Microscopic layered interlocked nanocrystalline ceramic corundum abrasive and preparation method thereof

A technology of ceramic corundum and nanocrystals, applied in chemical instruments and methods, and other chemical processes, can solve problems such as low toughness and single microscopic morphology, and achieve the effects of improving abrasive performance, reducing firing temperature, and reducing production temperature

Inactive Publication Date: 2018-01-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages and deficiencies of the existing products, such as single microscopic appearance and low toughness, by using a new additive system and improving the preparation process, thereby effectively reducing the firing temperature of the product and controlling the microscopic grain size of the abrasive Morphology improves the performance of abrasive products, provides a layered interlocking nanocrystalline ceramic corundum abrasive with uniform microstructure and reduced energy consumption, and its preparation method

Method used

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  • Microscopic layered interlocked nanocrystalline ceramic corundum abrasive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 90.00gAl(NO 3 ) 3 9H 2 O, 6.45g PEG1000 dissolved in water, dubbed Al 3+ A solution with a concentration of 0.35mol / L;

[0026] Slowly add diluted ammonia water dropwise to the above solution, keep stirring, control the pH to 9.2, make it continue to react until it is completely gelled, and then undergo suction filtration and repeated washing to obtain Al(OH) 3 Gel precursor.

[0027] Add 0.15wt% (0.135g) additive to Al(OH) 3 Into the gel precursor, 0.40wt% (0.360g) alumina seeds were added. Using corundum balls, wet ball milling to make it fully mixed; the composition and mass percentage content of the additives are: 55.5% C 16 h 36 o 4 Ti, 22.3% CaF 2 , 11.1% Y (NO 3 ) 3 ·6H 2 O, 11.1% Ce(NO 3 ) 3 ·6H 2 O.

[0028] The ball-milled wet gel was dried at 50°C to obtain a dry gel, and then crushed, granulated, and sieved to obtain sintered precursor particles.

[0029] The precursor particles are calcined at 1400°C, and then sieved to obtain ceramic ...

Embodiment 2

[0032] Take 90.00gAl(NO 3 ) 3 9H 2O, 6.45g PEG1000 dissolved in water, dissolved in water, dubbed Al 3+ A solution with a concentration of 0.40mol / L.

[0033] Slowly add diluted ammonia water dropwise to the above solution, keep stirring, control the pH to 9.4, make it continue to react until it is completely gelled, and then undergo suction filtration and repeated washing to obtain Al(OH) 3 Gel precursor.

[0034] Add 0.30wt% (0.270g) additive to Al(OH) 3 Into the gel precursor, 0.50wt% (0.450g) alumina seeds were added. Using corundum balls, wet ball milling to make it fully mixed; the composition and mass percentage content of the additives are: 45.4% C 16 h 36 o 4 Ti, 27.3% CaF 2 , 7.3% Y (NO 3 ) 3 ·6H 2 O,20%Ce(NO 3 ) 3 ·6H 2 O.

[0035] The wet gel after ball milling was dried at 70° C. to obtain a dry gel, and then crushed, granulated, and sieved to obtain sintered precursor particles.

[0036] The precursor particles are calcined at 1350°C, and then si...

Embodiment 3

[0039] Take 90.00gAl(NO 3 ) 3 9H 2 O, 6.45g PEG1000 dissolved in water, dubbed Al 3+ A solution with a concentration of 0.50mol / L;

[0040] Slowly add diluted ammonia water dropwise to the above solution, keep stirring, control the pH to 9.6, make it continue to react until it is completely gelled, and then undergo suction filtration and repeated washing to obtain Al(OH) 3 Gel precursor.

[0041] Add 0.50wt% (0.450g) additive to Al(OH) 3 Into the gel precursor, 0.40wt% (0.360g) alumina seeds were added. Using corundum balls, wet ball milling to make it fully mixed; the composition and mass percentage content of the additives are: 38.5%C 16 h 36 o 4 Ti, 23.0% CaF 2 , 30%Y (NO 3 ) 3 ·6H 2 O, 8.5% Y (NO 3 ) 3 ·6H 2 O.

[0042] The ball-milled wet gel was dried at 90°C to obtain a dry gel, and then crushed, granulated, and sieved to obtain sintered precursor particles.

[0043] The precursor particles are calcined at 1300°C, and then sieved to obtain ceramic corun...

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Abstract

The invention discloses a microscopic layered interlocked nanocrystalline ceramic corundum abrasive and a preparation method thereof. According to the invention, Al(NO3)3.9H2O is taken as a raw material, PEG1000 is taken as a dispersant, self-made alumina seed crystal accounts for 0.40-0.50% of mass fraction of the raw material, an applied additive accounts for 0.15-0.75% of mass percentage content of the raw material, the raw material composition of the additive with the mass percentage content of the raw material comprises 0-40% of Y(NO3)3.6H2O, 0-40% of Ce(NO3)3.6H2O, 0-50% of CaF2, and 20-65% of C16H36O4Ti. The method controls the microstructure characteristic of the ceramic corundum abrasive, compact layered crystal grains which are mutually interpenetrated are uniformly arranged in the corundum abrasive, the average size of a radius-length of the crystal grains in the abrasive particles is between 600-1300 nm, and the thickness of the crystal grain sheet layer is between 50 nm and 280 nm; and the radius-thickness ratio of the crystal grains (fineness ratio thickness) is between 3 and 11. By controlling a microscopic structure, the mechanical properties such as fracture toughness, the compressive strength and self-sharpening performance of the corundum abrasive are increased; and the single particle compressive strength can reach 41N.

Description

technical field [0001] The invention relates to a ceramic composition characterized by components, and mainly relates to a microscopic layered interlocking nanocrystalline ceramic corundum abrasive and a preparation method thereof. Background technique [0002] Artificial corundum abrasives have made great progress since they were first successfully developed at the end of the 19th century. Due to their good mechanical properties, high grinding efficiency, high-temperature grinding stability, and a wide range of processing objects, they have been widely used. Applications. After the large-scale industrial production of artificial corundum, many varieties of corundum abrasives have appeared. According to the type and content of impurity ions contained in artificial corundum abrasives and the difference in crystal structure, they can be divided into brown corundum, black corundum, and white corundum. , chromium corundum, zirconium corundum, bauxite sintered corundum, single c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/117C04B35/622C09K3/14
Inventor 李志宏游佳丽朱玉梅
Owner TIANJIN UNIV
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