The
alloying 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 process.
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.
