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Preparation method of high-toughness columnar alumina ceramic
The invention relates to a preparation method of a high-toughness columnar alumina ceramic, which is characterized by comprising the following steps: by using high-purity alpha-alumina powder as the main raw material and silicon carbide as an additive, proportioning according to a certain mass ratio, carrying out wet mixing, drying, granulating, forming, and presintering to obtain a semifinished product with the relative density of 72-83%; and naturally cooling to room temperature, acidizing the presintered semifinished product, drying at room temperature, carrying out secondary sintering at 1450-1550 DEG C for 2-6 hours, and naturally cooling to room temperature to obtain the high-toughness columnar alumina ceramic. The length-diameter ratio of the in-situ-growth columnar alumina crystal grain is greater than 5, the bending strength of the formed material is 290-430 MPa, and the fracture toughness is 4.8-7.6 MPa.m<1/2>. Thus, the high-toughness columnar alumina ceramic has excellent mechanical properties and wide application range.
Preparation method of high-toughness columnar alumina ceramic
The invention relates to a preparation method of a high-toughness columnar alumina ceramic, which is characterized by comprising the following steps: by using high-purity alpha-alumina powder as the main raw material and silicon carbide as an additive, proportioning according to a certain mass ratio, carrying out wet mixing, drying, granulating, forming, and presintering to obtain a semifinished product with the relative density of 72-83%; and naturally cooling to room temperature, acidizing the presintered semifinished product, drying at room temperature, carrying out secondary sintering at 1450-1550 DEG C for 2-6 hours, and naturally cooling to room temperature to obtain the high-toughness columnar alumina ceramic. The length-diameter ratio of the in-situ-growth columnar alumina crystal grain is greater than 5, the bending strength of the formed material is 290-430 MPa, and the fracture toughness is 4.8-7.6 MPa.m<1/2>. Thus, the high-toughness columnar alumina ceramic has excellent mechanical properties and wide application range.
Preparation method of high-toughness columnar alumina ceramic
LUO SHULI (author) / WANG JIANTANG (author) / LI QINGFENG (author) / LUO RUTIAN (author) / LUO RUHE (author) / LUO SHENGHUA (author) / LUO SHENGLEI (author)
2015-07-15
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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