Inoculant


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.

inoculant

[i′näk·yə·lənt]
(metallurgy)
A substance which augments a melt, usually in the latter part of the melting operation, thus altering the solidification structure of the cast metal, as in grain refinement of aluminum alloys.

Inoculant

 

a substance added to a metal or alloy in small quantities, causing a significant change in its structure and properties. The effect of such treatment is called inoculation.

According to the classification of P. A. Rebinder, inoculants are divided into two groups. The first group includes surface-active substances, which are adsorbed on the nuclei that form on crystallization centers and retard their growth, resulting in the appearance of a large number of new nuclei, whose growth becomes possible as the concentration of the inoculant on their surfaces decreases.

Inoculants of the second type facilitate the formation of crystallization centers, such as colloidal particles, which affect the nucleation of crystals of the metallic phase during hardening. Upon the appearance of a large number of such centers, there is increased formation of fine granules of the principal phase or fine inclusions of other phases. Phases that otherwise would not be formed in the material sometimes crystallize on such centers.

Inoculants of both groups disintegrate granules (inclusions), but inoculants of the first group enhance the supercooling of melts during crystallization, and those of the second group reduce supercooling.

REFERENCE

Rebinder, P. A., and M. S. Lipman. “Fiziko-khimicheskie osnovy modifikatsii metallov i splavov malymi poverkhnostno aktivnymi primesiami.” In Issledovaniia v oblasti prikladnoi fiziko-khimii poverkhnostnykh iavlenii. Moscow-Leningrad, 1936.

A. A. ZHUKOV

References in periodicals archive ?
Effects of homolactic bacterial inoculant alone or combined with an anionic surfactant on fermentation, aerobic stability and in situ ruminal degradability of barley silage.
Added versatility and reliability stem from the first ever inclusion in a forage inoculant of Lactobacillus salivarius.
In addition to the seasonal flux in population size and diversity, we compared the nitrogen fixing effectiveness of isolates representing some of the major RAPD-PCR groups (defined by the primer RPO1) against the inoculant strains WU95 and TA1.
About 20 years ago, inoculant producers started selling sterile carrier inoculants.
At a market share of 84%, LAB is a major inoculant leading the market.
To our knowledge, from microbiological perspective, little information is available on the microbial ecology of fresh wheat material, especially the inhabited LAB, which determines whether inoculant needs to be used.
Prof Jamie Newbold and Dr Neil McEwan aim to tap into worldwide silage inoculant sales of pounds 100m-pounds 200m.
The use of chemical food preservatives as a means of promoting aerobic stability has been gaining momentum, and there are now products that work practically in a farm environment in combination with a biological inoculant.
They recently conducted an experiment in which they chopped some transgenic alfalfa plants into 2-centimeter pieces, treated them with a bacterial inoculant, applied caffeic acid to about half of them, and let them sit for 2 weeks.
To help legumes deposit more nitrogen in the soil, treat seeds with legume inoculant before planting.