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Wear Characteristics of Zirconia Toughened Ceramic Drawing Dies
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作者 Zhigang CHEN (Ceramic Research Lab., Jiangsu University of Science and Technology, 212013, Zhenjiang, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第5期380-384,共5页
Wear resistance of several zirconia toughened ceramics in comparison with a metal-ceramic Co-WC has been studied in drawing wire field test. Result indicates that the harder the ceramic die, the longer the service lif... Wear resistance of several zirconia toughened ceramics in comparison with a metal-ceramic Co-WC has been studied in drawing wire field test. Result indicates that the harder the ceramic die, the longer the service life. Excellent wear resistance of ceramic die is obtained with a very high hardness (19 GPa). The service life is nearly three times that of Co-WC die. SEM observation on wear surfaces showed that material removal is mainly caused by plastic flow and ploughing process. But when the ceramic is composed of zirconia, alumina and some titanium carbide, micro-chipping and tribochemical reaction take place, and wear rate increases. Wear and friction induced martensite was detected by XRD. The T-M (tetragonal to monoclinic) phase transformation has a contribution to inhibiting microfracture. 展开更多
关键词 WC Wear Characteristics of Zirconia toughened ceramic Drawing Dies
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A NEW METHOD TO DETERMINE THE R-CURVE OF CERAMICS-FRACTURE GRATING METHOD
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作者 Shi, L Dai, FL Jiang, XL 《Acta Mechanica Solida Sinica》 SCIE EI 1996年第1期81-87,共7页
The etching technique of the single-lined zero-thickness specimen grating is applied to the surface of the SiC fiber toughening Si3N4 ceramic composite specimen. The position of the crack and the crack length during t... The etching technique of the single-lined zero-thickness specimen grating is applied to the surface of the SiC fiber toughening Si3N4 ceramic composite specimen. The position of the crack and the crack length during the process of crack extension when the load is applied and gradually increased can be determined by recording the output voltage value of the Wheatstone bridge in which the ceramic specimen with the fracture grating on is located. The crack-growth-resistance(R-curve) of this material is thus obtained. 展开更多
关键词 fiber toughening ceramic composite zero thickness specimen grating ETCHING crack extension R-CURVE
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ASYMPTOTIC ANALYSIS OF PLANE-STRAIN MODE I STEADY-STATE CRACK GROWTH IN TRANSFORMATION TOUGHENINGCERAMICS(Ⅱ)
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作者 张浠 叶裕恭 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1997年第7期689-696,共8页
Based on a constitutive law which includes the shear components oftransformation plasticity. the asymptotic solutions to near-tip fields of plane-strainmode I steadity propagating cracks in rransformed ceramics are o... Based on a constitutive law which includes the shear components oftransformation plasticity. the asymptotic solutions to near-tip fields of plane-strainmode I steadity propagating cracks in rransformed ceramics are obtained for the caseof linear isotropic hardening. The Stress singularity. the distributions of stresses andvelocities at the crack tip are determmed for various material parameters. The factorsinfluencing the near-tip fields are discussed in detail. 展开更多
关键词 transformation toughening ceramics shear effect crack growth asymptotic method
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Effect of Interfacial Bonding on the Toughening of Al_2O_3/Ni Ceramic Matrix Composites
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作者 Xudong SUN(Dept. of Materials Science and Engineering, Northeastern University, Shenyang 110006, China)J.A. Yeomans(Dept. of Materials Science and Engineering, University of Surrey, Guildford, Surrey GU2 5XH, UK) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1996年第1期29-34,共6页
The main Iimitation to the toughening of the α-Al2O3/Ni composite is the poor bonding atthe interface. which causes the nickel particles to be pulled-out during crack propagation with-out obvious plastic deformation.... The main Iimitation to the toughening of the α-Al2O3/Ni composite is the poor bonding atthe interface. which causes the nickel particles to be pulled-out during crack propagation with-out obvious plastic deformation. A proper control of oxygen content at the Al2O3-Ni interfacecan promote wetting at the intedece, and produce a mechanically interlocked and chemically strengthened intedece, causing most of the nickel particles to be stretched to failure and to expe-rience severe plastic deformation during crack propagation in the composite. Fracture toughnesstesting using a modified double cantilever beam method with in situ observation of crack prop-agation in a scanning electron microscope shows that the composite with the strengthenedinterface has a more desirable R-curve behaviour and a higher fracture toughness value than thenormal composite. 展开更多
关键词 AL Effect of Interfacial Bonding on the Toughening of Al2O3/Ni ceramic Matrix Composites NI
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