Variation of Surface Roughness of Ti3SiC2 Disk during Polishing in Water and Alcohols

2014 ◽  
Vol 602-603 ◽  
pp. 511-514
Author(s):  
Wan Xiu Hai ◽  
Jun Ling Zeng ◽  
Jun Hu Meng ◽  
Jin Jun Lu
Keyword(s):  
Surface Roughness ◽  
Hot Pressing ◽  
Mechanical Polishing ◽  
Polishing Process ◽  
Surface Polishing ◽  
3D Surface ◽  
Diamond Particles ◽  
Abrasive Disk ◽  
Reactive Hot Pressing

The surface polishing of Ti3SiC2 disk in fluids (water, ethanol, propanol, glycol, and glycerol) is conducted on a Buehler grinder/polisher and evaluated using surface roughness. Using Buehler automatic grinder/polisher, the Ti3SiC2 disks are grinded and polished in the as-mentioned lubricants by grinding disk of diamond with sizes of 45 μm to 3 μm. The surface roughnesses of Ti3SiC2 disks at each stage are measured by 3D surface profiler. The results show that the lowest surface roughness (Ra) of Ti3SiC2 disk obtained by mechanical polishing is 0.04 μm. The optimum polishing process of Ti3SiC2 disk is as follows: using water as lubricant, at a load of 5 N, for steps 1 to 4, the Ti3SiC2 and grinding disk rotates comparatively and the sizes of diamond particles on the abrasive disk are 45, 15, 9, and 3 μm, respectively. For step 5, the abrasive disk is woven cloth with no diamond particles. The duration of each step is 5 min. Using the same polishing process, the surface roughness of Ti3SiC2 disk by direct hot pressing is lower than that by in situ reactive hot pressing. Using the same polishing process but different lubricants, the surface roughness of the Ti3SiC2 disks increases in the order of water, ethanol, propanol, glycol, and glycerol. In water, the surface roughness of Ti3SiC2 disk decreases with the increasing quantity of water and polishing duration.

Reactive hot pressing of aluminum matrix composites

1999 ◽  
Vol 14 (11) ◽  
pp. 4246-4250
Author(s):  
H. J. Brinkman ◽  
J. Duszczyk ◽  
L. Katgerman
Keyword(s):  
Hot Pressing ◽  
Adverse Reactions ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Processing Step ◽  
Exothermic Process ◽  
Composite Product ◽  
Reactive Hot Pressing

A method is described for the production of dense aluminum matrix composites from elemental powders in one processing step by reactive hot pressing (RHP). It encompasses both the exothermic conversion of reactants to composite product and the following hot compaction of the porous composite product. The RHP method described in this paper takes into account the gas evolution accompanying the exothermic process, ensures complete conversion of reactants, and avoids adverse reactions between aluminum matrix and graphite tooling material. In situ sample temperature measurements enable proper process control, in particular the timing of the full densification step of the hot reaction product.

Reaction Synthesized Boron Nitride-Containing Composites (BNCC)

2007 ◽  
Vol 280-283 ◽  
pp. 1385-1390
Author(s):  
Guo Jun Zhang ◽  
Tatsuki Ohji ◽  
Shuzo Kanzaki
Keyword(s):  
Boron Nitride ◽  
Hot Pressing ◽  
High Performance ◽  
Hexagonal Boron Nitride ◽  
High Strength ◽  
Reactive Sintering ◽  
Boron Source ◽  
Inorganic Reactions ◽  
Reactive Hot Pressing

Based on the proposed inorganic reactions a series of high performance hexagonal boron nitride-containing composites (BNCC), include SiC-BN, Si3N4-SiC-BN, SiAlON-BN, AlN-BN, Al2O3-BN, AlON-BN and mullite-BN, have been prepared via reactive hot pressing or pressureless reactive sintering. Various boron-bearing components such as B, B4C, AlB2, SiB4, SiB6, B2O3 or H3BO3, 9Al2O3×2B2O3 (9A2B) and 2Al2O3×B2O3 (2AB) are used as the boron source. On the other hand, nitrogen gas or solid state nitirgen-bearing metal nitrides such as Si3N4 and AlN can be used as the nitrogen source. The in situ synthesized composites demonstrated homogeneous and isotropical microstructures with very fine (nano-sized) BN platelets or their agglomerates distributed in the matrixes. These composites showed high strength, low elasticity and improved strain tolerance. In this article the reaction design, thermodynamics, reaction mechanisms, reactive hot pressing or pressureless reactive sintering, microstructures and mechanical properties will be discussed.

