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

Synthesis technology of silicon carbide whisker

A technology of silicon carbide whisker and synthesis process, which is applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve the problem of not being used well, and achieve the effect of improving the utilization rate

Inactive Publication Date: 2016-08-24
任海涛
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rice straw is a by-product of rice production, except for papermaking, feed, and fuel combustion, it has not been well utilized

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

[0015] The synthetic technique of the silicon carbide whisker of embodiment 1, comprises the following steps:

[0016] S1: The straw is chopped to 1-2 cm, pickled with 20% hydrochloric acid, washed until neutral, and dried in a drying oven;

[0017] S2: carbonize the dried straw in a vacuum sintering furnace at 460°C for 1.5 hours and cool down in the furnace to obtain rice straw charcoal;

[0018] S3: Mix rice straw charcoal, silicon powder and catalyst evenly into a graphite crucible, put it into a vacuum sintering furnace, pass in argon protection, raise the temperature to 1350-1600°C, and keep it warm for 1.5 hours;

[0019] Catalyst is iron powder and NaF, and the percentage that the consumption of catalyst accounts for the sum of straw charcoal and silicon powder quality is 3%.

[0020] Wherein, the particle size of silicon powder is 74 μm.

[0021] Wherein, in S3, the temperature is directly raised to 1600° C. and kept for 1.75 hours for reaction.

Embodiment 2

[0023] The synthetic technique of the silicon carbide whisker of embodiment 2, comprises the following steps:

[0024] S1: The straw is chopped to 1-2 cm, pickled with 20% hydrochloric acid, washed until neutral, and dried in a drying oven;

[0025] S2: carbonize the dried straw in a vacuum sintering furnace at 460°C for 1 hour and cool down in the furnace to obtain rice straw charcoal;

[0026] S3: Mix rice straw charcoal, silicon powder and catalyst evenly into a graphite crucible, put it into a vacuum sintering furnace, pass in argon protection, raise the temperature to 1350-1600°C, and keep it warm for 1 hour;

[0027] The catalyst is iron powder and NaF, and the consumption of the catalyst accounts for 2-4% of the sum of the mass of straw charcoal and silicon powder.

[0028] Wherein, the particle size of silicon powder is 72 μm.

[0029] Among them, the temperature in S3 is first raised to 1600°C, and then rapidly lowered to 1350°C, and the temperature is kept for 1.5 ...

Embodiment 3

[0031] The synthetic technique of the silicon carbide whisker of embodiment 3, comprises the following steps:

[0032] S1: The straw is chopped to 1-2 cm, pickled with 20% hydrochloric acid, washed until neutral, and dried in a drying oven;

[0033] S2: carbonize the dried straw in a vacuum sintering furnace at 460°C for 2 hours and cool down in the furnace to obtain rice straw charcoal;

[0034] S3: Mix rice straw charcoal, silicon powder and catalyst evenly into a graphite crucible, put it into a vacuum sintering furnace, pass it into argon protection, raise the temperature to 1350-1600°C, and keep it warm for 2 hours;

[0035] The catalyst is iron powder and NaF, and the consumption of the catalyst accounts for 2-4% of the sum of the mass of straw charcoal and silicon powder.

[0036] Among them, the particle size of silicon powder is 76 μm.

[0037] Among them, the temperature in S3 is directly raised to 1450, and the reaction is kept for 2 hours.

[0038] The outer sur...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a synthesis technology of silicon carbide whisker. The technology comprises the steps such as cutting and acid washing of straw, preparation of straw charcoal and high-temperature preparation of silicon carbide whisker. Straw and silicon powder can be used for primarily preparing beta-type SiCw, the whisker mainly consists of smooth straight crystals, and the diameter is 20-100nm; and the whisker has the plane defects such as twin crystal. In the invention, the utilization rate of the waste straw can be increased, and current situation that pollutants such as inhalable particles are generated by the burning of the straw serving as fuel is avoided.

Description

technical field [0001] The invention relates to the field of silicon carbide whiskers, in particular to a synthesis process of silicon carbide whiskers. Background technique [0002] Silicon carbide whisker (SiCw) is a short fibrous single crystal with a diameter of nanometer to micrometer and a certain length-to-diameter ratio. It has a crystal structure similar to diamond and has light weight, high hardness, high elastic modulus, and Corrosion and high temperature oxidation resistance and specific optical and electrical properties. SiCw has become an important reinforcement and toughening material for new composite materials such as metal matrix and ceramic matrix, and has been widely used in national defense, aerospace, energy, chemical industry, automobile industry, environmental protection and other fields. The use of rice husks to prepare silicon carbide whiskers began in the 1970s. Cutler et al. invented the synthesis of SiCw from rice husks. Since then, the synthesi...

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): C30B29/36C30B29/62C30B1/10
Inventor 任海涛
Owner 任海涛
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com