Method for increasing yield of SiC nano fiber by applying boric acid

A nanofiber and boric acid application technology, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve problems such as low yield and unapplied boric acid

Inactive Publication Date: 2009-12-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem of low yield in the existing SiC nanofiber preparation method and the problem that boric acid has not been applied to the SiC nanofiber production field, and provides a method for increasing the yield of silicon carbide nanofibers by using boric acid

Method used

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  • Method for increasing yield of SiC nano fiber by applying boric acid
  • Method for increasing yield of SiC nano fiber by applying boric acid

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specific Embodiment approach 1

[0015] Embodiment 1: The method of using boric acid to increase the yield of SiC nanofibers in this embodiment is carried out according to the following steps: 1. The ratio of sucrose and silica sol is 4: 1 according to the ratio of carbon moles in sucrose to silicon moles in silica sol Mix the proportion of boric acid, and then add boric acid to the mixed solution of sucrose and silica sol, so that the mass fraction of boric acid in the mixed liquid is 0.5% to 5%, then stir at a speed of 600 to 1000r / min for 90 to 240min, and then Dry at 80-120°C for 4-8 hours to obtain xerogels; 2. Put the xerogels obtained in step 1 into a tube furnace, feed nitrogen and make the nitrogen flow 0.8-1.5L / min, Raise the temperature at a rate of 10°C / min, and keep it at 900°C for 1 hour to obtain gel powder; 3. Use a planetary ball mill to mill the gel powder at a speed of 200r / min for 2 to 4 hours, and dissolve absolute ethanol According to the ratio of adding 2mL ethanol per gram of ball-mill...

specific Embodiment approach 2

[0016] Embodiment 2: The difference between this embodiment and Embodiment 1 is: in step 1, boric acid is added to the mixture of sucrose and silica sol, so that the mass fraction of boric acid is 1-4%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0017] Embodiment 3: The difference between this embodiment and Embodiment 1 is: in step 1, boric acid is added to the mixture of sucrose and silica sol, so that the mass fraction of boric acid is 2-3%. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a method for increasing the yield of an SiC nano fiber by applying boric acid and relates to an application method of the boric acid, solving the problems that the existing SiC nano fiber preparation method has the defect of low yield, and the boric acid is not applied to the production field of the SiC nano fiber. The method for increasing the yield of the SiC nano fiber by applying the boric acid is carried out according to the following steps that: 1, sucrose and silicasol are mixed, then boric acid is added into the mixed liquid, the mixed liquid is dried, and xerogel is obtained; 2, the xerogel obtained in the step 1 is put in a tubular furnace, nitrogen gas is introduced into the tubular furnace, the temperature of the tubular furnace is raised and kept, and gel powder is obtained; and 3, ball milling is carried out for 3 hours, absolute ethyl alcohol is added, an atmosphere sintering furnace is adopted, and the furnace is cooled to room temperature to obtain an SiC nano floss layer in the shape of wool felt. The invention applies the boric acid in the production of the nano fiber, the yield of the SiC nano fiber is increased by more than 10 times after the boric acid is applied, and the fiber length reaches 5 to 6cm.

Description

technical field [0001] The invention relates to a method for applying boric acid. Background technique [0002] Boric acid is an important industrial raw material, widely used in many fields of scientific research and industrial production. In the glass industry, boric acid can improve the heat resistance and transparency of glass products, increase the mechanical strength, and shorten the melting time; in the enamel and ceramic industries, boric acid can be used to enhance the luster and fastness of enamel products; In industry, boric acid can be used as an additive, co-solvent; in addition, boric acid can also be used as a preservative, pesticide and catalyst. Although boric acid has so many uses, it has never been applied to the production of SiC nanofibers. [0003] SiC nanofiber is an excellent one-dimensional nanomaterial with outstanding mechanical properties, electrical properties and photoelectric properties. It has great application prospects in the fields of rei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B82B3/00
Inventor 温广武张晓东朱建东黄小萧钟博张涛于洪明
Owner HARBIN INST OF TECH
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