Cellulose nanocrystalline-modified ceramic blank and preparation method thereof

Abstract

The invention discloses a cellulose nanocrystalline-modified ceramic blank and a preparation method thereof. Cellulose nanocrystals are added into a ceramic blank in gelcasting. The cellulose nanocrystalline-modified ceramic blank comprises, by weight, 0.1 to 10 parts of cellulose nanocrystals, 0.1 to 30 parts of organic gel and 70 to 99 parts of ceramic powder. The cellulose nanocrystal has length of 100 to 300nm, a diameter of 10 to 20nm, a slenderness ratio of 10 to 15 and an elastic modulus of 100 to 150 GPa. The drying strength of the ceramic blank with the cellulose nanocrystals is obviously improved. Because the cellulose nanocrystal structure contains a large amount of hydroxyl groups, the cellulose nanocrystal has strong hydrophilicity so that the water retention of the blank is enhanced. After drying for 1 to 3 hours, the toughness of the gel blank is obviously improved and the gel blank has certain bending strength so that the difficult problem that the gel blank easily adheres to a mold in a punching process is solved. The preparation method can directly shape the gel blank and greatly simplifies the industrial production process.

Description

technical field

[0001] The invention relates to the field of preparation of inorganic non-metallic materials, in particular to a high-performance ceramic green body and a preparation method thereof. Background technique

[0002] Ceramic materials have high hardness and brittleness, and are difficult to process later, so there are few molding methods for ceramic blanks. For special ceramics with complex shapes and precise dimensions, the molding methods become complicated and difficult. Operation greatly affects the quality and productivity of ceramic products. Injection molding technology is a near net size precision molding technology (U.S.Patent: 4894194; U.S.Patent: 5028362) invented by Oak Ridge National Laboratory in the early 1990s, which combines polymer chemistry theory with ceramic grouting Combining molding methods, organic monomers are polymerized under the conditions of initiators and catalysts to form a three-dimensional network structure, so that ceramic slurr...