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Special bismuth stearate-coated lead lanthanum zirconate titanate powder injection molding material and preparation method thereof

A technology of powder injection molding and lead lanthanum zirconate titanate, which is applied in the field of powder injection molding technology and piezoelectric ceramics preparation, can solve problems such as adverse effects on piezoelectric performance and damage to crystal structure, and achieve good piezoelectric performance and doping efficiency high effect

Active Publication Date: 2019-08-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For piezoelectric ceramics, the doping of silicon, titanium and other elements may destroy the original crystal structure and adversely affect the piezoelectric performance.

Method used

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  • Special bismuth stearate-coated lead lanthanum zirconate titanate powder injection molding material and preparation method thereof
  • Special bismuth stearate-coated lead lanthanum zirconate titanate powder injection molding material and preparation method thereof
  • Special bismuth stearate-coated lead lanthanum zirconate titanate powder injection molding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Bismuth stearate-coated PLZT powder injection molding special material and preparation method, including PLZT powder, powder modifier bismuth stearate and binder, the binder is composed of PEG, PVB, POM and lubricating aid paraffin ; The proportion of each component of the feed: PLZT powder 86.33%, polyethylene glycol (mixed by PEG20000 and PEG1500 in a mass ratio of 1:2) 7.15%, polyvinyl butyral (PVB) 2.15%, polyoxymethylene (POM ) 2.37%, powder modifier bismuth stearate 0.86%, and the balance is paraffin.

[0029] Mix the PLZT powder and bismuth stearate in proportion, and use a high-speed mixer to mix at 120°C for 20 minutes to complete the powder coating modification.

[0030] Mix the modified powder and binder in a certain proportion in the internal mixer evenly. The temperature of the internal mixer is set at 180°C and the speed is 30r / min. Extrusion granulation, temperature setting: 150°C, 160°C, 170°C, 175°C, 180°C, 180°C, 180°C, speed 150rpm, granulation, prep...

Embodiment 2

[0033] Bismuth stearate-coated PLZT powder injection molding special material and preparation method, including PLZT powder, powder modifier bismuth stearate and binder, the binder is mixed with PEG, PVB, POM and lubricant additive PE wax Composition; The ratio of each component of the feeding material: PLZT powder 86.33%, polyethylene glycol (mixed by PEG20000 and PEG1500 in a mass ratio of 1:3) 7.15%, polyvinyl butyral (PVB) 2.15%, polyoxymethylene ( POM) 2.37%, powder modifier bismuth stearate 0.86%, and the balance is PE wax.

[0034] Mix the PLZT powder and bismuth stearate in proportion, and use a high-speed mixer to mix at 120°C for 20 minutes to complete the powder coating modification.

[0035] Mix the modified powder and binder in a certain proportion in the internal mixer evenly. The temperature of the internal mixer is set at 180°C and the speed is 30r / min. Extrusion granulation, temperature setting: 150°C, 160°C, 170°C, 175°C, 180°C, 180°C, 180°C, speed 150rpm, gra...

Embodiment 3

[0038] Bismuth stearate coated PLZT powder injection molding special material and preparation method, including PLZT powder, powder modifier bismuth stearate and binding agent, binding agent is made of PEG, PVB, POM and lubricating aid (paraffin and PE wax mass ratio 1:1 mixed) mixing composition; feeding components ratio: PLZT powder 86.33%, polyethylene glycol (by PEG20000 and PEG1500 mass ratio is 1:2 mixed) 7.15%, polyvinyl butyral Aldehyde (PVB) 2.58%, polyoxymethylene (POM) 2.02%, powder modifier bismuth stearate 3.81%, and the balance is a mixture of paraffin wax and PE wax with a mass ratio of 1:1.

[0039] Mix the PLZT powder and bismuth stearate in proportion, and use a high-speed mixer to mix at 120°C for 20 minutes to complete the powder coating modification.

[0040] Mix the coated and modified powder and binder in a certain proportion in the internal mixer evenly. The temperature of the internal mixer is set at 180°C and the speed is 30r / min. The extruder is ext...

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Abstract

The invention relates to a special bismuth stearate-coated lead lanthanum zirconate titanate powder injection molding material and a preparation method thereof. The material comprises the following components: 86.87-88.99% of PLZT powder, 6.01-7.88% of polyethylene glycol, 2.00-2.62% of polyvinyl butyral, 2.00-2.62% of polyformaldehyde and 0.50-4.00% of a powder modifier, with the balance being alubrication aid. The preparation method comprises the following steps: subjecting the PLZT powder to surface treatment with bismuth stearate; after batching, carrying out mixing in an internal mixer;performing crushing, extrusion, granulation and injection molding; and performing first-step degreasing in deionized water, and carrying out sintering to form porcelain. According to the invention, the PLZT powder is coated with bismuth stearate, so the viscosity of a feed is reduced, the compactness of a finished product after sintering is greatly improved, the problem of agglomeration of fine powder in injection molding is solved, and the dielectric constant and piezoelectric properties of a PLZT piezoelectric ceramic are improved.

Description

technical field [0001] The invention relates to powder injection molding technology and piezoelectric ceramic preparation technology, in particular to a powder injection molding technology and preparation method of bismuth stearate-coated lead lanthanum zirconate titanate (PLZT). Background technique [0002] Powder injection molding is a new type of near-net molding technology developed on the basis of plastic injection molding and powder metallurgy. The mixture of metal or inorganic powder and binder is used as the feed material, and the fluid feed material is injected into the cavity of the mold under a certain pressure, temperature and speed by means of an injection machine, cooled to obtain an injection green body, and then degreased and sintered And simple subsequent processing to obtain finished products. The surface quality of the product is good, the density is high, the precision is high, and it is easy to realize automatic production. [0003] For the problems o...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/50C04B35/634
CPCC04B35/491C04B35/50C04B2235/48C04B2235/3251C04B35/63488C04B35/6342C04B35/63472C04B2235/61C04B2235/77
Inventor 吴盾刘春林秦帅成骏峰曹峥
Owner CHANGZHOU UNIV
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