Erratum

Luckey, Hugh A.; Lamprecht, Elden G.; Walt, Michael J.

doi:10.1002/jbm.820261011

Cited by 3 publications

(4 citation statements)

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“…This finding was markedly inconsistent with that of Luckey et al [11], who investigated the shear strength of plasma-sprayed CoCr alloy coating and conventional sintered bead coating in cortical and cancellous bone of dogs after 8 and 16 weeks of implantation. Their results revealed that although the plasma-sprayed CoCr alloy coating exhibited lower overall average shear strength in cortical bone sites at both time periods (4.31 MPa at 8 weeks and 9.77 MPa at 16 weeks), the differences were not statistically significant.…”

Section: Discussioncontrasting

confidence: 56%

“…In a study by Luckey et al [11], the biological fixation capability of a nonporous, high-integrity plasma-sprayed CoCr (ASTM F75 alloy) coating was compared to a conventional sintered-bead CoCr coating in goats. The plasma-sprayed CoCr coating was developed to minimize the adverse changes in material characteristics compared to the sintered porous-beaded devices.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and histological evaluations of cobalt-chromium alloy and hydroxyapatite plasma-sprayed coatings in bone

Yang

Wang

Chang

et al. 1996

J Mater Sci: Mater Med

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This study evaluated the mechanical and histological behavior of cobalt-chromium (CoCr) alloy and hydroxyapatite (HA) plasma-sprayed coatings in canine cortical bone after 6 and 12 weeks of implantation, using CoCr alloy as the substrate. The substrate was bond-coated with microtextured CoCr alloy coating to ensure adherence between the substrate and top coats. A macrotextured CoCr alloy top coat with surface roughness Ra =34.25 _+ 5.50 I~m was produced to create suitable pores ranging from 25 t~m to 200 I~m for bone ingrowth. For HA top coat, a relatively smooth surface (Ra= 15.14+3.21 gm) was prepared for bone apposition. Shear testing of bone/implant interfaces showed that the CoCr alloy top coat exhibited significantly lower (p < 0.01) mean shear strength than the HA top coat at each time interval. The maximum shear strength was 10.884-0.38 MPa for HA-coated implants 12 weeks post-implantation. After histological evaluations, substantial differences in the extent of new bone formation and the types of implant/bone contact were found between two kinds of implants. Direct bone-to-HA coating contact was consistently observed, while a layer of fibrous tissue intervening at the bone CoCr alloy coating interface was found. Occasionally, partial dissolution of HA coating was seen after 12 weeks of implantation. The results of this study suggested that plasma-sprayed macrotextured CoCr coatings may not be an effective alternative for biological fixation.

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Section: Discussioncontrasting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Mechanical and histological evaluations of cobalt-chromium alloy and hydroxyapatite plasma-sprayed coatings in bone

Yang

Wang

Chang

et al. 1996

J Mater Sci: Mater Med

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“…As the coefficient of friction increases, the material flow is restricted and thickness is preserved in the areas which first come in contact with the tool, Figure 1. Therefore, thickness distribution in the final part is dependent on friction, forming pressure cycle and the geometry of the die cavity (in particular the cavity aspect ratio and the ratio of entry radius to sheet thickness) [4][5][6][7]. This implies that for a given geometry, both the forming time and thickness distribution can be manipulated by changing the fric-tion.…”

Section: Introductionmentioning

confidence: 99%

A method for the systematic assessment of lubricant performance during superplastic sheet forming

Farrell

Drábek

Qarni

2017

Materialwissenschaft Werkst

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Frictional forces at the die‐sheet interface during superplastic forming play an important role in controlling material flow. As such, lubricious coatings are routinely used to facilitate a low friction flow of sheet metal into the die cavity. They may also act as parting agents and/or oxidation barriers. The selection of coatings for the superplastic forming of Ti‐6Al‐4 V is limited by the requirement of thermomechanical stability at the high forming temperature, therefore, solid film coatings such as boron nitride are a common choice. However, little work has been published on coating performance during superplastic forming, particularly under true process conditions. This paper presents a method for the systematic assessment of superplastic forming coating performance by using a multi‐pocket die, which allows many coating types and combinations to be tested simultaneously during a single forming cycle. Sixteen coating combinations were evaluated in total and the resultant sheet thickness distributions compared, serving as an indicator of friction.

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“…This method, i.e. cementless fixation [1], has replaced polymethylmethacrylate (PMMA) bone cement fixation. However, in spite of the merits of porous coatings, there were problems when cases of implanted.…”

Section: Introductionmentioning

confidence: 99%

A study on porous super austenitic stainless steel coating for improvement of bone ingrowth

Park

1998

Metals and Materials

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In this study, the prostheses were provided with the bone ingrowth site by coating the super stainless steel powder on the same substrate ($32050) using plasma spraying method. Plasma current and powder feed rate varied in this study based on the optimum conditions of previous experiments. The optimum conditions for satisfying the requirements of the porous coatings were found. The characteristics of the coatings were observed according to the experimental parameters. It was found that plasma current influenced the chemical composition (the oxides, Cr component), melting and flattening degree of the sprayed particle (surface roughness, thickness of the splat, pores) and corrosion -resistance. The powder feed rate also influenced the coating thickness and efficiency. The amount of Cr was increased, but Ni, Mo, Fe were decreased with plasma current. An increase of Cr in the coating surface corresponded to an increase in the amount of the formed oxides. The coated specimen in 400A had a high corrosion-resistance owing to a dense coating. The coated specimen in 500A formed many types of oxides. In 300A current, the coating was rough with many pores, and corrosion-resistance of the coating showed a large variation according to the oxidation and compositional change. Specifically at 100 g/min powder feed rate in a 300A current, the coating was rough and porous, nevertheless, it had high corrosion resistance.

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Erratum

Abstract: Please note that on page 558, paragraph 2, sentence 4 should read: "A final plasma-sprayed coating thickness of approximately 500 pm was obtained, which exhibited an RMS surface roughness of approximately 25 pm."

Cited by 3 publications

References 0 publications

Mechanical and histological evaluations of cobalt-chromium alloy and hydroxyapatite plasma-sprayed coatings in bone

Mechanical and histological evaluations of cobalt-chromium alloy and hydroxyapatite plasma-sprayed coatings in bone

A method for the systematic assessment of lubricant performance during superplastic sheet forming

A study on porous super austenitic stainless steel coating for improvement of bone ingrowth

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