Lapping of composite of Y-TZP and Ce-TZP
01 Jan 1994-Journal of Materials Science Letters (Kluwer Academic Publishers)-Vol. 13, Iss: 3, pp 187-189
About: This article is published in Journal of Materials Science Letters.The article was published on 1994-01-01. It has received 3 citations till now. The article focuses on the topics: Lapping & Composite number.
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01 Jan 1998
TL;DR: In this article, the authors propose a 3.3-approximation algorithm for the 3.1-GHz bandit-16.3 GHz frequency bandit model, and
Abstract: 3
123 citations
TL;DR: In this paper, the development of Ce-transformation toughened zirconia (TTZ) based alumina ceramic-ceramic composite (ZTA) for machining applications has resulted in a cutting tool which can be used in a finishing operation even at relatively low cutting speeds, which is usually the range for carbide cutting tools.
Abstract: Zirconia toughened aluminas (ZTAs) with their enhanced transverse rupture strength and fracture toughness are more widely applicable and more productive than plain alumina ceramics and cermets in metal cutting applications. The development of Ce-transformation toughened zirconia (TTZ) based alumina ceramic-ceramic composite (ZTA) for machining applications has resulted in a cutting tool which can be used in a finishing operation even at relatively low cutting speeds, which is usually the range for carbide cutting tools.
20 citations
19 May 2019
TL;DR: In this paper, the surface roughness in relation to different characteristics of ceramic material was investigated using the 3D MahrSurf XR 20 profilometer and the InfiniteFocus Real3D microscope, in order to determine the influence of the selected machining strategy on the machined surfaces.
Abstract: The article concerns an investigation of surface roughness in relation to different characteristics of ceramic material. Three different levels of temperature (1320 °C, 1490 °C and 1620 °C) have been used to sinter the ceramic in the preparation of samples. The machining has been performed using a computer numerical control (CNC) milling machine, together with a face grinding wheel, specific face grinding strategy, and special work holding arrangement. The surface roughness is assessed using three parameters (Ra, Rz, Rsm). The contact measurements of surface roughness were carried out using the 3D MahrSurf XR 20 profilometer. The surfaces of machined samples were also analyzed using the InfiniteFocus Real3D microscope, in order to determine the influence of the selected machining strategy on the machined surfaces. The values of the selected roughness parameters were recorded depending on the material and its degree of sintering. The selected machining strategy, for all the analyzed ceramic samples (i.e. in relation to states of sintering), allowed Ra parameter values below 0.43 μm, Rz below 3.5 μm and Rsm below 50 μm, respectively, to be obtained.
References
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TL;DR: In this paper, the characteristic features of hard and brittle materials are outlined, and a fundamental principle for grinding those materials is discussed, followed by practical examples of advanced ceramics grinding.
252 citations
Book•
01 Jan 1991
TL;DR: The Concise Encyclopedia of Advanced Ceramic Materials as discussed by the authors provides a comprehensive selection of accessible articles which act as an authoritative guide to the subject of advanced ceramics, including a wide range of materials which are ceramic by nature but have been developed in response to specific requirements.
Abstract: Hardbound. Advanced ceramics cover a wide range of materials which are ceramic by nature but have been developed in response to specific requirements. This encyclopedia collects together 137 articles in order to provide an up-to-date account of the advanced ceramic field. Some articles are drawn from the acclaimed Encyclopedia of Materials Science and Engineering, often revised, and others have been newly commissioned. The Concise Encyclopedia of Advanced Ceramic Materials aims to provide a comprehensive selection of accessible articles which act as an authoritative guide to the subject. The format is designed to help the readers form opinions on a particular subject. Arranged alphabetically, with a broad subject range, the articles are diverse in character and style, thereby stimulating further discussion. Topics covered include survey articles on glass, hot pressing, insulators, powders, and many are concerned with specific chemical sy
182 citations
TL;DR: In this paper, the grinding-induced transformation in single-phase Ce-TZP materials, referred to in an earlier paper, was observed. But the results showed that the transformation was limited on the hand-ground surface, while the reversal in tetragonal (200) peak symmetry and intensity remained unaltered up to at least 1000°C.
Abstract: Observations of the grinding-induced transformation in singlephase Ce-TZP materials, referred to in an earlier paper, are presented. Two techniques were used to grind the surface: by hand in a slurry of abrasive particles and with a high-speed diamond-impregnated wheel. Significant differences in X-ray diffraction profiles between the two grinding methods was observed. Limited monoclinic ZrO2 was detected on the machineground surface, along with the reversal of the tetragonal ZrO2 (200) peak intensities. On the hand-ground surface, considerable monoclinic phase was observed. The disappearance of the monoclinic phase with heating was followed by X-ray diffraction, and the Af was found to exceed 700°C, while the reversal in tetragonal (200) peak symmetry and intensity remained unaltered up to at least 1000°C. Transmission electron microscope studies at various depths below the ground surface were undertaken to identify the differences between these surfaces and fractured surfaces. A simple explanation is proposed for the reversal of the tetragonal peak intensities. This reversal has previously led to the notion of a ferroelastic toughening mechanism in similar TZP materials.
135 citations
TL;DR: CeO2-stabilized tetragonal zirconia polycrystal (Ce-TZP) containing 1 to 6 mol % YO15 have been fabricated as fine powders by a coprecipitation technique as mentioned in this paper.
Abstract: CeO2-stabilized tetragonal zirconia polycrystal (Ce-TZP) containing 1 to 6 mol % YO15 have been fabricated as fine powders by a coprecipitation technique The microstructure of the as-sintered surface and fracture surface were examined by electron microscopy CeO2 dopants reduced the phase transformation temperature from amorphous to tetragonal and stabilized the tetragonal phase at low temperature The addition of Y2O3 to Ce-TZP inhibited the grain growth The sintered density reached 99% theoretical for short sintering times at 1440 and 1540° C, but decreased slightly to 97 to 98% theoretical for longer sintering times The decrease in density is attributed to the morphological development of agglomerates, which induce large pores during sintering The average grain size decreased significantly as the yttrium content increased from 1 to 3 mol % Specimens aged in water at low temperatures exhibited no phase transformation This implies fairly good thermal stability in the Y2O3-doped Ce-TZP system
45 citations
TL;DR: In this article, the fabrication and applications of advanced ceramics are discussed, and the pattern of development of these materials has been characterized by a steadily increasing awareness of each of the linking factors between processing and microstructure.
Abstract: Publisher Summary This chapter discusses the fabrication and applications of advanced ceramic materials. Ceramics make up one part of the portfolio of materials available for use and development in civilization and are in this respect complementary to the metals and polymers. Mechanical applications at ambient temperature are largely based on the combination of wear resistance, hardness, and corrosion resistance that many ceramics provide. Alongside the many advantages that ceramics bring to these uses, the principal disadvantage and impediment to more rapid exploitation has been that, while the materials can display great strength, the mode of fracture is most commonly brittle resulting in sudden and complete failure of the component. In the most idealized form, solid-state sintering, the powder consists of individual crystal grains that remain solid throughout the heat treatment. The system is heated to temperatures where diffusion of the atoms in the solid state can occur. The pattern of development of advanced ceramics has been characterized by a steadily increasing awareness of each of the linking factors between processing and microstructure and between microstructure and properties.
30 citations