Gelcasting method for high strength fused quartz ceramic

A technology of gel injection molding and fused silica, which is applied in the field of preparation of inorganic non-metallic materials, can solve the problems of difficult machining, large size molding, low mechanical strength of green bodies, etc., and achieve high density, high strength and excellent performance , good uniformity

Inactive Publication Date: 2015-11-18
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these gel systems are non-toxic, the mechanical strength of the prepared green body is too low, usually only 1-3 MPa or even lower, which is difficult to meet the requirements of machining and forming large-sized and complex-shaped parts.

Method used

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  • Gelcasting method for high strength fused quartz ceramic
  • Gelcasting method for high strength fused quartz ceramic
  • Gelcasting method for high strength fused quartz ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] With 61.89g fused silica powder (purity: 99.90%, d 50 : 2.53μm), 21.00g of deionized water, 0.12g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and 124.00g of grinding balls are added to the grinding tank, and are placed on a planetary ball mill at a speed of 200r / min Ball mill for 7 hours; then add 1.91g of glutinous rice flour and continue ball milling for 15 minutes; degas the milled slurry for 6 minutes in a vacuum environment of -0.15MPa, then inject it into a stainless steel mold and seal it; then put the stainless steel mold in a water bath and heat it at 80°C Constant temperature for 40 minutes to solidify the slurry; after demoulding the green body, first place it in a humid heat oven (30°C, 80% humidity) to dry for 18 hours, and then place it in an ordinary blast oven for 9 hours at 80°C; Sintering at 1250°C for 4 hours to obtain fused silica ceramics. The three-point bending strength of the fused silica green body obtained by this schem...

Embodiment 2

[0026] With 69.00g fused silica powder (purity: 99.93%, d 50 : 3.74μm), 18.00g of deionized water, 0.07g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and 138.00g of grinding balls were added to the grinding tank, and the speed was 220r / min on the planetary ball mill Ball mill for 5 hours; then add 1.41g of glutinous rice flour and continue ball milling for 10 minutes; degas the ball milled slurry for 10 minutes in a vacuum environment of -0.10MPa, then inject it into a stainless steel mold and seal it; then put the stainless steel mold in a water bath and heat it at 75°C Constant temperature for 1 hour to solidify the slurry; after demolding the green body, first place it in a humid heat oven (40°C, 100% humidity) to dry for 12 hours, and then place it in an ordinary blast oven for 12 hours at 70°C; Sintering at 1225°C for 4 hours to obtain fused silica ceramics. The three-point bending strength of the fused silica body obtained by using this scheme rea...

Embodiment 3

[0028] With 63.69g fused silica powder (purity: 99.93%, d 50 : 3.74 μm), 20g deionized water, 0.16g naphthalenesulfonic acid formaldehyde condensate and 128.00g grinding balls were added into the grinding tank, and ball milled on a planetary ball mill for 4h at a speed of 230r / min; then, 2.31g glutinous rice flour was added to continue ball milling 20min; the ball-milled slurry was defoamed for 15min in a vacuum environment of -0.10MPa, then poured into a stainless steel mold and sealed; then the stainless steel mold was placed in a water bath, and the slurry was solidified at a constant temperature of 70°C for 1.5h; the green body After demoulding, first place it in a humid heat oven (25°C, 60% humidity) to dry for 24 hours, then place it in a common blast oven at 90°C for 6 hours; the dried green body is sintered at 1225°C for 6 hours to obtain fused silica ceramics . The three-point bending strength of the fused silica body obtained by adopting this scheme reaches 11.2MPa....

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Abstract

The invention relates to a gelcasting method for a high strength fused quartz ceramic. The method is characterized in that by taking a non-toxic substance food grade glutinous rice flour as a gel, the high strength fused quartz ceramic is prepared through size grinding, vacuum defoaming, injection molding, blank curing, blank drying and ceramic sintering. According to the fused quartz prepared by using the non-toxic gel, a crosslinking agent, an initiator and a catalyst are not needed to be added. The prepared fused quartz blank is good in uniformity and high in strength and can meet the machining requirements, and the method is suitable for preparing large-sized abnormal fused quartz ceramic parts. The three-point bending strength of the fused quartz blank can reach the highest 11.4MPa. The three-point bending strength of the fused quartz ceramic sintered at 1220-1280 DEG C can reach the highest 65.9MPa. Less cristobalite phase in the ceramic is separated out, and the performance is excellent. The method provided by the invention is environmental-friendly, simple in process and low in cost, and the prepared fused quartz blank and ceramic are excellent performance and are suitable for industrial production and popularization.

Description

Technical field: [0001] The invention relates to the field of preparation of inorganic non-metallic materials, in particular to a gel injection molding method of high-strength fused silica ceramics. Background technique: [0002] Fused silica ceramics have an extremely low coefficient of linear expansion (0.56×10 -6 / °C) and excellent thermal shock resistance (more than 20 times of cold and heat cycles from room temperature to 1000°C without damage); has an extremely low and stable dielectric constant (dielectric constant is about 3.5, and can be used at room temperature to 1200°C The time change is less than 1% / 100℃), and the dielectric loss is also low (~10 -4 , room temperature); in addition, its high temperature viscosity is very large, and its thermal ablation resistance is excellent. Therefore, fused silica ceramics are widely used as structural and functional materials in many fields of national economy and national defense and military industry. Its main products ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/622
Inventor 万维杨建冯永宝丘泰
Owner NANJING TECH UNIV
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