Processing of alumina ceramics by abrasive waterjet- an experimental study

Saurabh, Saket; Tiwari, Tanmay; Nag, Akash; Dixit, A. B.; Mandal, Niladri; Das, Alok Kumar; Mandal, Amitava; Srivastava, Ashish Kumar

doi:10.1016/j.matpr.2018.06.140

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…The cutting process was carried out using a JetMachining ® Center type 55100 cutting machine produced by OMAX (Kent, WA, USA). This precision AWJ system, whose general view is presented in Figure 4 , is widely used in many modern applications, as presented by Zhao and Guo [ 41 ], Linke et al [ 42 ], and Saurabh et al [ 43 ].…”

Section: Methodology Of Experimental Studiesmentioning

confidence: 99%

Influence of Variable Radius of Cutting Head Trajectory on Quality of Cutting Kerf in the Abrasive Water Jet Process for Soda–Lime Glass

et al. 2020

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The main innovation of this article is the determination of the impact of curvature of a shape cut out in a brittle material using an abrasive water jet (AWJ) process as an important factor of the machined surfaces. The curvature of a shape, resulting from the size of the radius of the cutting head trajectory, is one of the key requirements necessary for ensuring the required surface quality of materials shaped by the abrasive water jet process, but very few studies have been carried out in this regard. An important goal of the experimental studies carried out here and presented in this work was to determine its influence on the quality of the inner and outer surfaces of the cutting kerf. This goal was accomplished by cutting the shape of a spiral in soda–lime glass. For such a shape, the effect of radius of the trajectory of the cutting head on selected parameters of the surface texture of the inner surface of the cutting kerf (IS) and the outer surface of the cutting kerf (OS) was studied. The obtained results of the experimental studies confirmed that the effect of the curvature of the cut shape is important from the point of view of the efficiency of the glass-based brittle material-cutting process using AWJ. Analyses of the surface textures of the areas located in the upper part of the inner and outer surfaces separated by the use of AWJ machining showed that the OS surfaces are characterized by worse technological quality compared with IS surfaces. Differences in the total height of surface irregularities (given by St amplitude parameter), determined on the basis of the obtained results of the measurements of both surfaces of the cutting kerf, were as follows: ΔStr = 50 = 0.6 μm; ΔStr = 35 = 1 μm; ΔStr = 15 = 1.3 μm. The analysis of values measured in areas located in the more sensitive zone of influence of the AWJ outflow proved that the total height of irregularities (St) of the OS was higher. Differences in the total heights of irregularities for inner and outer surfaces of the cutting kerf were as follows: ΔStr = 50 = 2.1 μm; ΔStr = 35 = 3 μm; ΔStr = 15 = 14.1 μm, respectively. The maximum difference in the total heights of irregularities (St), existing between the surfaces considered in a special case (radius 15 mm), was almost 20%, which should be a sufficient condition for planning cutting operations, so as to ensure the workpiece is shaped mainly by internal surfaces.

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Section: Methodology Of Experimental Studiesmentioning

confidence: 99%

Influence of Variable Radius of Cutting Head Trajectory on Quality of Cutting Kerf in the Abrasive Water Jet Process for Soda–Lime Glass

et al. 2020

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“…The in-situ C f /Al 2 O 3 was fabricated using uni-axial hot-pressed sintering in a vacuum. Raw materials included a 77 j% a-Al 2 O 3 powder (the average grain size of 5.2 μm), 20 j% PAN fibers (a density of 1.4 g/cm 3 and a length of 3-5 mm) and a 3 j% CaO-MgO-SiO 2 fluxing agent. All of the raw materials were uniformly mixed, and then the mixture was placed into a graphite mold to be treated with hot-pressed sintering in a vacuum chamber at 1550°C.…”

Section: Methodsmentioning

confidence: 99%

“…1,2 The behavior of waterjet-machined ceramics has been reported by numerous research works. 3,4 But only a few research studies focus on the machinability of ceramic-matrix composites machined by waterjet. 5 E. Savrun et al 6 reported on the feasibility of finishing a SiC whisker/Al 2 O 3 composite with an abrasive waterjet.…”

Section: Introductionmentioning

confidence: 99%

Piercing behavior of an in-situ Cf/Al2O3 composite in waterjet machining

Ren¹,

Qiao²

2019

Mater. Tehnol.

