Shrinkage properties of ceramic injection moulding part with a step-contracted cross-section in the filling direction

Chen, Ren-Haw; Ho, Chi Hung; Fan, Hong Chang

doi:10.1016/j.ceramint.2003.10.017

Cited by 8 publications

(11 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Evidences shown that packing pressure can lead to directional responses in terms of shrinkage: by improving holding pressure, transversal shrinkage of ceramic molded parts was decreased [76]. Similar results were reported by Pomerleau and Sanschagrin [77] that confirmed how high holding pressure leads to lower shrinkage (both parallel to, than normal to, the flow direction).…”

Section: Processing Parameter Influencessupporting

confidence: 62%

“…Authors [52,77] have shown that high values of this parameter leads to high shrinkage in parallel to but not in normal to the flow direction. An influence of this parameter but with different effect with respect to the previous authors was identified by Chen, Ho, and Fan [76] by analyzing ceramic feedstock: to increase the injection speed led to decrease the transversal shrinkage.…”

Section: Processing Parameter Influencesmentioning

confidence: 91%

See 1 more Smart Citation

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

123

View full text Add to dashboard Cite

Purpose: This paper reviews the factors affecting shrinkage of molded parts in injection molding. Methods: A selective screening of the papers published in the last 10 years was adopted. The review was organized according to molding scale (macro or micro) and by considering four branches of influence: material behaviors, processing parameters, mold, and specimen design. Results: Within the interval of confidence, at the macroscale, critical processing parameters were the temperatures, the packing parameters, cooling time, and injection speed; temperatures and packing parameters resulted critical factors at the microscale as well. Concerning the design aspects, the runner size and the ribs affect shrinkage at the macro and microscale, respectively. The analysis of the literature review has shown an absence of statistical approach for determining the material influences, a lack of information on shrinkage occur in powder-molded parts and the absence of data in specimen with dimensions below 10 m. Conclusions: The review collected the factors that affect shrinkage in injection molding, and identified three possible areas for further works.

show abstract

Section: Processing Parameter Influencessupporting

confidence: 62%

Section: Processing Parameter Influencesmentioning

confidence: 91%

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

123

View full text Add to dashboard Cite

show abstract

“…This difference can explain why the linear shrinkage of small holes is smaller than that of substrate. This is due to the smaller relative density of the wall of the green small-hole arrays [16]. What is more, experimental results indicate that the relative density and hardness of micro-structured part sintered under 1,500°C for 2 h are 98.5% and 13.75 GPa, respectively.…”

Section: Microstructure and Densitymentioning

confidence: 66%

“…This may cause the particles of the ceramic powders in the feedstock to be oriented in the direction of the shear. The filling of the feedstock also changes from close to loose through the variable crosses section due to the sudden increase in shear stress [16]. The differences of the temperature in the substrate and the thin wall between two neighborhood small holes are also considered to be one reason [17].…”

Section: Properties Of Feedstockmentioning

confidence: 99%

Small-hole arrays of ceramic material manufactured by micro powder injection molding

Wang

Zhang

2011

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Ceramic substrate with three kinds of small-hole arrays (the minimum diameter is 400 μm) was manufactured by micro powder injection molding. The homogeneity, thermal, and rheological properties of the feedstock was characterized by means of SEM, Archimedes method, TGA, DSC, and capillary rheometer, respectively. The feedstock has good uniformity and the viscosity of feedstock accords with the pseudo-plastic behavior which is suitable for micro powder injection molding. The test results also show that the linear shrinkage of small holes is lower than the substrate which is important to mold design and size contraction of the sample. Moreover, the porosity of the sintered substrate is lower than that of the thin wall between two neighborhood small holes. Good surface roughness of the sintered samples is obtained by using sub-micron ZrO 2 powder which is even lower than molded surface. The relative density and hardness of the ceramic substrate with small-hole arrays sintered under 1,500°C for 2 h is 98.3% and 13.68 GPa, respectively.

show abstract

“…The influences of powder injection molding process parameters on shrinkage for Fe-Ni samples were found using a Vernier caliper and micrometer [12]. The shrinkage for alumina ceramics used for MEMS application was measured with a resolution of 1 μm using a charge coupled device microscope [13]. The linear shrinkage of ceramic composites found using dilatometer at different temperature was used to estimate density and activation energy [14][15].…”

Section: Literature Surveymentioning

confidence: 99%