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A method for preparing YAG transparent ceramics by adopting core-shell structure powder

A core-shell structure and transparent ceramic technology is applied in the field of preparing YAG transparent ceramics by using core-shell structure powder, which can solve the problems of insufficiently satisfying industrial production needs, low yield of YAG raw material powder, and large precursor particle size. Achieve the effect of realizing technology promotion and commercial promotion, short preparation cycle, simple and easy operation of preparation process

Active Publication Date: 2021-12-24
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of preparing high-activity YAG raw material powder by co-precipitation method, the precursor gel needs to be washed repeatedly to remove redundant waste ions, impurities and other by-products, resulting in larger particle size and lower activity of the precursor; High-temperature calcination treatment above 1000°C is required to obtain high-purity YAG raw material powder
In addition, the yield of YAG raw material powder prepared by this method is low, the process is complicated, and the cost is high, which is not enough to meet the needs of industrial production

Method used

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  • A method for preparing YAG transparent ceramics by adopting core-shell structure powder
  • A method for preparing YAG transparent ceramics by adopting core-shell structure powder
  • A method for preparing YAG transparent ceramics by adopting core-shell structure powder

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Add 0.5mol / L of Y(NO 3 ) 3 The solution was added to the Al at a rate of 0.5ml / min 2 o 3 In the suspension, the precipitating agent is urea, the amount of ions added satisfies the stoichiometric ratio of Y:Al=3:5, and the reaction temperature is 50°C;

[0037] (2) the urea used in step (1) is added to Al as a pH regulator 2 o 3 In the slurry, keep the slurry pH=8.8, and the solid content is 35vol.%.

[0038] (3) directly filtering the slurry obtained in step (2), without washing, the core-shell structure powder can be obtained;

[0039] (4) Dry the powder obtained in step (3) in a constant temperature oven at 100°C for 24 hours, and calcinate the obtained powder at a low temperature of 300°C for 1 hour;

[0040] (5) Add sintering aid silicon dioxide and ammonium bicarbonate solution with pH=9 to the calcined powder, mix by ball milling for 10 hours, the rotating speed of ball milling is 165r / min; Dry in an oven for 12 hours, and pass the resulting powder thro...

Embodiment 2

[0045] (1) Add 0.8mol / L of Y(NO 3 ) 3 The solution was added to the Al at a rate of 3ml / min 2 o 3 In the suspension, the precipitant is urea, the amount of ions added satisfies the stoichiometric ratio of Y:Al=3:5, and the reaction temperature is 80°C;

[0046] (2) the urea used in step (1) is added to Al as a pH regulator 2 o 3 In the slurry, keep the slurry pH=9.1, and the solid content is 60vol.%.

[0047] (3) directly filtering the slurry obtained in step (2), without washing, the core-shell structure powder can be obtained;

[0048] (4) drying the powder obtained in step (3) in a constant temperature oven at 120°C for 24 hours, and calcining the obtained powder at a low temperature of 500°C for 2 hours;

[0049] (5) Add sintering aid magnesia and ammonium carbonate solution with pH=8 to the calcined powder, mix by ball milling for 16 hours, the rotating speed of ball milling is 155r / min; put the obtained slurry in a constant temperature oven at 75°C After drying fo...

Embodiment 3

[0054] (1) Add 0.6mol / L of Y(NO 3 ) 3 The solution was added to the Al at a rate of 2ml / min 2 o 3 In the suspension, the precipitating agent is urea, the amount of ions added satisfies the stoichiometric ratio of Y:Al=3:5, and the reaction temperature is 65°C;

[0055] (2) the urea used in step (1) is added to Al as a pH regulator 2 o 3 In the slurry, keep the slurry pH=9, and the solid content is 50vol.%;

[0056] (3) directly filtering the slurry obtained in step (2), without washing, the core-shell structure powder can be obtained;

[0057] (4) Dry the powder obtained in step (3) in a constant temperature oven at 110°C for 18 hours, and calcinate the obtained powder at a low temperature of 400°C for 1.5 hours;

[0058] (5) Add sintering aid calcium oxide and urea solution with pH = 7.2 to the calcined powder, mix by ball milling for 16 hours, the speed of ball milling is 155r / min; dry the obtained slurry in a constant temperature oven at 65°C 18h, the gained powder i...

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Abstract

The invention discloses a method for preparing YAG transparent ceramics by adopting a core-shell structure powder. The specific steps are: Y(NO 3 ) 3 solution added to Al 2 O 3 In the suspension, the precipitating agent is urea, the amount of ions added meets the stoichiometric ratio of Y:Al=3:5, the reaction temperature is 50-80°C; the pH of the slurry is adjusted by urea to 8.8-9.1, and the solid content is 35-60vol. %; the slurry is directly filtered without washing to obtain a core-shell structure powder; the powder is dried at a constant temperature, and the dried powder is calcined; the calcined powder is ball-milled, dried, and sieved; first dry pressed and then cooled Isostatic pressing, then calcining the green body in a muffle furnace; vacuum sintering the ceramic green body; annealing, grinding and polishing, to obtain YAG transparent ceramics. The present invention adopts precipitation method + non-washing method to prepare core-shell structure precursor powder, no waste ions in the product, high powder yield, high purity, and small particle size; the preparation process is simple and easy to operate, the sintering temperature is low, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, and relates to the preparation of YAG transparent ceramics, in particular to a method for preparing YAG transparent ceramics by adopting a core-shell structure powder. Background technique [0002] Since the emergence of transparent ceramics in the 1960s, they have been widely used in important scientific and technological fields such as lasers, lighting, medical equipment, military and national defense due to their advantages such as high temperature resistance, corrosion resistance, and excellent mechanical and optical properties. At present, various transparent ceramic materials emerge in an endless stream, such as YAG, sesquioxide, spinel, fluoride and other systems, which have been initially applied in many important fields. Among all the existing transparent ceramic materials, YAG transparent ceramics have become a hot spot and focus in the field of transparent ceramic materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44C04B35/628C04B35/64
CPCC04B35/44C04B35/62815C04B35/64C04B2235/3225C04B2235/3418C04B2235/3206C04B2235/3208C04B2235/9653C04B2235/6581C04B2235/656C04B2235/6567C04B2235/662
Inventor 张乐邵岑魏帅王骋周天元陈浩
Owner XUZHOU NORMAL UNIVERSITY
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