An article in Quality Progress describes the use of factorial experiments to improve a silver powder production process. This product is used in conductive pastes to manufacture a wide variety of products ranging from silicon wafers to elastic membrane switches. Power density (g/cm3) and surface area (cm2/g) are the two critical characteristics of this product. The experiments involved three factors: reaction temperature, ammonium percentage, and stirring rate. Each of these factors had two levels, and the design was replicated twice. The design is shown in table 13.E8.

(a) Analyze the density response. Are any interactions significant? Draw appropriate conclusions about the effects of the significant factors on the response.
(b) Prepare appropriate residual plots and comment on model adequacy.
(c) Construct appropriate plots to aid in practical interpretation of the density response.
(d) Analyze the surface area response. Are any interactions significant? Draw appropriate conclusions about the effects of the significant factors on the response.
(e) Prepare appropriate residual plots and comment on model adequacy.
(f) Construct appropriate plots to aid in practical interpretation of the surface area response.

Transcribed Image Text:

- TABLE 13E.8 Silver Powder Experiment from Exercise 13.23 Stir Rate Temperature Surface Ammonium ( % ) -C) Density Area ' RPM) 100 100 100 100 150 150 150 100 100 100 100 150 150 4.68 0.40 15.18 043 15.12 042 17.48 041 754 069 6.66 067 1246 052 2.62 036 0.95 058 7.68 043 12.65 057 15.96 054 803 068 884 075 14.96 0.41 1496 041 30 150