SU563006A1 - Diamond-abrasive composition for polishing borate glass - Google Patents

Description

one

The invention relates to the machining of glass and can be used in optical-mechanical industry in borate glass processing.

Abrasive compositions for polishing borate glasses are known, which are aqueous suspensions of zirconium dioxide with the addition of basic zirconium sulfate 1 and polishing powders: polyrite, cerium oxide, chromium oxide, iron oxide (crocus) and diamond AFM 1-O 2.

Polishing with known compositions of borate glasses, especially at the initial stage, is accompanied by the appearance of "sticking of the surface layer of a polishing rod to glass, which makes it difficult to obtain a high-quality surface of the optical components being processed.

The purpose of the invention is to obtain high-quality surfaces of optical components made of STK borate glasses with high polishing performance.

This is achieved by the fact that the polishing abrasive composition contains sulfuric acid and distilled water as a liquid medium, in the following ratio of components, weight. %:

Synthetic Diamond Micropowder8-12

Sulfuric acid solution 0.5-1.0

Distilled water Else As a synthetic diamond micropowder, you can use the micropowder brand AFM 1-0.5.

The effect of a 0.5-1% solution of sulfuric acid, used as a liquid medium of a diamond-abrasive suspension when polishing borate glasses, is

as follows: upon contact with an aqueous medium in the process of polishing on the surface of borate glasses of the type STK containing up to 70% of oxides of boron and lanthanum, hydrolysis occurs with the formation of boron

acid and lanthanum hydroxide. The readily soluble boric acid is removed from the surface of the glass, passing into the aqueous medium of the suspension. Lanthanum hydroxide remains on the surface to be treated and due to

its partial solubility interacts with rosin acids, which are the main component of pen-resin resin, to form insoluble rosin soaps.

Sulfuric acid, used as the liquid medium of the diamond-abrasive polishing slurry, reacts with the lanthanum hydroxide formed during surface hydrolysis of borate glasses, thereby preventing the formation of rosin soaps. in case of sulfuric acid in the process of polishing on the surface of the glass - ha) actor gray palet.

When the concentration of sulfuric acid is less than 0.5%, the removal of glass hydrolysis products from the treated surface is slowed down, as the mixture1 of unreacted lanthanum hydroxide and rosin soaps, which form the nrn interaction of lanthanum hydroxide with rosin acids, remains on the surface.

When copentranni sulfuric acid more than 1% is the destruction of polished

Content,

Components weight. % Synthetic al.mazn1) i1 micro and powder AFM 1-0 Sulfuric acid Distilled water C | I1gethe || th diamond micr and powder AFM 1-0,5 Sulfuric acid Distilled water Synthetic al.chasny microscopic ASL1 1 - 1,05 Sulfur acid / (distilled water Synthet || CHeS1S11Y diamond micro powder ACAi 1–0.5 (true acid Distilled water Synthetic diamond1) I1 oron ACM 1 0.5 Seria acid / Purified water

The surface of the orate stockpiles, as in this case, the excess sulfuric acid reacts directly with lanthanum oxide, which is part of the borate glasses.

Therefore, a 0.5-1% solution of sulfuric acid in distilled water is also optimal.

The table shows the proposed al. Mazio-abrasive compositions, and the characteristics of the machining of borate glasses with these compositions.

Time, polished quality of polished vanilla, min of internal quality corresponds to class II, according to GOST 11141 05, the surface is optically clean. The quality corresponds to class II but GOST 11145-65 surface is ontic clean. The quality corresponds to the class IO GOST 11141-65 surface optically clean. The quality corresponds to class 110 and GOST 11141-G5. No damage to surface II

The proposed polishing composition has the following benefits: the quality of the polished surface of STK borate glass has increased to Class II according to GOST 11141-65; The gray surface of the treated surface does not form a gray pallet, as a result of which there is no phenomenon of "adding even to the initial polishing stage; the diamond micromolecule in a 0.5-1% solution of sulfuric acid does not form and damage to glass, which is explained by the enhancement of physical and chemical processes during polishing of borate glasses; the polishing time of STK borate glasses was drastically reduced compared to the treatment with known compositions. The use of a 0.5-1% solution of sulfuric acid as a liquid medium of a diamond abrasive suspension increases the rate of polishing of borate glasses of the type STK by a factor of 3.5–5 compared with treatment with a diamond micropowder in pure water and 6–9 times with respect to polyrite processing speed. An additional step is excluded - final grinding with M10 microcorundum powder on a peicotrophic resin.

Claims (3)

Invention Formula A diamond-abrasive polishing compound for borate glasses, including a polishing agent — synthetic diamond micropowder and a liquid medium, is distinguished by the fact that, in order to obtain high-quality surfaces and to ensure high polishing performance, it contains sulfuric acid as a liquid medium and distilled water, in the following ratio of components, weight. %: Synthetic diamond micropowder8-12 Sulfuric acid0.5-1.0 Distilled water Else Sources of information taken into account during the examination 1. T. P. Yakovleva, L. V. Chunova, A. Kovalenko, F, Bel, V. V. OMP No. 1, 1974, p. 50. 2. Puppet 3. A. OMP number 4, 1974, p. 42