Hardener


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hardener

[′härd·ən·ər]
(metallurgy)
A master alloy added to a melt to control hardness.
(organic chemistry)
Compound reacted with a resin polymer to harden it, such as the amines or anhydrides that react with epoxides to cure or harden them into plastic materials. Also known as curing agent.

Hardener

 

in metallurgy, an auxiliary alloy used to introduce alloying elements into liquid metal for the purpose of imparting specific properties to the metal melt (for example, fluidity) or the solidified metal (increased mechanical strength). The assimilation of an alloying element from the hardener is greater and more stable than if the element were introduced in pure form. Hardeners are produced by fusion of their components or by reduction from ores, concentrates, or oxides. In ferrous metallurgy, hardeners are distinguished from ferroalloys, which are used for both alloying and deoxidation of metals. Metals that are added to precious metals (for example, gold or silver) to impart to them the necessary properties (for example, hardness) or to reduce the cost of manufactured articles are also called hardeners. Copper and mercury are used as hardeners.

hardener

1. A chemical (including certain fluosilicates or sodium silicate) applied to concrete floors to reduce wear and dusting.
2. A material added to a paint or varnish vehicle to increase the gum or resin content, or to increase rate of oxidation, so as to cause an increase in hardness of the drying film.
3. The chemical component in a two-component coating or adhesive which causes the resin component to harden.
References in periodicals archive ?
Standard Curve Making: A sample of 5 g commercial hardener was weighed and put in a vacuum drying oven at 70[degrees]Cfor 24 hr to remove the solvent and water.
Figure 5 shows the TGA curves of a series of epoxy resins cured by different hardener.
Table 1: Code and composition of prepared coatings Composition code Initial wt% of EB-PANi in hardener NR 0 EP-0.
5 %, and degree of vanadium recovery increases up to 92-95 %, whereby up to 50 % of vanadium-containing hardener of the following composition is produced from the ShVd-1 slag, %: 17-22 V; 4-7 Si; 2-6 Cr; 5-10 Mn; 2-3 Ti; 0.
Solder mask A and F became more brittle as the hardener component of the mixture increased, but the opposite effect was observed on solder mask B, C, and D.
Nickel-coated graphite (Novamet Company), epoxy resin (Araldite GZ471-X75, Huntsman Company), and its polyamine hardener (Aradur 283, Huntsman Company) were also used to evaluate the effect of conductive filler and resin type on the electrical resistivity of nanoclay conductive coatings.
The hardener markedly affects the TL intensity of the unexposed systems.
3) Stir in Waste Away Paint Hardener ($2) and wait about 20 minutes until it's hard enough to throw away.
Where there is substantial decay, use a wood hardener before applying the filler.
Huntsman Performance Plastics has announced a new product, XTJ-590, designed to serve as a fast-curing epoxy hardener at low temperature while providing good mechanical properties.
With certain sands, changing the type of sand, the type of binder, or the ratio of hardener to binder may be necessary to achieve satisfactory results with the reclaimed sand.
An improved oxazolidine-based hardener to be used with a resorcinol resin or a tannin resin as the adhesive for the bonding of wood articles.