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Short fiber/ceramic composites with a relatively low price and facile preparation procedure have been widely used, and waterjet is commonly used to machine hard materials because of its high efficiency. However, there is a limited number of works on the waterjet-machining behavior of ceramic incorporated with short fibers. In this study, an in-situ Cf/Al2O3 composite was prepared by in-situ transforming pre-oxidized poly-acrylonitrile fibers into carbon fibers during uni-axial hot-pressed sintering of an alumina matrix. Under the uni-axial pressure, the fibers were preferably orientated parallel to the hot-pressed surface. Pristine Al2O3 ceramic was selected to be compared with the composite. Experimental results demonstrated that the machined surface with most of its fibers being parallel to it exhibited a satisfactory machining behavior. In this situation, the average piercing depth of the composite was approximately 1.5 and 5-7 times higher than that of the Al2O3 ceramic machined with pure waterjet and abrasive waterjet, respectively. Erosion mechanisms associated with the pure-waterjet piercing of the composite were alumina-matrix intergranular or transgranular fractures and fiber spalling or fracture. For the abrasive waterjet, micro-fracture of the alumina grains and fibers together with a grain plastic deformation and abrasive micro-melting were discovered to be the dominant erosion mechanisms. It was concluded that waterjet is an effective method for piercing short fiber/ceramic composites but the piercing behavior is closely related to the fiber orientation. Keywords: ceramic-matrix composite, carbon fiber, waterjet, piercing Kompoziti s kerami~no matrico in kratkimi vlakni kot oja~itveno fazo so relativno poceni, ker jih je mo`no izdelovati z enostavnim postopkom. Rezanje oz. mehanska obdelava zelo trdih materialov se pogosto izvaja z vodnim curkom, ki je zelo u~inkovit postopek. Vendar pa je bilo do sedaj izvedeno zelo majhno {tevilo {tudij, ki obravnavajo obna{anje vodnega curka med prodiranjem skozi kerami~ne materiale v katerih se nahajajo kratka vlakna. V {tudiji so avtorji izdelali Cf/Al2O3 kompozit z in-situ pretvorbo predoksidiranih poliakrilonitrilnih vlaken v ogljikova (Cf) vlakna, med enoosnim vro~im sintranjem pod tlakom Al2O3 matrice. Pod enoosnim tlakom so se vlakna prednostno orientirala vzporedno z vro~e stiskano povr{ino. Za primerjavo z izdelanim kompozitom so izbrali izhodno Al2O3 keramiko. Eksperimentalni rezultati so pokazali, da je mehansko obdelana povr{ina z ve~ino paralelnih vlaken, ustrezna. Povpre~na globina prodiranja vodnega curka v kompozit je bila pribli`no 1,5-krat ve~ja pri uporabi~istega vodnega curka in 5-do 7-krat ve~ja pri uporabi vodnega curka z dodatkom abrazivnega sredstva, kot pri primerjalni~isti Al2O3 keramiki. Mehanizmi erozije prodiranja s~istim vodnim curkom so v kerami~ni matrici imeli zna~ilnosti inter-in trans-granularnega preloma ter drobljenja vlaken. Pri uporabi vodnega curka z dodatkom abrazivnega sredstva je pri{lo do mikro-prelomov kerami~nih zrn sk...

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“…The reason behind this selection is the non-physical contact between the tool and workpiece and negligible cutting forces [9]. In the field of non-conventional process, abrasive water jet (AWJ) is most suitable application because it does not require the conductance of the material to be cut [10].…”

Section: Introductionmentioning

confidence: 99%

Surface Roughness Report and 3D Surface Analysis of Hybrid Metal Matrix Composites (MMC) During Abrasive Water Jet (AWJ) Cutting

Srivastava¹,

Dwivedi²,

Maurya³

et al. 2020

RCMA

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The conventional machining of engineering hard materials like composites is a challenging task due to rapid tool wear and high machining cost. In this context, the non-conventional machining such as abrasive waterjet cutting is mostly utilized for the cutting of such hard materials due to its tremendous machining outcomes. Here an attempt is made to cut the previously developed sample of hybrid metal matrix composite A359/B4C/Al2O3 by abrasive waterjet machining process. Three different samples with change proportions of reinforcement from 2% to 4% were used in this study to create the flat machined surfaces. The surface roughness profile and 3D surface detailing are generated through the microprof FRT machine and inbuilt measuring sensor. Result revels that rough cutting with the average surface roughness value ranges from 7 to 9 µm for the selected samples. The machined surface is full of cutting traces with some of macro pores of size 1.2 mm to 1.8 mm observed by 3D profile views.

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Processing of alumina ceramics by abrasive waterjet- an experimental study

Cited by 11 publications

References 12 publications

Influence of Variable Radius of Cutting Head Trajectory on Quality of Cutting Kerf in the Abrasive Water Jet Process for Soda–Lime Glass

Influence of Variable Radius of Cutting Head Trajectory on Quality of Cutting Kerf in the Abrasive Water Jet Process for Soda–Lime Glass

Piercing behavior of an in-situ Cf/Al2O3 composite in waterjet machining

Surface Roughness Report and 3D Surface Analysis of Hybrid Metal Matrix Composites (MMC) During Abrasive Water Jet (AWJ) Cutting

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