Silicon carbide water-base casting slurry containing alpha-silicon nitride whisker and preparation method thereof

A technology of silicon nitride water-based and silicon nitride whiskers, which is applied in the field of silicon nitride water-based casting slurry and its preparation, can solve the problems of lack of research materials and data, and achieve simple preparation process and machinability Good, short cycle effect

Inactive Publication Date: 2008-04-23
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Judging from the current domestic and foreign literature, there are very few research materials and data on water-based casting slurries mixed with whiskers, especially the preparation of water-based slurries added with α-silicon nitride whiskers is still blank in China

Method used

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  • Silicon carbide water-base casting slurry containing alpha-silicon nitride whisker and preparation method thereof
  • Silicon carbide water-base casting slurry containing alpha-silicon nitride whisker and preparation method thereof

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preparation example Construction

[0020] The preparation process of the slurry of the present invention is shown in Figure 1, including batching, mixing, two ball milling and post-treatment procedures.

[0021] (1) Weigh 1-10% silicon nitride whiskers and 16-25% silicon nitride powder by mass percentage, 1-8% polyethyleneimine as dispersant, and deionized water balance as solvent, Use tetramethylammonium chloride to adjust the pH value of the slurry to 9-11 to ensure that the slurry has a high absolute value of Zeta potential, give full play to the electrostatic repulsion between particles, and obtain Si after ball milling on a ball mill for 6-48 hours 3 N 4 Suspension, balls and tanks used for ball milling are silicon nitride balls and nylon ball milling tanks respectively. The used α-silicon nitride whiskers have an aspect ratio of 10-200 and a diameter of 0.1-0.35 μm; the particle size of the silicon nitride powder is less than 0.5 μm.

[0022] (2) Add 20-35% of polyvinyl alcohol solution as binder and 1-...

Embodiment 1

[0025] Example 1: The solid phase content in the design slurry is 26%, the content of α-silicon nitride whiskers is 3.0%, the content of silicon nitride powder is 25%, and the content of polyethyleneimine is 4%. The content of polyvinyl alcohol is 20%, the content of propylene glycol is 4.1%, adjust pH value with tetramethylammonium chloride to be 9, deionized water surplus, prepare slurry according to the technological process of Fig. 1, rheology as Fig. 2 shown. The micromorphology of the cast film surface obtained after casting is shown in Fig. 5 . The surface of the casting film is smooth, and the powder particles and pores are evenly distributed.

Embodiment 2

[0026] Embodiment 2: The solid content in the design slurry is 26%, the content of α-silicon nitride whiskers is 3.0%, the content of silicon nitride powder is 23%, and the content of polyethyleneimine is 4%. The content of polyvinyl alcohol is 25%, the content of propylene glycol is 3.8%, and the pH value is adjusted to 9 with tetramethylammonium chloride, and the deionized water balance is used to prepare the slurry according to the technological process in Fig. 1, and the rheological properties are as shown in Fig. 2.

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Abstract

The present invention is one kind of water-based flow casting slurry of silicon nitride containing alpha-silicon nitride crystal whisker in the solid content of 15-40 wt%. The slurry consists of alpha-silicon nitride crystal whisker 1-10 wt%, silicon nitride powder 16-25 wt%, polyethylene imine 1-8 wt%, PVA 20-35 wt%, propylene glycol 1-8 wt%, and deionized water for the rest. It is prepared through preparing the materials including alpha-silicon nitride crystal whisker, deionized water as solvent, polyethylene imine as dispersant, PVA as adhesive, propylene glycol as plasticizer and ammonium tetramethyl chloride to regulate pH value; mixing; twice ball milling and post-treatment. It has relatively high crystal whisker content, low viscosity and high dispersivity, and is suitable for flow casting to form cast film with flat surface, homogeneously dispersed powder grains and pores, high strength and high machinability.

Description

technical field [0001] The invention relates to a water-based casting slurry and a preparation method thereof, in particular to a silicon nitride water-based casting slurry containing α-silicon nitride whiskers and a preparation method thereof. Background technique [0002] Silicon nitride is an inorganic non-metallic compound with strong covalent bonds. Because the nitrogen atoms are very firmly bonded, it has the advantages of high specific strength, high specific modulus, high temperature resistance, oxidation resistance and wear resistance, and high thermal shock resistance. Therefore, it has special use value in the working environment of high temperature and high strength corrosive medium. Although the silicon nitride structural ceramic material has many excellent properties above, and has a wide range of important applications in various fields, its fatal weakness: brittleness, will still hinder its wider application. It is not as strong as metals. The ability of pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/81C04B35/63
Inventor 张联盟李君陈斐刘晶张东明沈强王传彬
Owner WUHAN UNIV OF TECH
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