Conferences

Tool Ceramics Based on Al2O3 - ZrO2 - TiCN Composite

Ya.G.Dyatlova,
 
S.V.Agafonov,
 
S.Yu.Boikov,
 
S.S.Ordanyan,
 
V.I.Rumyantsev
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #11/12
http://www.materials.kiev.ua/article/1696

Abstract

Oxide composite Al2O3-ZrO2(Y2O3) powders containing 50 and 70 vol.% Al2O3, are deposited from salt solutions. The surface area of the deposited powders exceeds 75 m2/g. The correlation is established between the α-Al2O3 and t-ZrO2(Y2O3) matrix and stepwise crystallization of α-Al2O3 and between powder processing history and sinterability of oxide compositions. Ceramics based on composite Al2O3-ZrO2(Y2O3) powder containing 20 vol.% titanium carbonitride is obtained by hot pressing to be used as a cutting tool. The microstructure and mechanical properties of the ceramics are characterized. The most promising results are demonstrated by ceramic samples hot-pressed at 1550 °С under 35 MPa: bending strength of 950 MPa, fracture toughness of 10.1 MPa • m½, and hardness of 18.0 GPa. The performance and lifetime of the cutting tools based on this ceramics are evaluated according to GOST 26613-85.


COMPOSITE NANOSTRUCTURED MATERIALS, CUTTING TOOL CERAMICS, PHYSICAL-MECHANICAL PROPERTIES, SYSTEM AL2O3–ZRO2, TITANIUM CARBONITRIDE