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Preparation method of boron nitride nanotube-intensified silicon oxide ceramic

A technology of boron nitride nanotubes and silicon dioxide, which is applied in the field of preparation of silicon dioxide ceramics, can solve problems such as difficulty in ensuring uniform dispersion, poor uniformity of mixed powder, and complicated operation engineering, so as to facilitate large-scale production, Improved bending strength and good process safety

Active Publication Date: 2010-09-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect of phase transformation, whisker and particle toughening is not particularly obvious; the operation engineering of fiber toughening is more complicated, not easy to operate, and the product density is poor; at present, many people use carbon nanotubes to toughen ceramics, but carbon The high-temperature oxidation of nanotubes and the easy reaction with matrix materials at high temperatures limit its application.
[0005] The traditional mixing process of ceramics is difficult to ensure uniform dispersion, which makes the performance of ceramics unstable, and the repeatability of the experimental conclusions is poor. Using surfactants to disperse materials can make boron nitride nanotubes more uniformly dispersed, and silica powder The body is not easy to agglomerate, so that the various properties of ceramics are more stable
[0006] The application number is 200910015758.1, which discloses the following technology in the Chinese patent application. The preparation method includes weighing raw materials, ball milling, sintering, heat preservation and cooling, and preparing finished products. However, the ball milling process uses a dry mixing process, and the uniformity of the mixed powder is relatively poor. Affect the quality of the product; no protective atmosphere is used in the sintering process, which affects the quality of the product; and in the process of preparing the finished product, the efficiency is low and the quality is poor

Method used

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Effect test

Embodiment 1

[0034] Example 1: Boron nitride nanotubes are used as reinforcing phase, and nano-sized silicon dioxide and micron-sized silicon dioxide are used as substrates to prepare silicon dioxide ceramics by hot pressing and sintering.

[0035] First, the boron nitride nanotubes were washed three times with analytically pure hydrochloric acid, then three times with deionized water, and then put into a drying oven at 45° C. for 23 h.

[0036] Then use an electronic balance to weigh 1g of boron nitride nanotubes, 3g of nano-sized silicon dioxide and 16g of micron-sized silicon dioxide, pretreat the boron nitride nanotubes and use ultrasonic dispersion, and the surfactant is hexadecyltrimethyl Ammonium bromide, and cetyltrimethylammonium bromide mass is 0.0416g, the dispersion medium is ethanol, and the volume is 100ml. Silica is dispersed by stirring, the surfactant is sodium dodecylsulfonate, and the quality of sodium dodecylsulfonate is 0.7917g, the dispersion medium is ethanol, and th...

Embodiment 2

[0037] Example 2: Boron nitride nanotubes were used as reinforcing phase, and nano-sized silicon dioxide and micron-sized silicon dioxide were used as substrates to prepare silicon dioxide ceramics by hot pressing and sintering.

[0038] First, the boron nitride nanotubes were washed three times with analytically pure hydrochloric acid, then three times with deionized water, and then put into a drying oven to dry at 50° C. for 24 h.

[0039]Weigh 0.8g of boron nitride nanotubes, 2.8g of nano-scale silicon dioxide and 16.4g of micron-scale silicon dioxide with an electronic balance, pretreat the boron nitride nanotubes and disperse them ultrasonically, and the surfactant is hexadecane trimethylammonium bromide, and the mass ratio of hexadecyltrimethylammonium bromide to boron nitride nanotubes is 0.0333g, the dispersion medium is ethanol, and the volume is 90ml. Silica is dispersed by stirring, the surfactant is sodium dodecylsulfonate, and the quality of sodium dodecylsulfonat...

Embodiment 3

[0040] Example 3: Boron nitride nanotubes were used as reinforcing phases, and nano-sized silicon dioxide and micron-sized silicon dioxide were used as substrates to prepare silicon dioxide ceramics by hot pressing and sintering.

[0041] Firstly, the boron nitride nanotubes were washed three times with analytically pure hydrochloric acid, then washed three times with deionized water, and then put into a drying oven to dry at 55° C. for 25 h.

[0042] Weigh 0.9g of boron nitride nanotubes, 3g of nano-sized silicon dioxide and 16.1g of micron-sized silicon dioxide with an electronic balance, pretreat the boron nitride nanotubes and disperse them ultrasonically, and the surfactant is hexadecyl Trimethylammonium bromide, and the mass ratio of hexadecyltrimethylammonium bromide to boron nitride nanotubes is 0.0625g, the dispersion medium is ethanol, and the volume is 110ml. Silica is dispersed by stirring, the surfactant is sodium dodecylsulfonate, and the quality of sodium dodecy...

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Abstract

The invention relates to a preparation method of a boron nitride nanotube-intensified silicon oxide ceramic, which comprises the following steps of: A. pre-treating boron nitride nanotubes; B. weighing the boron nitride nanotubes and nano-grade and micron-grade silicon oxides; C. treating with different surface active agents; D. adding to a ball-milling pot, and compounding; E. drying, and screening; F. carrying out the hot pressed sintering in a multifunctional high-temperature sintering furnace in the shielding gas atmosphere; G. maintaining the temperature, then stopping heating, and naturally cooling to the room temperature; and H. machining the sintered ceramic block, and then testing the performance. The invention is a method which effectively improves the mechanical property of the silicon oxide, and greatly improves the mechanical property of the silicon oxide. The bend strength of the boron nitride nanotube-intensified silicon oxide ceramic is up to 130MPa, and is 6.5 times higher than that of the pure silicon oxide ceramic (19.6MPa).The process improves the mechanical property of the silicon oxide ceramic, and has the advantages of simple process, stability, high safety, easy operation and large scale production.

Description

[0001] technical field [0002] The invention relates to a method for preparing silicon dioxide ceramics, in particular to a method for preparing silicon dioxide ceramics reinforced with boron nitride nanotubes. Background technique [0003] Boron nitride nanotubes are energetically stable, have a constant wide energy gap (about 5.5eV), have high chemical stability and oxidation resistance, and the energy gap does not change with the change of chirality and tube layer number , and its oxidation temperature is as high as 900°C. These advantages make it widely used in high temperature, high-strength fibers, semiconductor materials, etc., especially in the strengthening and toughening of ceramic materials. [0004] Common ceramic toughening methods include: phase transformation toughening, whisker and particle toughening, fiber toughening, nanowire and nanotube toughening, and the like. However, the effect of phase transformation, whisker and particle toughening is not partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/645
Inventor 毕见强杜明王伟礼隆娜娜白玉俊张政
Owner SHANDONG UNIV
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