Unlock instant, AI-driven research and patent intelligence for your innovation.

Silicon carbide-graphite riser tube and preparation method thereof

A riser tube and silicon carbide technology, applied in the field of refractory materials, can solve the problems of product damage, material mechanics and thermal shock resistance degradation, etc., and achieve the effect of improving density, low cost and good thermal shock performance

Active Publication Date: 2017-09-08
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum titanate is easy to decompose into α-Al at 750~1300°C. 2 o 3 and rutile TiO 2 , leading to the reduction of material mechanics and thermal shock resistance, and product damage

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

[0020] Silicon carbide and graphite are the main raw materials, among which silicon carbide with a particle size of 2~1mm: 30%, silicon carbide with a particle size of 1~0mm 20%, graphite content 18%, and 6% metal silicon powder, 6% boron carbide, and 20% boron glass Boron glass powder (preparation method of boron glass: 25% potassium feldspar, 15% pyrophyllite, 50% borax, 10% silica, premixed in a vibrating ball mill tank for 10 hours, the ratio of balls: 1:2). The solid resin powder is used as a binder, the solvent is furfural, and the addition amount is 4% and 5% of the total amount of the above raw materials respectively. After kneading by a high-speed mixer and drying at 60°C, the volatile content of the billet is 0.9%. Static pressure molding, and finally heat treatment in a nitrogen atmosphere protection furnace, N 2 The content is greater than 99.999vol%, the temperature is raised to 950°C at 1°C / min, and the temperature is lowered to 600°C at 1°C / min for 300 minutes. ...

Embodiment 2

[0022] Silicon carbide and graphite are the main raw materials, among which silicon carbide with a particle size of 2~1mm: 33%, silicon carbide with a particle size of 1~0mm 20%, graphite content 15%, and 6% metal silicon powder, 10% boron carbide, and 16% boron glass Boron glass powder (preparation method of boron glass: 30% potassium feldspar, 10% pyrophyllite, 50% borax, 10% silica, premixed in a vibrating ball mill tank for 10 hours, the ratio of balls: 1:2). Solid resin powder is used as a binder, the solvent is furfural, and the addition amount is 3% and 4% of the total amount of the above raw materials respectively. After kneading by a high-speed mixer, 0.8% of the volatile content of the billet is obtained after drying at 65°C, and heated at 120MPa, etc. Static pressure molding, and finally heat treatment in a nitrogen atmosphere protection furnace, N 2 The content is greater than 99.999vol%, the temperature is raised to 1150°C at 1°C / min, and the temperature is lowere...

Embodiment 3

[0024] Silicon carbide and graphite are the main raw materials, among which silicon carbide with a particle size of 2~1mm: 33%, silicon carbide with a particle size of 1~0mm 10%, graphite content 25%, and 6% metal silicon powder, 10% boron carbide, and 16% boron glass Boron glass powder (preparation method of boron glass: 26% potassium feldspar, 17% pyrophyllite, 52% borax, 5% silica, premixed in a vibrating ball mill for 10 hours, the ratio of balls: 1:2). Solid resin powder is used as a binder, the solvent is furfural, and the addition amount is 6% and 7% of the total amount of the above raw materials respectively. After kneading by a high-speed mixer and drying at 70°C, the volatile content of the billet is 1.2%, and the volatile content of the billet is 120MPa. Static pressure molding, and finally heat treatment in a nitrogen atmosphere protection furnace, N 2 The content is greater than 99.999vol%, the temperature is raised to 1150°C at 1°C / min, and the temperature is low...

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
porosityaaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of refractory materials, and mainly relates to a silicon carbide-graphite riser tube and a preparation method thereof. The silicon carbide-graphite riser tube is characterized by being prepared by the following steps: bonding silicon carbide and graphite which have low expandability and are hard to sinter with phenolic resin as a binder in a furfuraldehyde solvent, introducing metallic silicon, boron carbide and boron glass powder, mixing in a high-speed mixer, controlling the proper volatile component of stock, performing high pressure forming in a hydraulic press, and performing heat treatment in a nitrogen atmosphere furnace. The main characteristics of the riser tube are as follows: riser tube has good shock resistance and high density (apparent porosity below 3%), can effectively meet the use requirements of the low-pressure casting industry for the riser tube, and can replace the currently widely used low-casting efficiency cast iron riser tubes as well as riser tubes which are made of silicon nitride in combination with silicon carbide or aluminum titanate and have high performance but high cost.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and mainly relates to a silicon carbide-graphite liquid riser and a preparation method thereof. Background technique [0002] The low-pressure casting riser is one of the key components of the low-pressure casting machine. During operation, the molten aluminum (temperature 700~900°C) is pressed from the riser to the mold cavity every 3~5 minutes. This working condition requires the component to have properties such as high temperature resistance, thermal shock resistance, non-wetting with molten metal, good air tightness and long-term thermal shock fatigue resistance. At present, the riser pipes for domestic aluminum casting are mainly cast iron riser pipes, and the infiltration of iron in molten aluminum will greatly reduce the quality of cast aluminum parts. Ceramic risers are often used in foreign countries, such as Si in Japan. 3 N 4 The reaction combined with the SiC ceramic ...

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 Applications(China)
IPC IPC(8): C04B35/66C04B35/567C04B35/634C03C12/00C04B35/632C04B35/622
CPCC03C12/00C04B35/565C04B35/622C04B35/632C04B35/63476C04B35/66C04B2235/36C04B2235/3821C04B2235/425C04B2235/428C04B2235/96C04B2235/9607
Inventor 钱凡李红霞杨文刚黄辉于建宾马天飞刘国齐
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES