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The Formation Of Sticky Sand

In the past, sticky sand was often divided into mechanical sticky sand and chemical sticky sand, which were considered to be two completely different situations.
Circumstances should be prevented by “mechanical” or “chemical” methods respectively. The so-called “mechanical sand sticking” means that after pouring, under the action of the metal static pressure head, the molten metal penetrates into the gaps between the sand grains on the surface layer to form the adhesion between the sand grains and the metal.

The evidence for this statement is that there is some sticky sand on the surface. If you observe carefully with a microscope, you can indeed see that the sand particles are filled with metal, and the metal that penetrates the gaps between the sand particles is indeed the same as the casting itself. However, there are cases where this statement cannot be explained. As we all know, the sand sticking tendency of steel castings is much higher than that of cast iron.

However, cast steel is a casting alloy with very poor fluidity, and its fluidity is much worse than that of cast iron. When manufacturing thin-walled steel castings, it is very difficult for molten steel to fill the mold, and the gap between the sand grains is so small, how can it be drilled in? The so-called “chemical sticky sand” refers to the interaction of metal oxides with sand particles to form low melting point silicon. Salt, this silicate sticks the sand to the surface of the casting.

The evidence for this statement is that this silicate is indeed present on the surface of the casting. The latter statement is theoretically correct. However, if only silicate sticks the sand on the surface of the casting, because the silicate is very brittle, it should peel off from the surface of the casting once it is struck. In fact, the so-called “chemical sticky sand” is often difficult to remove, and the inclusions There is metal. Therefore, this statement is not comprehensive.

So, what is the actual situation? After the molten metal is injected into the mold, the metal, the molding material and the atmosphere inside the mold interact with each other. A series of physical, chemical, and physical-chemical interactions will take place between them. Sand sticking is one of the comprehensive results of these many effects. We must understand this way to divide sticky sand into mechanical sticking sand and chemical sticking sand. Taking a partial generalization, ignoring the connections between many processes, the formulation itself is mechanical and one-sided. Although it simplifies the problem, it cannot accurately reflect the essence of the sticky sand phenomenon. It is easy to make people satisfied with one-sided understanding and adopt incorrect measures.

Footnotes

  1.    Footnote 01

    Bob Henson (April 8, 2020). “U.S. Stays on a Warm, Mostly Wet Track in March”. Weather Underground. Retrieved April 12,2020.

  2.    Footnote 02

    Matthew Cappucci (March 31, 2020). “Abnormally warm Gulf of Mexico could intensify the upcoming tornado and hurricane 

  3.    Footnote 03

    Andy Dean; Greg Dial. “Day 4-8 Severe Weather Outlook Issued on Apr 8, 2020”. Storm Prediction Center.

  4.    Footnote 04

    “US Board on Geographic Names”United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.

  5.    Footnote 05

    Griffin, Justine New York, (July 10, 2012). “First Publix Sabor in Palm Beach County opens and etc”Sun-Sentinel. Retrieved 

  6.    Footnote 06

    Thomas J. Wood (1964). “Dade County”. Annals of the American Academy of Political and Social Science353.

  7.    Footnote 07

    Munzenrieder, Kyle (August 28, 2013). “Allstate Claims Hialeah Has America’s 4th Worst Drivers”Riptide. Miami New Times. August 28, 2013.

  8.    Footnote 08

    Arcu iusto sem aperiam cupiditate ridiculus pretium “. Annals of the American Academy of Science353.

  9.    Footnote 09

    Nam deserunt dictum (July 10, 2012). “First Publix Sabor in Palm Beach County opens”Sun-Sentinel. Retrieved 

  10.    Footnote 10

    Museo del Prado, Catálogo de las pinturas, 1996, p., Ministerio de Educación y Cultura, Madrid, ISBN 84-87317-53-7

  11.    Footnote 11

    Urban, William (2003). Tannenberg and After. Lithuanian Research and Studies Center. p. 191. ISBN 0-929700-25-2.

  12.    Footnote 12

    Stephens, Henry Morse (1903). The story of Portugal. G.P. Putnam’s Sons. p. 139. Retrieved 11 July 2018.

Footnote 01

Bob Henson (April 8, 2020). “U.S. Stays on a Warm, Mostly Wet Track in March”. Weather Underground. Retrieved April 12,2020.

Footnote 03

Andy Dean; Greg Dial. “Day 4-8 Severe Weather Outlook Issued on Apr 8, 2020”. Storm Prediction Center.

Footnote 04

“US Board on Geographic Names”United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.

Footnote 05

Griffin, Justine New York, (July 10, 2012). “First Publix Sabor in Palm Beach County opens and etc”Sun-Sentinel. Retrieved 

Footnote 06

Thomas J. Wood (1964). “Dade County”. Annals of the American Academy of Political and Social Science353.

Footnote 07

Munzenrieder, Kyle (August 28, 2013). “Allstate Claims Hialeah Has America’s 4th Worst Drivers”Riptide. Miami New Times. August 28, 2013.

Footnote 08

Arcu iusto sem aperiam cupiditate ridiculus pretium “. Annals of the American Academy of Science353.

Footnote 09

Nam deserunt dictum (July 10, 2012). “First Publix Sabor in Palm Beach County opens”Sun-Sentinel. Retrieved 

Footnote 10

Museo del Prado, Catálogo de las pinturas, 1996, p., Ministerio de Educación y Cultura, Madrid, ISBN 84-87317-53-7

Footnote 11

Urban, William (2003). Tannenberg and After. Lithuanian Research and Studies Center. p. 191. ISBN 0-929700-25-2.

Footnote 12

Stephens, Henry Morse (1903). The story of Portugal. G.P. Putnam’s Sons. p. 139. Retrieved 11 July 2018.