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A kind of preparation method of yb2si2o7 powder

A powder, 3·5H2O technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of complex preparation process, harsh reaction conditions, long reaction cycle, etc., and achieve simple process and high temperature low cost effect

Active Publication Date: 2018-07-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods have their unique advantages, but most of the disadvantages lie in the complex preparation process, long reaction cycle, harsh reaction conditions, and the need for post-crystallization treatment, etc.

Method used

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  • A kind of preparation method of yb2si2o7 powder
  • A kind of preparation method of yb2si2o7 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a Yb 2 Si 2 o 7 The preparation method of powder comprises the following steps:

[0030] 1) Choose commercially available ytterbium nitrate pentahydrate (Yb(NO) 3 ·5H 2 O), purity ≥ 99.9%; commercially available ethyl orthosilicate (Si(OC 2 h 5 ) 4 ), purity ≥ 99.8%; commercially available sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O), purity ≥ 99.8%; commercially available dehydrated alcohol, purity ≥ 99.8%.

[0031] 2) Weigh Yb(NO) 3 ·5H 2 O, fully dissolved in absolute ethanol, prepared into a solution with a concentration of 0.1mol / L, and the obtained solution was designated as solution A.

[0032] 3) measure ethyl orthosilicate (Si(OC 2 h 5 ) 4 ), according to Yb(NO) 3 ·5H 2 The molar ratio of O: TEOS = 1: 1, the measured amount of tetraethyl orthosilicate was added to the solution A, put into the magnetic rotor and placed on the magnetic stirrer, and the solution B was obtained after stirring for 1 hour.

[0033] 4) Pour solution B into a hydrot...

Embodiment 2

[0038] a Yb 2 Si 2 o 7 The preparation method of powder comprises the following steps:

[0039] 1) Choose commercially available ytterbium nitrate pentahydrate (Yb(NO) 3 ·5H 2 O), purity ≥ 99.9%; commercially available ethyl orthosilicate (Si(OC 2 h 5 ) 4 ), purity ≥ 99.8%; commercially available sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O), purity ≥ 99.8%; commercially available dehydrated alcohol, purity ≥ 99.8%.

[0040] 2) Weigh Yb(NO) 3 ·5H 2 O, fully dissolved in absolute ethanol, prepared into a solution with a concentration of 0.15mol / L, and the obtained solution was designated as solution A.

[0041] 3) measure ethyl orthosilicate (Si(OC 2 h 5 ) 4 ), according to Yb(NO) 3 ·5H 2 The molar ratio of O:TEOS=1:1.5, add the measured tetraethyl orthosilicate into the solution A, put it into the magnetic rotor and place it on the magnetic stirrer, and get the solution B after stirring for 1.5h.

[0042] 4) Pour solution B into a hydrothermal kettle, tighte...

Embodiment 3

[0047] a Yb 2 Si 2 o 7 The preparation method of powder comprises the following steps:

[0048] 1) Choose commercially available ytterbium nitrate pentahydrate (Yb(NO) 3 ·5H 2 O), purity ≥ 99.9%; commercially available ethyl orthosilicate (Si(OC 2 h 5 ) 4 ), purity ≥ 99.8%; commercially available sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O), purity ≥ 99.8%; commercially available dehydrated alcohol, purity ≥ 99.8%.

[0049] 2) Weigh Yb(NO) 3 ·5H 2 O, fully dissolved in absolute ethanol, prepared into a solution with a concentration of 0.2mol / L, and the obtained solution was designated as solution A.

[0050] 3) measure ethyl orthosilicate (Si(OC 2 h 5 ) 4 ), according to Yb(NO) 3 ·5H 2 The molar ratio of O: TEOS = 1: 2. Add the measured tetraethyl orthosilicate to solution A, put it into a magnetic rotor and place it on a magnetic stirrer, and stir for 2 hours to obtain solution B.

[0051] 4) Pour solution B into a hydrothermal kettle, tighten the hydrothe...

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Abstract

The invention discloses a preparation method of Yb2Si2O7 powder, and belongs to the technical field of ceramic material preparation.The preparation method comprises the following steps that 1, Yb(NO)3.5H2O is taken to be dissolved in absolute ethyl alcohol to prepare a solution A with the concentration of 0.1-0.3 mol / L; 2, Si(OC2H5)4 is added into the solution A, and the materials are fully stirred to be uniform to prepare a solution B; 3, the solution B is subjected to a solvothermal reaction at the temperature of 80 DEG C-120 DEG C to prepare wet gel, and the wet gel is dried and then ground to prepare dry gel powder; 4, the dry gel powder is subjected to presintering treatment at the temperature of 200 DEG C-400 DEG C and then cooled to room temperature, and powder A is prepared; 5, the powder A and Na2MoO4.2H2O are fully mixed to be uniform, sintered at the temperature of 700 DEG C-900 DEG C and then cooled to the room temperature, and powder B is prepared; 6, the powder B is dissolved by adding water and then subjected to centrifugal separation, and precipitates are washed and dried to prepare the Yb2Si2O7 powder.The method is easy to operate, short in reaction period and mild in reaction condition; the Yb2Si2O7 powder prepared through the method is controllable in morphology, high in purity and uniform in particle size.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic materials, in particular to a Yb 2 Si 2 o 7 Powder preparation method. Background technique [0002] In recent years, some silicon-based non-oxide ceramics, such as SiC and Si 3 N 4 , and carbon fiber reinforced SiC (Cf / SiC) ceramic matrix composites, because of its low density, high strength, good high temperature stability and oxidation resistance, good mechanical properties under high temperature conditions, etc., in rocket engines, aero engines It has broad application prospects on high temperature thermal structural components. Usually under high temperature and dry environment conditions, a dense layer of SiO will be formed on the surface of silicon-based non-oxide ceramics. 2 Thin film, which can block the diffusion channel between oxygen atoms and silicon-based ceramics, and improve the oxidation resistance of materials[R.Riedel,H.Kleebe,H.Schonfelder,F.Aldinger,A cova...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/50C04B35/16C04B35/624C04B35/64C01B33/20
CPCC01B33/20C01P2002/72C01P2004/03C01P2004/62C04B35/16C04B35/50C04B35/622C04B35/624C04B35/64
Inventor 曹丽云雍翔黄剑锋周磊李翠艳欧阳海波费杰吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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