A kind of preparation method of flaky y2sio5

A flaky, 3.6H2O technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of harsh reaction conditions, complicated preparation process, long reaction cycle, etc., and achieve easy shape and size , Simple operation, enhanced fluidity effect

Active Publication Date: 2018-06-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their unique advantages, but there are also disadvantages, such as complex preparation process, long reaction cycle, harsh reaction conditions, etc.

Method used

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  • A kind of preparation method of flaky y2sio5
  • A kind of preparation method of flaky y2sio5

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a flake Y 2 SiO 5 The preparation method comprises the following steps:

[0029] (1) Weigh analytically pure Y(NO) 3 ·6H 2 O in a beaker, in a fume hood as Y(NO) 3 ·6H 2 O: TEOS = 2: 1 molar ratio Take a certain amount of TEOS, stir for 20 minutes to get a mixture of the two, then add a certain amount of absolute ethanol to prepare a solution with a concentration of 1mol / L, heat and stir evenly to obtain a transparent yttrium silicate precursor mixture.

[0030] (2) Place the obtained yttrium silicate precursor mixture in a polytetrafluoroethylene-lined hydrothermal kettle, control the filling ratio to 40%, then put the reaction kettle into an oven, control the temperature at 100°C, and react for 24 hours . A wet gel of yttrium silicate was obtained.

[0031] (3) The obtained yttrium silicate wet gel was dried at 80°C, and then heat-treated in a muffle furnace at 400°C for 60 minutes to obtain yttrium silicate dry gel powder.

[0032] (4) Mix the obtained yttri...

Embodiment 2

[0035] a flake Y 2 SiO 5 The preparation method comprises the following steps:

[0036] (1) Weigh analytically pure Y(NO) 3 ·6H 2 O in a beaker, in a fume hood as Y(NO) 3 ·6H 2 The molar ratio of O:TEOS=2:1 measures certain TEOS, stirs 40min to obtain the mixed solution of the two, then adds a certain amount of dehydrated alcohol, is mixed with the solution that concentration is 0.75mol / L, heats and stirs evenly, obtains Transparent yttrium silicate precursor mixture.

[0037] (2) Place the obtained yttrium silicate precursor mixture in a polytetrafluoroethylene-lined hydrothermal kettle, control the filling ratio to 50%, then put the reaction kettle into an oven, control the temperature at 120°C, and react for 12h . A wet gel of yttrium silicate was obtained.

[0038] (3) The obtained yttrium silicate wet gel was dried at 100°C, and then heat-treated in a muffle furnace at 450°C for 30 minutes to obtain yttrium silicate dry gel powder.

[0039] (4) Mix the obtained ytt...

Embodiment 3

[0044] a flake Y 2 SiO 5 The preparation method comprises the following steps:

[0045] (1) Weigh analytically pure Y(NO) 3 ·6H 2 O in a beaker, in a fume hood as Y(NO) 3 ·6H 2 The molar ratio of O:TEOS=2:1 measures certain TEOS, stirs 60min to obtain the mixed solution of the two, then adds a certain amount of dehydrated alcohol, is mixed with the solution that concentration is 0.5mol / L, heats and stirs evenly, obtains Transparent yttrium silicate precursor mixture.

[0046] (2) Place the obtained yttrium silicate precursor mixture in a polytetrafluoroethylene-lined hydrothermal kettle, control the filling ratio to 60%, then put the reaction kettle into an oven, control the temperature at 110°C, and react for 18h . A wet gel of yttrium silicate was obtained.

[0047] (3) The obtained yttrium silicate wet gel was dried at 60° C., and then heat-treated in a muffle furnace at 300° C. for 60 minutes to obtain yttrium silicate dry gel powder.

[0048] (4) Mix the obtained...

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Abstract

The invention discloses a flaky Y2SiO5 preparation method and belongs to the technical field of ceramic material preparation.The flaky Y2SiO5 preparation method includes the following steps that 1, Y(NO)3 6 H2O and TEOS are taken and are stirred evenly, anhydrous ethanol is add to prepare a solution with the concentration of 0.5-1 mol / L, and even stirring is performed under the heating condition to prepare a transparent mixed yttrium silicate precursor solution; 2, the transparent mixed yttrium silicate precursor solution reacts at the temperature of 80-120 DEG C for 12-24 hours to prepare yttrium silicate wet gel; 3, after the yttrium silicate wet gel is dried, heat treatment is performed to prepare dried yttrium silicate gel powder; 4, the dried yttrium silicate gel powder and mixed double salt are evenly mixed according to the mass ratio of 1 to 1-3, and then heat treatment is performed; 5, the treated product in the step 4 is sequentially subjected to washing and acid pickling, and then drying is performed to obtain the flaky Y2SiO5.Compared with a traditional sol-gel method and a solid-phase reaction method, the flaky Y2SiO5 preparation method can prepare the flaky Y2SiO5 at a lower temperature, is simple in process and good in repeatability and can prepare the flaky Y2SiO5 controllable in morphology and uniform in size.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic materials, in particular to a flake Y 2 SiO 5 method of preparation. Background technique [0002] Y 2 SiO 5 Also known as yttrium orthosilicate, it belongs to monoclinic biaxial crystal system and belongs to C 6 2h space group, whose (C 2 / c) The lattice constants are a=1.250nm, b=0.972nm, c=1.042nm, and the angle between crystal planes is β=102.68°, with X 1 -Y 2 SiO 5 (low temperature phase) and X 2 -Y 2 SiO 5 (High temperature phase) Two different monoclinic structures. [Deng Fei, Huang Jianfeng, Cao Liyun, et al. Research progress of yttrium silicate materials [J]. Aerospace Materials Technology, 2006,4(6): 1-4.]. [0003] Yttrium orthosilicate (Y 2 SiO 5 ) The material has a series of structural characteristics and a series of excellent physical and chemical properties, which make it have a wide range of application prospects in the high temperature field and th...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B33/20
CPCC01B33/20C01P2002/72C01P2004/03
Inventor黄剑锋周磊雍翔曹丽云欧阳海波陈意声李翠艳李春光
OwnerSHAANXI UNIV OF SCI & TECH