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Microwave aftertreatment modifying method for polymer precursor-derived ceramics

A technology of precursors and polymers, applied in the field of microwave post-treatment modification of polymer precursors and ceramics, to avoid oxidation, realize volume heating, and promote mass transfer.

Active Publication Date: 2016-08-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a microwave post-treatment modification method for polymer precursor ceramics, so as to solve the shortcomings of existing conventional heating methods in the preparation of polymer precursor ceramics

Method used

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  • Microwave aftertreatment modifying method for polymer precursor-derived ceramics
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Embodiment

[0035] A microwave post-treatment modification method for polymer precursor ceramics in this embodiment includes the following steps:

[0036] 1) in N 2 Under protection, mix polysilazane and thermosetting agent at a mass ratio of 95:5, and stir at 80°C for 1 hour to obtain a mixture; the structure of polysilazane is shown in Formula 1; the thermosetting agent is diisoperoxide Propylbenzene;

[0037] 2) Under vacuum conditions, solidify the mixture obtained in step 1) in a scintillation vial at 140°C for 3 hours to obtain a cured product; after milling the cured product with a high-energy ball mill for 30 min, press it into a circle with a diameter of 20 mm and a thickness of about 2.4 mm piece;

[0038] 3) Under the protection of nitrogen, place the wafer in a tube furnace and pyrolyze it at 1000°C for 4 hours to obtain a precursor ceramic;

[0039] 4) Under the protection of nitrogen, put the precursor ceramics in the heat preservation device, put them into the microwave ...

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Abstract

The invention discloses a microwave aftertreatment modifying method for polymer precursor-derived ceramics. The method comprises the following steps: (1) mixing a polysilazane precursor with a thermosetting agent under nitrogen protection; (2) carrying out thermosetting on the mixture at the temperature of 110 DEG C to 200 DEG C under vacuum conditions; (3) carrying out pyrolysis for 4 hours in a tube type furnace at the temperature of 1,000 DEG C under nitrogen protection; and (4) heating the pyrolysis product to the temperature of 1,000 DEG C by using microwaves under nitrogen protection, carrying out heat preservation for 30 minutes, and carrying out cooling, thereby obtaining modified polymer precursor-derived ceramics. In the prior art, a polymer precursor is modified through conventional heating, a relatively high temperature is usually required, and different degrees of crystallization of a matrix can be caused. The high-temperature thermal stability and electric properties of ceramic materials are greatly dependent on a ceramic amorphous matrix, and the performance of products is always affected by the crystallization of different degrees. Thus, the microwaves are used to carry out rapid low-temperature modification on PDC, and an amorphous state for the matrix is maintained while the performance of the material is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of polymer precursor ceramics, and in particular relates to a microwave post-treatment modification method for polymer precursor ceramics. Background technique [0002] The polymer precursor method is a method for preparing ceramic materials by transforming polymer precursors, and the corresponding ceramic materials can be called polymer precursor ceramics (PDC). The types of polymers that can be used as precursors include polycarbosilane, polysilazane, polysiloxane, polyborazane, and the like. Polymer precursor ceramics (PDC) are a new type of high-temperature ceramics, which are obtained by high-temperature pyrolysis (800-1000°C) silicon-containing polymer precursors, usually composed of Si-C-N(O) tetrahedral amorphous matrix and free carbon. [0003] The typical process of the polymer precursor method includes the crosslinking, inorganicization and crystallization process of the precursor polymer; the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/64
CPCC04B35/589C04B35/64C04B2235/667
Inventor 邵刚彭文峰赵婉瑜王海龙陈德良张锐安立楠范冰冰卢红霞许红亮郭静霞马超彭星淋
Owner ZHENGZHOU UNIV
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