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Preparation method of functionalized fused quartz powder for preparing quartz ceramics and functionalized fused quartz powder

A technology for fused silica powder and quartz ceramics, which is applied in the field of functionalized fused silica powder, can solve the problems of being difficult to remove, difficult to adapt to large-scale production requirements, etc., and achieves the effects of increased density, energy-saving and high-efficiency raw materials, and simple and stable operation.

Active Publication Date: 2017-07-07
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention patent with the authorized notification number CN103342547 B discloses a method for preparing high-density fused silica ceramics. First, hydrochloric acid is used as a catalyst for the hydrolysis of ethyl orthosilicate to produce silica sol, and then super-dispersed fused silica powder is added. Stir to achieve uniform coating of homogeneous sol on the surface. The coated fused silica ceramic powder is pressed and sintered to obtain fused silica ceramics with increased density. However, the catalyst hydrochloric acid used in the coating process will introduce trace impurities that are difficult to remove Chlorine, and the uniform coating of the powder by the sol through stirring has certain limitations, and it is difficult to adapt to the requirements of industrialized large-scale production

Method used

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  • Preparation method of functionalized fused quartz powder for preparing quartz ceramics and functionalized fused quartz powder
  • Preparation method of functionalized fused quartz powder for preparing quartz ceramics and functionalized fused quartz powder
  • Preparation method of functionalized fused quartz powder for preparing quartz ceramics and functionalized fused quartz powder

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Embodiment 1

[0048] The preparation method of the functionalized fused silica powder that is used for quartz ceramics preparation comprises the following steps:

[0049] S1. use a ball mill to grind the fused silica into powder, and get the powder that can pass through a 200-mesh sieve for subsequent use;

[0050] S2. Dissolve 342g of sucrose in 200mL of deionized water, then slowly add 180g of the fused silica powder obtained in step S1 into the sucrose solution while stirring, mix well, place in a drying oven, dry at 80°C for 36h, and cool , into the crucible;

[0051] S3. Place the crucible in a high-temperature atmosphere furnace, and under the protection of nitrogen, heat it to 700°C at a heating rate of 10°C / min, and then keep it warm for 1 hour to thermally decompose sucrose, and cool the obtained powder for later use;

[0052] S4. Place the fused silica powder obtained in S3 in a microwave reaction furnace, first vacuumize, and then pass nitrogen gas at a rate of 5L / min. After a p...

Embodiment 2

[0055] Use a ball mill to grind the fused silica into powder, take the powder that can pass through a 200-mesh sieve for later use, dissolve 342g of sucrose in 200mL of deionized water, and then slowly add 180g of fused silica powder to the sucrose solution while stirring, other conditions and implementation The same as Example 1, the difference is that the carbothermal reduction is heated to 900°C at a heating rate of 10°C / min to carry out the carbothermal reduction reaction.

Embodiment 3

[0057] Use a ball mill to grind the fused silica into powder, take the powder that can pass through a 200-mesh sieve for later use, dissolve 342g of sucrose in 200mL of deionized water, and then slowly add 180g of fused silica powder to the sucrose solution while stirring, other conditions and implementation The same as Example 1, the difference is that the carbothermal reduction is heated to 950°C at a heating rate of 10°C / min to carry out the carbothermal reduction reaction.

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Abstract

The invention discloses a preparation method of functionalized fused quartz powder for preparing quartz ceramics and the functionalized fused quartz powder. According to the preparation method of the functionalized fused quartz powder for preparing the quartz ceramics, products obtained after thermal decomposition of sucrose are used as carbon sources, in the atmosphere of nitrogen, through carbothermal nitridation reduction reaction, a sintering additive is formed through in-situ synthesis on the surface of fused quartz powder, the obtained functionalized fused quartz powder is used for the preparation and shaping of fused ceramics, and compared with mechanical addition of the sintering additive, the obtained functionalized fused quartz powder can be distributed more evenly in a matrix; meanwhile, because a trace amount of oxygen in the fused powder can be consumed in the process of functionalized treatment, and a crystallization phenomenon is inhibited to a certain degree; the volume density of the obtained fused quartz ceramics prepared from the obtained functionalized fused quartz powder is 1.96 g / cm<3>, and the fracture resistance reaches 43.5 MPa. The preparation method is simple and stable to operate, low in energy consumption and economical and environmentally friendly, and the used raw materials are cheap and easy to get, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of quartz ceramics preparation, and more specifically, relates to a preparation method of functionalized fused silica powder used in the preparation of quartz ceramics and the functionalized fused silica powder. Background technique [0002] Quartz ceramics have the advantages of poor thermal conductivity, small expansion coefficient, high temperature resistance, good thermal stability, and low cost. They have been widely used in metallurgy, building materials, chemical industry, national defense, scientific research and other fields. There are two types of quartz ceramics: one is prepared from crystalline quartz (quartz sand or crystal) at 1600 °C, and the other is fused silica ceramics prepared at 1200 °C from pulverized fused silica. [0003] Compared with other structural ceramics, fused silica ceramics have the defects of low volume density and poor mechanical properties. This is due to the lack of orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/626
CPCC04B35/14C04B35/6261C04B35/6265C04B2235/3873C04B2235/77
Inventor 侯清麟侯熠徽田靓贺思慧张浩益
Owner HUNAN UNIV OF TECH
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