Abstract
The Al2O3/Ti(C,N) ceramic material added micron ZrO2 whisker and nano coated CaF2@Al(OH)3 powder was fabricated. The micron ZrO2 whisker was for the toughening and reinforcing phase and the nano coated CaF2@Al(OH)3 powder was the lubricant. For obtaining a ceramic material with optimal comprehensive mechanical properties and friction properties, the influences of different compositions of the ZrO2 whisker and nano coated CaF2@Al(OH)3 powder on the microstructure and mechanical properties were analyzed, respectively. The result demonstrated that as the addition of the ZrO2 whisker was 6 vol% and the addition of the nano coated CaF2@Al(OH)3 powder was 10 vol%, the optimal self-lubricating ceramic material had optimal mechanical properties. The hardness of the ceramic material was 16.72 GPa, the flexural strength was 520 MPa and the fracture toughness reached 7.16 MPa·m1/2. The formation of the intragranular structure, whisker toughening and the phase transition of ZrO2 were the main mechanisms.
Highlights
The ceramic materials can be generally used in various fields because of excellent chemical and physical properties [1,2,3]
The ZrO2 whisker with 0, 3 vol%, 6 vol% and 9 vol% were added to the Al2 O3 /Ti(C,N) ceramic material
The result revealed that when the additive amount of the ZrO2 whisker was 6 vol%, the hardness, the flexural strength and the fracture toughness values were 19.1 GPa, 584 MPa and 6.61 MPa·m1/2, respectively
Summary
The ceramic materials can be generally used in various fields because of excellent chemical and physical properties [1,2,3]. Aluminum oxide is an ideal material due to its inherent high hardness and excellent thermal stability [4,5,6]. Aluminum oxide-based ceramic materials are broadly used in cutting tool molds, sealing rings and various high temperature engine parts [7,8,9]. The self-lubricating ceramic tool materials with excellent mechanical properties and friction properties have always been people’s pursuit goal. To acquire the ceramic material with excellent mechanical properties, many scholars have studied gradient design and layered design [13,14,15]. Yang [16] prepared the gradient composite
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