SU511119A1 - Method of rolling lanthanum - Google Patents

Description

one

This invention relates to the rolling of rare earth metals,

 The known method of hot plastic deformation of some rare earth metals in air. For example, thulium prokatshaps in several passes in air at 788 C with a thickness of 6.35 mm to a thickness of 0.2 5 mm. However, there is no information about cold or combustible rolling of lanthanum in domestic and foreign literature. As is known, all rare earth metals are characterized by an extraordinary affinity for oxygen; some of them are pyrophoric. Even at Room temperature, they actively interact with the oxygen of the air, and the oxidation process progresses over time and is accompanied by significant losses of expensive and scarce materials. Therefore, ingots and. articles made of most rare earth metals, and, in fairness, CG laegtan is stored under a layer of oil or kerosene. The oxidation rate increases many times with higher temperatures. The active interaction of a metal in these conditions with oxygen can

; lead to fire. Consequently, to ensure normal conduct; the process of hot processing of lanthanum i, eliminating large metal losses and increasing its surface quality, the high-temperature deformation of lanthanum necessary to increase its plasticity, I should be carried out in non-oxidizing conditions, i.e. in vacuum inert environment.

The purpose of the invention is to obtain high: high quality rolled products of lanthanum at high (up to 7 ° C) reduction per pass and: reduction of economic costs during deformation. metal.

Claims (1)

 This is achieved by rolling the lanthanum in a vacuum of 10 - 10 mm Hg. Art. in the temperature range of 550 .650 ° C. This allows to get rolled steel c. good surface quality and virtually no metal loss. ; The selected mode was ETs optimal al-, ny, In vacuum, mm Hg. Art. : Bezokis are created; lit. deformation. Lower . -li vacuum (I mm Hg. Art.) is not both. {{see protection of metal against oxidation 1 ". Rolling at temperatures | ) 1;) does not allow attainment on 1C1Iy | & twylogical plasticity of lanthanum. Heating to temperatures above 650 ° C leads to a decrease in the deforming of the bridge due to excessive grain growth: in the recrystallization process. Rolling is carried out blindly (Pattern. A sample with a thickness of 10 Mm is heated in a furnace of a vacuum rolling mill at 600 C for GO min. Depth of vacuum is 5 U: mm Hg, station Za, the sample is processed in three passes 75% crimping. A strip of 0.8 mm lanthanate is obtained. The sample surface is smooth and glossy, no Mienka oxide and microcracks are observed on it, which indicates the absence of metal loss due to oxidation and its high ductility. lanthanum, vk Including heat and deformation in several passes, so that in order to obtain high-quality rolled metal at high reduction rates per pass, heating and rolling of the metal are carried out in vacuum mm Hg. temperature range 550-650 C.