Nanometer crystal blue ceramic corundum abrasive and preparation method thereof

A technology of ceramic corundum and nanocrystals, which is applied in the field of grinding abrasives, can solve the problems of damage to abrasive strength, toughness and self-sharpening mechanical properties, high activation energy of sintering diffusion, and influence on microstructure, etc., to achieve uniform microstructure The effect of densification, widening the selection range, and lowering the firing temperature

Active Publication Date: 2016-11-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high sintering diffusion activation energy of pure alumina, it is difficult to sinter at low temperature, and it is easy to cause abnormal grain growth at high temperature, which affects its microstructure, and then damages a series of mechanical properties such as abrasive strength, toughness and self-sharpness. performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 32.67gAl 2 (SO 4 ) 3 18H 2 O dissolves in water to form Al 3+ A solution with a concentration of 0.4mol / L;

[0022] Add ammonia water with a concentration of 1mol / L 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;

[0023] Add 0.2wt% of external additives to Al(OH) 3 In the gel precursor, water is used as the medium, and corundum balls are used to make it fully mixed by wet ball milling; the composition and mass percentage content of the additive are: 8% Co(NO 3 ) 2 ·6H 2 O, 59% C 16 h 36 o 4 Ti, 23%Si(OC 2 h 5 ) 4 , 10% (NH 4 ) 3 AlF 6 ;

[0024] Dry the wet gel after ball milling at 80°C to obtain a dry gel, and then granulate and sieve to obtain precursor particles;

[0025] The precursor particles were calcined at 1200°C for 1.5h, and then sieved and classified to obtain ceramic corund...

Embodiment 2

[0028] Take 36.76gAl(NO 3 ) 3 9H 2 O dissolves in water to form Al 3+ The concentration is 0.5mol / L solution;

[0029] Add ammonia water with a concentration of 1mol / L to the above solution, keep stirring, control the pH to 9.8, 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;

[0030] Add 0.8wt% of external additives to Al(OH) 3 In the gel precursor, water is used as the medium, and corundum balls are used to make it fully mixed by wet ball milling; the composition and mass percentage content of the additive are: 19% Co(NO 3 ) 2 ·6H 2 O, 46%C 16 h 36 o 4 Ti, 24%Si(OC 2 h5 ) 4 , 11% (NH 4 ) 3 AlF 6 ;

[0031] Dry the wet gel after ball milling at 80°C to obtain a dry gel, and then granulate and sieve to obtain precursor particles;

[0032] The precursor particles were calcined at 1300°C for 1 hour, and then sieved and classified to obtain ceramic corundum abrasiv...

Embodiment 3

[0035] Take 32.67gAl 2 (SO 4 ) 3 18H 2 O dissolves in water to form Al 3+ The concentration is 0.6mol / L solution;

[0036] Add ammonia water with a concentration of 1mol / L 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;

[0037] Add 0.54wt% of external additives to Al(OH) 3 In the gel precursor, water is used as the medium, and corundum balls are used to make it fully mixed by wet ball milling; the composition and mass percentage content of the additive are: 18% Co(NO 3 ) 2 ·6H 2 O, 50% C 16 h 36 o 4 Ti, 24% Mg(NO 3 ) 2 ·6H 2 O, 8% (NH 4 ) 3 AlF 6 0~30%;

[0038] Dry the wet gel after ball milling at 80°C to obtain a dry gel, and then granulate and sieve to obtain precursor particles;

[0039] The precursor particles were calcined at 1300°C for 2 hours, and then sieved and classified to obtain ceram...

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Abstract

The invention discloses a nanometer crystal blue ceramic corundum abrasive and a preparation method thereof. A sol-gel method is adopted for preparing an aluminiferous precursor, an additive is introduced, and granulation, sieving, calcination and other technologies are adopted for obtaining the ceramic corundum abrasive. Al2(SO4)3.18H2O or Al(NO3)3.9H2O is adopted as a raw material, an additional additive accounts for 0.15-0.8% of the raw material by mass, the additive is prepared from 5-25% of Co(NO3)2.6H2O, 5-20% of (NH4)3AlF6, 0-65% of C16H36O4Ti, 0-40% of Si(OC2H5)4, 0-50% of Mg(NO3)2.6H2O and 0-20% of Ca(NO3)2.4H2O. According to the nanometer crystal blue ceramic corundum abrasive, the color development characteristic of the corundum abrasive is changed, the production temperature is lowered by 400-800 DEG C compared with an electric smelting method, the microscopic structure inside the corundum abrasive is optimized, the compressive strength of a single particle can reach 58.6 N, the impact toughness is improved by 15-25% compared with an existing ceramic corundum abrasive, the grinding efficiency of an obtained ceramic corundum grinding wheel is improved by 55% or above compared with a common corundum wheel, and the service life is correspondingly prolonged.

Description

technical field [0001] The invention relates to grinding abrasives, in particular to a nanocrystalline blue ceramic corundum abrasive and a preparation method thereof. Background technique [0002] Artificial corundum abrasives have developed rapidly since they were first successfully developed at the end of the 19th century, and have been widely used due to their good mechanical properties, high-temperature grinding stability, and wide range of processing objects. Artificial corundum can be divided into brown corundum, black corundum, white corundum, chromium corundum, zirconium corundum, praseodymium neodymium corundum, bauxite sintered corundum, single crystal corundum and other varieties according to its impurity ion content and crystal form. Since this kind of corundum abrasive does not fundamentally change the preparation method of electric fusion, it not only has high energy consumption, but also has a large grain size and poor grinding performance, so its application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/624C09K3/14
CPCC04B35/10C04B35/624C04B2235/3206C04B2235/3208C04B2235/3275C04B2235/445C04B2235/48C04B2235/483C04B2235/781C04B2235/785C04B2235/96C09K3/1436
Inventor 李志宏王津松朱玉梅
Owner TIANJIN UNIV
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