 ·7H 2 O and NH 4 Al(SO 4 ) 2 12H 2 O can be), fully stirred until completely dissolved; put the quartz cup with the mixed solution into the muffle furnace for roasting, heat to 1150 °C at a heating rate of 5 °C / min, and roast at this temperature for 4 hours to complete the formation of spinels Then, it is cooled to room temperature with the furnace, sieved with a 250-mesh sieve after grinding, and the magnesium-aluminum spinel nano-powder of about 30nm is obtained;

[0047] The sieved magnesium aluminum spinel nanopowder...

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Abstract

The transparent toughened magnesia alumina spinel ceramic is prepared with chemically pure MgSO4 and NH4Al(SO4)2 as material and through the following steps: 1. preparing nanometer magnesia alumina spinel powder through a molten salt roasting process, adding adhesive, ball milling for 24-48 hr, and pelletizing to form pellet of 40-100 microns size; 2. molding magnesia alumina spinel pellet and cold isostatic pressing to form dense biscuit; and 3. vacuum furnace sintering and hot isostatic pressing furnace sintering. The magnesia alumina spinel ceramic has the general expression of MgO .nAl2O3, where, n is 1.3-1.6; transmissibility in visible light band over 80 %; and fracture toughness of 2.7 MPa.m1 / 2 for n=1.3 and 3.2 MPa.m1 / 2 for n=1.5.

Description

technical field [0001] The invention belongs to the field of preparation of transparent ceramics, in particular to a method for toughening magnesium-aluminum spinel transparent ceramics. Background technique [0002] Magnesium-aluminum spinel transparent ceramic material is one of the three most promising transparent ceramic materials. Magnesium-aluminum spinel single crystal has isotropic optical properties, high hardness and strong corrosion resistance and radiation resistance, so that dense magnesium-aluminum spinel polycrystals not only have excellent optical properties (in the range of 0.2-5.5 microns The band can be transparent), and it has mechanical properties and large application size that cannot be compared with magnesium aluminum spinel single crystal and glass materials. Therefore, magnesium aluminum spinel transparent ceramics have high application value and have been used in military and Civilian fields, such as armored bulletp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443C04B35/622B28B3/00
Inventor 卢铁城黄存兵常相辉齐建起林理彬
Owner SICHUAN UNIV
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