SU560859A1

SU560859A1 - The mixture for the manufacture of ceramic material

Info

Publication number: SU560859A1
Application number: SU2147137A
Authority: SU
Inventors: Нина Ивановна Бойко; Алексей Иванович Щелоков
Original assignee: Научно-Исследовательский И Проектно-Технологический Институт Электрокерамических Изделий
Priority date: 1975-06-20
Filing date: 1975-06-20
Publication date: 1977-06-05

Description

II

Изобретение относитс к керамическим материалам, примен емым в качестве ду- гостойких и используемым дл изготовлени ду погасительных камер электрических аппаратов.The invention relates to ceramic materials used as ductile and used for the manufacture of extinction chambers of electrical apparatus.

Известна шихта дл изготовлени керамического материала на основе глинозема и огнеупорной глины, примен емого дл изготовлени дугогасительных камер flj. Однако этот материал обладает недостаточной стойкостью к воздействию электрической дуги.The known charge for the manufacture of a ceramic material based on alumina and refractory clay used to make arcing chambers flj. However, this material has insufficient resistance to electric arc.

По составу ингредиентов наиболее близкой к изобретению вл етс шихта, вкпючающа карбид кремни , электрокорунд, глину огнеупорную и ортофосфорную кислоту 2. Материал, изготовленный из шихты данного состава, обладает сравнительно низкой механической прочностью и низкой стойкостью к воздействию электрической дуги. Кроме того, недостаточна пластичность и прочность полуфабриката не позвол ет изготавливать сложные по конфигурации дугогасительные камеры.The composition of ingredients closest to the invention is the charge, which includes silicon carbide, electrocorundum, refractory clay and orthophosphoric acid 2. The material made from the mixture of this composition has a relatively low mechanical strength and low resistance to electric arc. In addition, the lack of ductility and strength of the semi-finished product does not allow the manufacture of arc-shaped chambers of complex configuration.

Целью изобретени вл етс повышение механической прочности и стойкости к воздействию электрической дуги.The aim of the invention is to increase the mechanical strength and resistance to electric arc.

Дл достижени указанной цели шихта, включающа карбид кремни , электрокорунд глину огнеупорную и ортофосфорную кислоту , дополнительно содержит глиносем при следующем соотношении компонентов, вес. % :To achieve this goal, the mixture, including silicon carbide, electrocorundum, refractory clay and orthophosphoric acid, additionally contains alumina in the following ratio of components, wt. %:

Электрокорунд17,5-25Electrocorundum 17,5-25

Глина огнеупорна 20 -30 Ортофосфорна Clay refractory 20 -30 Ortofosforna

кислота10 -15 Глинозем 2,5-18Acid10 -15 Alumina 2.5-18

Карбид кремни Остальное .Silicon carbide Else.

При этом используют карбид кремнии № 8 и электрокорунд № 6.In this case, silicon carbide No. 8 and electrocorundum No. 6 are used.

Claims

To obtain material from a mixture of this composition, raw materials are dry blended in porcelain drums with a material: grinding ratio (uralit balls) of 3: 1 for one hour. Then, the mixture is moistened with orthophosphoric acid and Form 3 V ... at a specific pressing pressure of 600 kgf / cm. Fire samples are burned, for example, in a furnace at a temperature of 1320135 ° C. The static bending strength of a material obtained from a mixture containing 21% of an erect corundum, 30% of refractory clay, 13% of orthophosphoric acid, 14% of alumina and 38% of silicon carbide is 400-500 kgf / cm. Tests for arc resistance of a camera with a narrow slit by twenty combined effects of pulsed current 8 / 2O of the ISS with an amplitude of 10 kA and accompanying current. The average duration of the accompanying current was 5-6 ms, the average amplitude was 240 A. The process of blowing and stretching of the arc proceeds normally, and the destruction of the surface layer of ceramics at the place where the arc stopped is not detected. The increased arc resistance of this material makes it possible to obtain products of higher quality, prolong their service life and ensure more reliable operation of protective electrical apparatus. 59 Claims for the manufacture of a ceramic material for arc arrays and scoop chambers, including silicon carbide, electrocorundum, refractory clay, and orthophosphoric acid, characterized in that, in order to increase mechanical strength and resistance to electric arc, it additionally contains alumina at the following ratio of components, weight ..%: Electrocorundum 17,5-25 Glype refractory 20 -ЗЗ Orthophosphoric acid1О -15 Alumina2-18-18 Silicon carbide Rest Sources of information taken into account during the examination : 1. USSR author's certificate No. 258О91. cl. С О4 В 35 / 1О. 197O.

2. USSR author's certificate 313820, cl. From 04 to 35/56, 197О. M