Tailoring the heat transfer on the injection moulding cavity by plasma sprayed ceramic coatings

Bobzin, Kirsten; Hopmann, Christian; Öte, Mehmet; Knoch, Martin; Alkhasli, Ilkin; Dornebusch, Hanna; Schmitz, Mauritius

doi:10.1088/1757-899x/181/1/012013

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…Among the several types of coatings, nitrides gain prominence in the literature. Titanium-based nitrides are applied mainly to improve tribological properties [ 49 , 50 , 51 ], while zirconium-based nitrides act as thermal barriers to reduce the cooling rate, mainly in microinjection [ 19 , 52 ]. However, ternary metal and nitride alloys (e.g., TiSiN and TiAlN) have gained ground and replaced binary alloys in many applications.…”

Section: Coating Of the Injection Mold Cavitymentioning

confidence: 99%

“…TiAlN coatings also provide good corrosion resistance because, at high temperatures, the aluminum tends to form an Al 2 O 3 layer on the surface in a passivation process [ 19 ]. However, coatings deposited by PVD techniques can sometimes present defects, such as pores and pinholes, which compromise the ability of the coating to protect the metal substrate from corrosion, especially in more aggressive environments [ 51 , 54 ].…”

Section: Coating Of the Injection Mold Cavitymentioning

confidence: 99%

“…Bobzin et al [ 51 ] analyzed the influence of the coating of yttria-stabilized zirconia (YSZ) on the temperature distribution over a plate ( Figure 7 ).…”

Section: Coating Of the Injection Mold Cavitymentioning

confidence: 99%

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Modification of the Cavity of Plastic Injection Molds: A Brief Review of Materials and Influence on the Cooling Rates

Carrupt

Piedade

2021

Materials

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In the 21st century, a great percentage of the plastic industry production is associated with both injection molding and extrusion processes. Manufactured plastic components/parts are used in several industry sectors, where the automotive and aeronautic stand out. In the injection process cycle, the cooling step represents 60% to 80% of the total injection process time, and it is used to estimate the production capabilities and costs. Therefore, efforts have been focused on obtaining more efficient cooling systems, seeking the best relationship between the shape, the quantity, and the distribution of the cooling channels into the injection molds. Concomitantly, the surface coating of the mold cavity also assumes great importance as it can provide increased hardness and a more straightforward demolding process. These aspects contribute to the decrease of rejected parts due to surface defects. However, the effect of the coated cavity on the heat transfer and, consequently, on the time of the injection cycle is not often addressed. This paper reviews the effects of the materials and surface coatings of molds cavity on the filling and cooling of the injection molding cycle. It shows how the design of cooling channels affects the cooling rates and warpage for molded parts. It also addresses how the surface coating influence the mold filling patterns and mold cooling. This review shows, more specifically, the influence of the coating process on the cooling step of the injection cycle and, consequently, in the productivity of the process.

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Section: Coating Of the Injection Mold Cavitymentioning

confidence: 99%

Section: Coating Of the Injection Mold Cavitymentioning

confidence: 99%

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Modification of the Cavity of Plastic Injection Molds: A Brief Review of Materials and Influence on the Cooling Rates

Carrupt

Piedade

2021

Materials

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“…Instead, APS has drawn much attention due to its advantages of high efficiency, low cost and high flexibility 13,14 . APS process has been considered as a versatile and cost‐effective technique with high deposition rate and is the most suitable method for thick coatings preparation 15 …”

Section: Introductionmentioning

confidence: 99%

Plasma sprayed thermal barrier coatings: Effects of polyamide additive on injection molding part quality

Xie

Chen

Ye³

et al. 2021

J of Applied Polymer Sci

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A simple and economic atmospheric plasma spraying method for thermal barrier coatings (TBCs) preparation on the mold cavity was developed to improve the injection parts properties. 7 wt% yttria stabilized zirconia was used as spray material with polyamide 11 (PA 11) as pore‐forming agents to improve the coating properties. The effect of PA 11 powder contents on the microstructure, thermal conductivity, bonding strength and hardness of TBCs were studied. The results show that the thermal conductivity of TBCs decreased with the addition of PA 11, and the bonding strength reached maximum of 21.38 MPa with 10% PA 11 addition. Further studies confirm that TBCs were able to maintain a high and stable temperature in the mold cavity due to its low thermal conductivity, validated by the elimination of the welding line. With TBCs, the average tensile strength and elongation at yield of the injection parts increased by 25.6% and 128%, respectively.

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Temperature distribution on thermally sprayed heating conductor coatings

Bobzin

Öte

Knoch

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Tailoring the heat transfer on the injection moulding cavity by plasma sprayed ceramic coatings

Cited by 3 publications

References 3 publications

Modification of the Cavity of Plastic Injection Molds: A Brief Review of Materials and Influence on the Cooling Rates

Modification of the Cavity of Plastic Injection Molds: A Brief Review of Materials and Influence on the Cooling Rates

Plasma sprayed thermal barrier coatings: Effects of polyamide additive on injection molding part quality

Temperature distribution on thermally sprayed heating conductor coatings

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