technology will enable it to use all the recyclate internally.
The only practical problem with the process is that multi-reactor alloying
is so complex that it needs very fine controls, or it makes a lot of waste byproducts, a technical source at Himont says.
Some executives still see the cost advantages in alloying
. "No new material development effort is ever cheap," says John E.
Preliminary work is also under way at Himont to see if Hivalloy alloying
technology can compatibilize mixed post-consumer plastic resins in recycling, says Himont director of business development Ken Dargis.
An example of this alloying
thrust comes from Dow Chemical U.S.A., Midland, Mich., which recently introduced its new Sabre family of PC/PET and PC/PBT alloys for automotive body panels (see PT, April '91, p.
Copolymerization and alloying
will drive advances in new engineering thermoplastics of the 1990s.
This article examines five alloying
elements as possible pearlite stabilizers to promote improved properties in gray cast iron production.
A polar-copolymer PP would have reactive or adhesive functionality, overcoming the usual inertness of PP and providing greater compatibility with other resins for alloying
or better wettability of fillers and reinforcements.
Slag typically refers to high-temperature fluxing of refractory linings of furnaces/ladies and oxidation products from alloying
. Dross typically refers to oxidation or reoxidation products in liquid metal from reaction with air during melting or pouring, and can be associated with either high or low pouring temperature alloys.
New Technology in Alloying
, Compatibilizers & Reactive Compounding
While various alloying
elements may alter the properties of cast iron, it is accomplished primarily through the crystallization of dissolved carbon into graphite.
Knechtges said the thrust of this new material development has been engineering "the vinyl molecule and building off of it," as well as the molecular coupling and alloying
of vinyl with other resins.
In aluminum-silicon (Al-Si) hypoeutectic alloys, strontium is often added for modification of the Si structure during the alloying
Besides hydrogen content, factors such as cooling rate, modification, alloying
elements, grain refinement and inclusion content play a role in forming porosity.
Feeding properties--Working with the designer, make any needed adjustments t the alloy's composition (additions of or dilution in alloying
elements) to improve feeding characteristics such as freezing range, eutectic volume and casting fluidity.