Factors affecting strength and shape retention of zirconia micro bending bars during thermal debinding

Çetinel, Fatih A.; Bauer, Werner; Knitter, Regina; Haußelt, J.

doi:10.1016/j.ceramint.2011.04.076

Cited by 16 publications

(6 citation statements)

References 26 publications

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“…A sample containing nano-sized and micro-sized alumina particles was shown to possess higher density than the sample containing only nano-sized or micro-sized alumina particles and the sample obtained via vacuum debinding had a higher density. Fatih [15] studied the shape retention properties of low-pressure injection molded (LPIM) zirconia during thermal debinding. The distinctive surface binder film was found to have healing and leveling effects on the surface defects, thus improving the strength of the parts.…”

Section: Introductionmentioning

confidence: 99%

Study on defect-free debinding green body of ceramic formed by DLP technology

Wang

Qiu

Jiao

et al. 2020

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Study on defect-free debinding green body of ceramic formed by DLP technology

Wang

Qiu

Jiao

et al. 2020

Ceramics International

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“…In the case of some LPIM binder systems, debinding is particularly challenging since the binder consists simply only of wax or just a small amount of a polymer backbone that would hold the particles together during thermal debinding [200]. When the wax binder in LPIM-shaped components melts during thermal debinding, only weak attractive forces hold the powder particles together; hence, even slight stresses can result in irreversible deformation [92].…”

Section: Thermal Wick Debindingmentioning

confidence: 99%

Research Progress on Low-Pressure Powder Injection Molding

et al. 2022

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Powder injection molding (PIM) is a well-known technique to manufacture net-shaped, complicated, macro or micro parts employing a wide range of materials and alloys. Depending on the pressure applied to inject the feedstock, this process can be separated into low-pressure (LPIM) and high-pressure (HPIM) injection molding. Although the LPIM and HPIM processes are theoretically similar, all steps have substantial differences, particularly feedstock preparation, injection, and debinding. After decades of focusing on HPIM, low-viscosity feedstocks with improved flowability have recently been produced utilizing low-molecular-weight polymers for LPIM. It has been proven that LPIM can be used for making parts in low quantities or mass production. Compared to HPIM, which could only be used for the mass production of metallic and ceramic components, LPIM can give an outstanding opportunity to cover applications in low or large batch production rates. Due to the use of low-cost equipment, LPIM also provides several economic benefits. However, establishing an optimal binder system for all powders that should be injected at extremely low pressures (below 1 MPa) is challenging. Therefore, various defects may occur throughout the mixing, injection, debinding, and sintering stages. Since all steps in the process are interrelated, it is important to have a general picture of the whole process which needs a scientific overview. This paper reviews the potential of LPIM and the characteristics of all steps. A complete academic and research background survey on the applications, challenges, and prospects has been indicated. It can be concluded that although many challenges of LPIM have been solved, it could be a proper solution to use this process and materials in developing new applications for technologies such as additive manufacturing and processing of sensitive alloys.

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“…122 Alexandria Dental Journal. Volume 46 Issue 2 Section B Factors affecting flexural strength of Zirconia include; grain size, shape of the Zirconia particles, and its tetragonal-monoclinic phases transformation toughening phenomenon (1), sintering temperature (12), number and size of surface flaws and surface roughness (13). When a material is tested for flexural strength, the surface subjected to the load is under compressive stress while the other surface is under tensile stress.…”

Section: A D Jmentioning

confidence: 99%

Effect of Air-Borne Particle Abrasion/Sintering Sequence on the Flexural Strength of Zirconia.

El-Kashlan

Hammad

El-Fawal

2021

Alexandria Dental Journal

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INTRODUCTION:Zirconia represents a valuable material that combines both color acceptance and ability to withstand high loads. It had been reported that sintering of Zirconia followed by air-borne particle abrasion affect its strength. The effect of air-borne particle abrasion/sintering sequence on shear bond strength of resin cements to Zirconia was found non-significant; however the effect of sequence on the flexural strength has not been reported. The Ivoclare Vivadent manufacturer recommendation is to sinter the Zirconia before subjecting it to any air-borne particle abrasion. AIM OF THE STUDY: to evaluate the effect of air-borne particle abrasion/sintering sequence on the flexural strength of Zirconia. MATERIALS AND METHOD: forty bars of dimensions (26 × 6 × 1.5 millimeter) were fabricated from IPS e-max zircad. The total number of specimens was divided into two equal groups (A and B). The specimens of group A (AS) were subjected to air-borne particle abrasion followed by sintering. However specimens of group B (SA) were sintered before air-borne particle abrasion. Specimens of each group were subjected to X-Ray Diffraction to show monoclinic-tetragonal phases percentage. Three-point loading was applied to all specimens to measure the flexural strength using a Universal Testing Machine. RESULTS: At statistically significant level p ≤ 0.05. Group SA has showed significantly higher flexural strength compared to group AS. Airborne particle abraded surface of group SA showed the highest amount of monoclinic phase crystals after X-Ray Diffraction analysis. CONCLUSIONS: Air-borne particle abrasion/sintering sequence affects flexural strength of Zirconia. Air-borne particle abrasion surface treatment induces tetragonal to monoclinic phase transformation in fully sintered Zirconia.

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Factors affecting strength and shape retention of zirconia micro bending bars during thermal debinding

Cited by 16 publications

References 26 publications

Study on defect-free debinding green body of ceramic formed by DLP technology

Study on defect-free debinding green body of ceramic formed by DLP technology

Research Progress on Low-Pressure Powder Injection Molding

Effect of Air-Borne Particle Abrasion/Sintering Sequence on the Flexural Strength of Zirconia.

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