Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of alumina ceramics for automobile pressure sensor

A technology of alumina ceramics and pressure sensors is applied in the field of preparation of alumina ceramics for automobile pressure sensors, which can solve the problems of low flexural strength and fracture toughness, achieve good thermal stability, improve particle size uniformity, and have no mechanical hysteresis. Effect

Active Publication Date: 2020-11-06
HUNAN MEICHENG CERAMIC TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing alumina ceramic preparation technology makes alumina ceramics have high mechanical strength, but their flexural strength and fracture toughness are still not high.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. 95wt% α-Al 2 o 3 , 2wt% of kaolin, 2wt% of calcium carbonate, 0.5wt% of silicon dioxide and 0.5wt% of zirconium silicate are formulated as raw materials, and then uniformly mixed with PVA17-99 accounting for 1wt% of raw materials as a binder and accounting for 0.3% of raw materials The n-octanol of wt% is used as defoamer;

[0022] B. Ball milling makes the raw material particle size reach 1.3μm;

[0023] C, spray granulation, then by weight 100 parts of granulation powder, mass ratio are 1:2 oleic acid and 1.2 parts of kerosene, 0.4 part of liquid paraffin and 0.2 part of release agent ZUSOPLASTO59 mix homogeneously;

[0024] D. Dry pressing at 98MPa and then sintering. The process is as follows: the first temperature zone is 260°C, the second temperature zone is 430°C, the third temperature zone is 700°C, the fourth temperature zone is 1120°C, the fifth temperature zone is 1450°C, and the sixth temperature zone is 1600°C. ℃, the seventh temperature zone is 1700 ...

Embodiment 2

[0036] A. 97wt% α-Al 2 o 3 , 1wt% of kaolin, 0.5wt% of calcium carbonate, 1wt% of silicon dioxide and 0.5wt% of zirconium silicate are formulated as raw materials, and then uniformly mixed with PVA17-99 accounting for 1.5wt% of raw materials as binder and accounting for raw materials 0.5wt% n-octanol as defoamer;

[0037] B. Ball milling makes the raw material particle size reach 1.8μm;

[0038] C, spray granulation, then 100 parts by weight of granulation powder, 1.8 parts of oleic acid and kerosene, 0.7 part of liquid paraffin and 0.8 part of release agent ZUSOPLASTO59 that the mass ratio is 1: 2 are mixed evenly;

[0039]D. Dry pressing at 120MPa and then sintering. The process is as follows: the first temperature zone is 260°C, the second temperature zone is 430°C, the third temperature zone is 700°C, the fourth temperature zone is 1120°C, the fifth temperature zone is 1450°C, and the sixth temperature zone is 1600°C. ℃, the seventh temperature zone is 1720°C, the eight...

Embodiment 3

[0051] A. 96wt% α-Al 2 o 3 , 1.5wt% of kaolin, 1.2wt% of calcium carbonate, 1wt% of silicon dioxide and 0.3wt% of zirconium silicate are formulated as raw materials, and then uniformly mixed with PVA17-99 accounting for 14wt% of raw materials as binder and accounting for raw materials 0.4wt% n-octanol as defoamer;

[0052] B. Ball milling makes the raw material particle size reach 1.5μm;

[0053] C, spray granulation, then by weight 100 parts of granulation powder, mass ratio are 1: 2 oleic acid and 1.6 parts of kerosene, 0.5 part of liquid paraffin and 0.4 part of release agent ZUSOPLASTO59 mix homogeneously;

[0054] D. Dry pressing at 100MPa and then sintering. The process is as follows: the first temperature zone is 260°C, the second temperature zone is 430°C, the third temperature zone is 700°C, the fourth temperature zone is 1120°C, the fifth temperature zone is 1450°C, and the sixth temperature zone is 1600°C. ℃, the seventh temperature zone is 1700 ℃, the eighth tem...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of alumina ceramics for automotive pressure sensors. The preparation method comprises the following steps: A, preparing a raw material from 95-97 wt% of alpha-Al2O3, 1-2 wt% of kaolin, 0.5-2 wt% of calcium carbonate, 0.5-1 wt% of silica and 0.3-0.7 wt% of zirconium silicate, and uniformly mixing PVA17-99 and n-octyl alcohol; B, ball-milling; C, conducting spray granulation; D, dry-pressing and sintering; E, vibro-milling; and F, surface metallization. Through methods of using alumina ceramics as a matrix, adding zirconium silicate, improving ball-milling mode and conducting surface second metallization, density of the ceramic product reaches 3.69 g / cm<3> or above; elasticity modulus reaches about 310 Gpa; coefficient of thermal expansion is about 5*10<-6> / DEG C (from 25-500 DEG C); and flexural strength is about 288 Mpa.

Description

technical field [0001] The invention relates to a preparation method of alumina ceramics for automobile pressure sensors. Background technique [0002] Most of the existing sensors are resistance strain type and silicon diffusion sheet type, mostly using silicon material, which has the disadvantages of large volume, large creep, poor impact resistance, poor overvoltage resistance, and low precision; alumina ceramic material has zero mechanical Hysteresis performance, as a sensor material can greatly improve creep and mechanical hysteresis. At the same time, alumina ceramics have strong resistance to acid and alkali corrosion. After being placed in a strong acid and alkali solution for 1000 hours, the surface of alumina ceramics does not change, and its application field is wide. However, the existing alumina ceramic preparation technology makes alumina ceramics have high mechanical strength, but their flexural strength and fracture toughness are still not high. Therefore, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/622C04B41/90
CPCC04B35/117C04B35/622C04B41/52C04B41/90C04B2235/3208C04B2235/3248C04B2235/3418C04B2235/349C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B41/5138C04B41/5041C04B41/5035C04B41/5031C04B41/5027C04B41/0072
Inventor 方豪杰贺亦文
Owner HUNAN MEICHENG CERAMIC TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com