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A special material for powder injection molding of bismuth stearate-coated lead lanthanum zirconate titanate and its preparation method

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

Active Publication Date: 2022-02-11
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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  • A special material for powder injection molding of bismuth stearate-coated lead lanthanum zirconate titanate and its preparation method
  • A special material for powder injection molding of bismuth stearate-coated lead lanthanum zirconate titanate and its preparation method
  • A special material for powder injection molding of bismuth stearate-coated lead lanthanum zirconate titanate and its preparation method

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 material for powder injection molding of bismuth stearate-coated lead lanthanum zirconate titanate and a preparation method, comprising the following raw materials: PLZT powder 86.87-88.99%, polyethylene glycol 6.01-7.88%, polyethylene 2.00-2.62% of alcohol butyral, 2.00-2.62% of polyoxymethylene, 0.50-4.00% of powder modifier, and the balance is lubricating aid. The preparation method uses bismuth stearate to carry out surface treatment on PLZT powder. After batching, it is mixed in an internal mixer, crushed, extruded, granulated, and injected into molding, and the first step is degreased in deionized water, and then sintered into porcelain. The present invention coats the PLZT powder with bismuth stearate, reduces the viscosity of the feed material, greatly improves the compactness of the finished product after sintering, solves the problem of agglomeration of the fine powder in the injection molding process, and improves the dielectric properties of the PLZT piezoelectric ceramics. Electrical constant and piezoelectric properties.

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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Patent Type & Authority Patents(China)
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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