SU1203043A1 - Compound for protecting metal alloys from oxidation - Google Patents

Description

I

The invention relates to the protection of metals against oxidation and can be used to protect against the oxidation of nickel-molybdenum alloys during their high-temperature heating during heat treatment and before deformation.

The purpose of the invention is to provide protection against oxidation during long-term high-temperature heating of nickel-molybdenum alloys.

Specific compositions of the masses are given in table. one.

The compositions of the frits are presented in table. 2,

The composition of manganese concentrate, eating eaten 5 ivfac. %:

Silicon Oxide 22.0 Iron Oxide Up to 0.2 Manganese Oxide 56.4 Aluminum Oxide 1.4 Titanium Oxide 0.5 Oxide Phosphorus 0.5 Sulfur Anhydride 0.3 Calcium Oxide 9.7 Magnesium Oxide 2.3 Alkali4.7

Pre-frit and manganese concentrate are ground by a dry method to particles less than 0.1 mm, and aluminum powder is degassed by heating to 300-350 ° C and systematic mixing.

The preparation of the compositions is as follows.

Estimated quantities of pre-shredded glass frit030432

You and manganese concentrate are mixed in a ball mill with a calculated amount of liquid glass and water, and in the case of preparing the proposed composition, an additional amount of chromium oxide and aluminum powder is added. Then, in both cases, the compositions are mixed for 30 minutes until a stable 10 suspension is obtained.

In order to preserve the consistency of the slip, which provides it with a standstill, the total content of dry components should be in the range of 63-72%.

The prepared compositions are applied by dipping on the surface of samples preliminarily degreased with magnesium oxide from EP-814 alloy

20 20 40 -.5 mm and dry them at 100 ° C. After this, the specimens are visually inspected to determine the condition of the coating. Then the samples on fireclay stands placed in. bake

2 for high temperature heating to 1240 ° C for 1 hour. Thereafter, they are removed from the furnace and cooled in air. I

All the proposed formulations form a uniform continuous layer before firing, and after firing they form an excellent shiny coating, there is no scale under the coating, the state of the metal surface is satisfactory.

Table 1

1.0 1.0 1.0 1.3 1.5

Editor N. Gunko

Compiled by S. Belobokova

Tehred L. Mikyosh Corrector M. Maksimishinets

Order 8579 Circulation 456 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PIP Patent, Uzhgorod, st. Project, 4

The continuation of the table.1.

table 2

Claims (1)

MASS FOR PROTECTION AGAINST OXIDATION OF METAL ALLOYS, including a frit containing, wt.%: SiO _z 52.5-53.5, B ₂ 0, 9.5-10.5; AT ₂ 0 _? 14.5-15.5 ', CaO 16.6-17.4 MgO 3.6-4.4; Na _z 0 0.1-0.6; Fe _z 0 _? 0, ΙΟ, 4, manganese concentrate, water glass and water, distinguish από in that, in order to provide protection against oxidation during prolonged high-temperature heating of nickel-molybdenum alloys, it additionally contains chromium oxide and aluminum powder in the following ratio of components, wt .%: Frit, indicated Nai higher Manganese concentrate 48.5-53.5 2.5-7.5 sg Liquid glass 9.3-12.3 ω Chromium oxide 5-15 Aluminum t— powder 1-2 Water Rest z *. N- »Η * £ o f >