Silicon nitride non-aqueous tape-casting slurry and its preparation method

A silicon nitride non-aqueous-based, casting slurry technology, applied in the field of nitride-based non-aqueous-based casting slurry and its preparation, can solve the problems of lack of research materials and data for non-aqueous-based casting slurry, etc. Achieve the effects of good machinability, simple preparation process and high strength

Inactive Publication Date: 2007-05-16
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 non-water-based tape casting slurries mixed with whiskers, especially the preparation of α-silicon nitride whiskers is still blank in China.

Method used

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  • Silicon nitride non-aqueous tape-casting slurry and its preparation method
  • Silicon nitride non-aqueous tape-casting slurry and its preparation method
  • Silicon nitride non-aqueous tape-casting slurry and its preparation method

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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 to 6% silicon nitride whiskers and 18 to 25% silicon nitride powder by mass percentage, add absolute ethanol and methyl ethyl ketone as an organic solvent in a ratio of 3:1 to 1:1, Triethyl phosphate is used as a dispersant, the dispersant content is 0.8-6%, and NH 3 ·H 2 O adjust the pH value of the slurry to 9-11 to ensure that the slurry has a high absolute value of Zeta potential, fully exert 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 aspect ratio of the α-silicon nitride whiskers is 10-200, and the particle size of the silicon nitride powder is about 0.5 μm.

[0022] (2) Add 1 to 8% of poly...

Embodiment 1

[0025] Embodiment 1: The solid content in the design slurry is 35%, the content of α-silicon nitride whiskers is 4.6%, the content of silicon nitride powder is 25%, and the content of dispersant triethyl phosphate is 2.6% %, the content of the binder polyvinyl butyral is 4.2%, the total content of the plasticizer is 4.1%, and the pH value is 9. The slurry is prepared according to the technological process in Figure 1, and the rheology is shown in Figure 2. 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 33%, the content of α-silicon nitride whiskers is 5.3%, the content of silicon nitride powder is 23%, and the content of dispersant triethyl phosphate is 1.9% %, the content of the binder polyvinyl butyral is 4.7%, the total content of the plasticizer is 3.8%, the pH value is 11, and the slurry is prepared according to the technological process in Figure 1, and the rheological properties are shown in Figure 3 .

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Abstract

The invention discloses non-water-based doctor-blade slurry of silicon nitride and preparing method, which comprises the following parts: 1-6% alpha-silicon nitride whisker, 18-25% silicon nitride powder, 0.8-6% triethyl phosphate, 1-8% polyvinyl butyral, 1-5% plasticizer and 50-75% solvent, the plasticizer consists of carbowax and glycerin; the solvent concludes anhydrous alcohol and methyl ethyl ketone. The preparing method of slurry comprises the following steps: adding alpha-silicon nitride whisker; adopting anhydrous alcohol and methyl ethyl ketone as solvent; making triethyl phosphate as dispersant; adopting polyvinyl butyral as adhesive; making carbowax and glycerin as plasticizer; setting solid phase content as datum; allocating; blending; balling twice; proceeding after-disposal.

Description

technical field [0001] The invention relates to a non-water-based casting slurry and a preparation method thereof, in particular to a nitrogen-based non-water-based casting slurry 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 plastic deformation has a dislocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/632
Inventor 张联盟陈斐李君张东明沈强王传彬
Owner WUHAN UNIV OF TECH
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