Study on Dual-Plane Ball Polishing Method for Finishing Ceramics Ball

2013 ◽  
Vol 797 ◽  
pp. 444-449 ◽  
Author(s):  
Kai Ping Feng ◽  
Zhao Zhong Zhou ◽  
Bing Hai Lv ◽  
Ju Long Yuan
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Mechanical Damage ◽  
Lower Plate ◽  
Mathematics Model ◽  
Polishing Process ◽  
High Quality ◽  
Dual Plane ◽  
Surface Polishing ◽  
Polishing Machine

This paper represents a dual-plane polishing method for ceramics ball. Compared with traditional ball polishing method, its upper and lower plate are all flat and easy to use soft pad to polish, so it can largely reduce the surface mechanical damage and obtain high quality processing surface. This paper analyzes surface polishing trajectory by calculation and simulation to test the polishing trajectory uniformity. A mathematics model of polishing process is established to disintegrate the process of a balls movement. Experiment is operated in dual-plane planetary polishing machine. The result shows that perfect polishing surface and spherical error can be obtained under the proper process parameters, the surface roughness achieves 4nm and the spherical error can reach 0.217μm.

scholarly journals The effect of various Co contents on the microstructure and properties of Ti(C,N)-TiB2-Co cermets prepared in situ via reactive hot pressing

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402092571
Author(s):  
Xianrui Zhao ◽  
Ze Yu ◽  
Dunwen Zuo ◽  
Qintao Li ◽  
Mengxian Zhang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Relative Density ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Hardness Test ◽  
Reactive Hot Pressing ◽  
Compacting Pressure ◽  
Vickers Hardness Test ◽  
Scanning Electron

Ti(C,N)-TiB2-Co cermets were in situ synthesized, via reactive hot pressing from the Co-Ti-C-BN system, with a Co content ranging from 6 to 22 wt%. The microstructure, relative density, hardness, and fracture toughness of the sintered compacts was investigated by light microscopy, scanning electron microscopy, ceramic densitometry, and Vickers hardness test. The investigations indicate that during hot pressing (compacting pressure = 30 MPa), when the Co content is 14–22 wt%, the metal binder is extruded. Co and Ti are included in the extrudate, breaking the original ratio and deteriorating the properties of the sintered products. As the Co content increases from 6 wt% to 12 wt%, the porosity increases, and the relative density increases from 97.2% to 99.5%. The fracture toughness increases from 6.1 to 6.8 MPa m1/2. The Vickers hardness first increases from 1897 HV10 to the maximum 1960 HV10 and then decreases slightly to 1945 HV10.

A study on in-situ synthesis of TiB2–SiC ceramic composites by reactive hot pressing

2014 ◽  
Vol 40 (1) ◽  
pp. 2305-2313 ◽  
Author(s):  
Guolong Zhao ◽  
Chuanzhen Huang ◽  
Hanlian Liu ◽  
Bin Zou ◽  
Hongtao Zhu ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Ceramic Composites ◽  
In Situ Synthesis ◽  
Sic Ceramic ◽  
Reactive Hot Pressing

Microstructure of In Situ Tic-Mo-Ni And Tic-WC-Mo-Ni Cermets Synthesized by Reactive Hot-Pressing Sintering

2011 ◽  
Vol 194-196 ◽  
pp. 1785-1788 ◽  
Author(s):  
Zong De Liu ◽  
Li Ping Zhao ◽  
Yan Rong Bao ◽  
Bin Li
Keyword(s):  
Chemical Reactions ◽  
Hot Pressing ◽  
Phase Structure ◽  
Size Range ◽  
Phase Changes ◽  
Binder Phase ◽  
Hot Pressing Sintering ◽  
Reactive Hot Pressing ◽  
Structure And Microstructure

TiC-Mo-Ni and TiC-WC-Mo-Ni cermet blocks have been obtained in situ by reactive hot pressing sintering. The phase structure and microstructure of the two cermets were compared to investigate the effect of the addition of WC. The results show that the chemical reactions between Ti, Mo and C in TiC-Mo-Ni system are relatively complete. However, there is a small amount of unreacted C powder in TiC-WC-Mo-Ni system, which is associated with the reaction between Ti and WC. The in-situ carbide grains are very fine with the size range of 0.5-2µm. The boundary morphology between the carbide grains and the binder phase changes from an angular shape to an almost rounded shape with the addition of WC.

Environment-Friendly Chemical Mechanical Polishing Slurry for SiC Wafer

2016 ◽  
Vol 874 ◽  
pp. 415-419
Author(s):  
Ze Wei Yuan ◽  
Yan He ◽  
Quan Wen ◽  
Hai Yang Du
Keyword(s):  
Surface Roughness ◽  
Reaction Mechanism ◽  
Environmental Pollution ◽  
Chemical Mechanical Polishing ◽  
Mechanical Polishing ◽  
Polishing Process ◽  
Environment Friendly ◽  
High Efficient ◽  
Sic Wafer

In order to avoid the environmental pollution and the harm to body of traditional polishing slurries, an environment-friendly chemical mechanical polishing technology is proposed for SiC wafer in this study. With this method, SiC material is removed by utilizing the strong oxidability of nanotitanium dioxide particles in chemical mechanical slurry in the existence of ultraviolet. While, the oxidbillity will recede in absence of ultraviolet when the polishing process finishes. On the basis of investigating in the reaction mechanism between SiC and nanotitanium dioxide, the slurries are prepared for the environment-friendly chemical mechanical polishing technology. The results show that the ultraviolet-assisted CMP slurry has strong oxidation for SiC material. This method is high-efficient for polishing SiC wafer. The surface roughness is reduced to about Ra 0.1μm from Ra 0.818μm after polishing for one hour.

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