Method for preparing MgAlON transparent ceramic in pressureless sintering way

A technology of transparent ceramics and absolute ethanol, which is applied in the field of preparation of MgAlON transparent ceramics, can solve the problems of limiting the shape and size of sintered products, having no optical properties of materials, and difficult control of components, so as to achieve lower sintering temperature, uniform particle size, The effect of rapid reaction process

Active Publication Date: 2010-09-01
WUHAN UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

In 2005, Zhang Houxing et al. ("Research on ultra-fast synthesis of MgAlON spinel by spark plasma sintering", Journal of Ceramics, 26(1), 2005, 13-16) also reported that under pressure sintering conditions at 1600 ° C for 5 min A single-phase dense MgAlON ceramic bulk can be obtained, but there are no reports on the optical properties of the prepared materials
The patent pointed out that the two-step method is easy to obtain a single phase, improves the density of ceramics, and overcomes the disadvantages of simultaneous densification of the reaction, compl

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  • Method for preparing MgAlON transparent ceramic in pressureless sintering way
  • Method for preparing MgAlON transparent ceramic in pressureless sintering way
  • Method for preparing MgAlON transparent ceramic in pressureless sintering way

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Example Embodiment

[0044] Example 1:

[0045] The pressureless sintering preparation method of MgAlON transparent ceramics includes the following steps:

[0046] 1) Preparation of MgAlON transparent ceramic powder:

[0047] ① Weigh 88.21g of α-alumina powder, 3.79g of aluminum nitride powder and 8g of magnesium oxide powder, put them in a mixing bottle and mix to obtain mixed powder A; according to the ratio of the ball material (the material is mixed powder A) to 4: 1 Add alumina ball, add 200mL absolute ethanol, roller ball mill for 24 hours, get slurry A;

[0048] ② Dry slurry A (dry at 50°C in vacuum) to obtain mixture A;

[0049] ③ Pass the dried mixture A through a 100-mesh sieve, take 3 g and put it into a graphite crucible coated with boron nitride on the inner wall. The crucible is placed in a graphite reactor, and the graphite reactor is placed in a high current reaction synthesis device. The synthesis device is fed with 0.05Mpa nitrogen as a protective gas; a large current is directly applied...

Example Embodiment

[0062] Example 2:

[0063] The pressureless sintering preparation method of MgAlON transparent ceramics includes the following steps:

[0064] 1) Preparation of MgAlON transparent ceramic powder:

[0065] ① Weigh 88.77g of α-alumina powder, 7.23g of aluminum nitride powder and 4g of magnesium oxide powder, put them in a mixing bottle and mix to obtain mixed powder A; according to the ratio of the ball material (the material is mixed powder A) to 4: 1 Add alumina ball, add 200mL absolute ethanol, roller ball mill for 24 hours, get slurry A;

[0066] ② Dry slurry A (dry at 50°C in vacuum) to obtain mixture A;

[0067] ③ Pass the dried mixture A through a 100-mesh sieve, take 3 g and put it into a graphite crucible coated with boron nitride on the inner wall. The crucible is placed in a graphite reactor, and the graphite reactor is placed in a high current reaction synthesis device. The synthesis device is filled with 0.03Mpa nitrogen gas as a protective gas; a large current is directly ...

Example Embodiment

[0080] Example 3:

[0081] The pressureless sintering preparation method of MgAlON transparent ceramics includes the following steps:

[0082] 1) Preparation of MgAlON transparent ceramic powder:

[0083] ①Measure 84.36g of α-alumina powder, 7.64g of aluminum nitride powder and 8g of magnesium oxide powder, put them in a mixing bottle and mix to obtain mixed powder A; according to the ratio of the ball material (the material is mixed powder A) to 4: 1 Add alumina balls, add 250 mL of absolute ethanol, and roller ball mill for 24 hours to obtain slurry A;

[0084] ② Dry the slurry A (vacuum dried at 50°C) to obtain the mixture A;

[0085] ③ Pass the dried mixture A through a 100-mesh sieve, take 3g and put it into a graphite crucible coated with boron nitride on the inner wall. The crucible is placed in a graphite reactor, and the graphite reactor is placed in a high-current reaction synthesis device. The synthesis device is fed with 0.05Mpa nitrogen as a protective gas; a large curren...

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Abstract

The invention relates to a method for preparing MgAlON transparent ceramic, in particular to a method for preparing MgAlON transparent ceramic in a pressureless sintering way. The method is characterized by comprising the following steps of: (1) preparing MgAlON transparent ceramic powder; (2) mixing 95 to 99 percent by weight of MgAlON transparent ceramic powder and 0.1 to 5 percent by weight of fluoride, dispersing in absolute ethanol, and ball-milling to obtain slurry B; (3) drying the slurry B to obtain a mixture B; (4) carrying out pressing molding on the mixture B under the normal temperature by adopting axial mould pressing and then carrying out cold isostatic pressing to obtain a ceramic bisque; and (5) sintering to obtain the MgAlON transparent ceramic. The MgAlON transparent ceramic can obtain high-density (more than 99.5 percent) and excellent optical property without the processes of hot isostatic sintering, and the like; the optimal linear transmissivity of a flat material with the thickness of 2 mm within the wavelength range of 0.25 to 6mu m is more than 70 percent; and the material can be widely applied to various windows, shades, transparent safeguards, lamp tubes, optical devices, and the like.

Description

technical field [0001] The invention relates to a preparation method of MgAlON transparent ceramics, belonging to the field of preparation of transparent ceramic materials. Background technique [0002] In 1976, Jack K.H. first reported the crystal phase diagram of MgAlON, and then Weiss S, Sun Weiying, Willems HX, and Granon A studied the synthesis and phase relationship of MgAlON ceramics. MgAlON and MgAl 2 o 4 It has the same crystal structure and similar lattice constant as AlON, and has more stable thermodynamic properties than AlON. Because of its excellent mechanical properties, dielectric properties, physical and chemical stability, it shows good application prospects in the fields of high-temperature structural ceramics and refractory materials. In addition, high-purity, high-density MgAlON ceramics have excellent isotropic optical transmission properties from ultraviolet to mid-infrared light waves, making them widely used in high-temperature windows, fairings, ...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 王皓商青琳王为民傅正义王玉成张清杰
Owner WUHAN UNIV OF TECH
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