JPS60151247A - Alkali-free lead borosilicate glass and compoaition containing same as bond for production of abrasive tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an abrasive tool.
g) relating to the field of fabrication, more particularly relating to the fabrication of abrasive tools based on the use of cubic boron nitride and glass bond, and also relating to the field of glass production, more in particular to low linear thermal expansion; The present invention relates to an alkali-free lead borosilicate glass characterized by a high yield.

The present invention can be used in various machine-building industries for the purpose of grinding.
e) and the materials used can be most advantageously used in microelectronics for producing holes and electrically insulating coverings with a low coefficient of linear thermal expansion.

A composition already known for use in the production of abrasive tools contains an abrasive, graphite and glass bond, the components being in the following proportions (1%): Abrasive 10-40 Graphite 12~. A glass pound of 30-78 is taken, and the glass used as the bond has the following composition (
7t;' M % ) IlbO50-75 B203 lo-22 Zn0 10-20 SiO□ 5-8 (see specification of Soviet inventor's certificate No. 325,242 dated October 6, 1970).

The glass prepared as pre-nEI exhibits a high coefficient of linear thermal expansion (70-80 x lO-7dθg-1), which is higher than that of cubic boron nitride (35-40 x lO
'deg), resulting in low mechanical strength of cubic boron nitride-based abrasive tools. The coefficient of linear thermal expansion of the glass is determined by the use of materials characterized by a low coefficient of linear thermal expansion, such as gold foil, for the purpose of obtaining glass and electrically insulating coverings. ,<prevents use in black electronics. Moreover, the graphite formulation in Mae-Yoshimi Abrasive Tool Cement-2 resulted in a reduction of lead oxide present in the glass when the abrasive tool was fired by 3%. This causes a loss in the strength of the tool. As a result, the techniques involved in fabricating abrasive tools from the formulations are quite complex and require temperature conditions of the firing process to be strictly followed.

Another abrasive tool composition known in the prior art contains cubic boron nitride, an abrasive filler and an alkali boroaluminosilicate glass as a binder, with the following proportions of the components: Keidoka Houkaku 36.0-51.0 Abrasive filler
39.5-44.0 Glass bond 9. Q~16.0 ['F;1bor v maehinosshir
oyenii J (Elb in WW Building
Symposium titled The Machinery Bufflinshires, Leningrad, 19
1976, pp. 78-98].

The alkaliboroaluminosilicate glass used in this composition has a coefficient of linear thermal expansion of 53-63xlOdig and does not guarantee a sufficiently strong bond to the cubic boron nitride particles, resulting in increase wear on the top.

The abrasive filler used in the silk lubrication material is J5V corundum, a material whose coefficient of linear thermal expansion is well balanced with the glass bond used in the composition; ) Go AC. Due to the imbalance in bond strength between the glass and the other composition components, the glue cannot be made from material.
1 update is rather problematic.

7i! based on the use of cubic boron nitride! A preferred filler for the fm tool composition is silicon carbide, which has a coefficient of linear thermal expansion that closely matches the thermal extensibility of cubic boron nitride. Silicon carbide also features better abrasive properties than synthetic corundum. However, since the alkali gold h3 oxide contained in glass bond causes oxidation and subsequent deterioration of silicon carbide, silicon carbide, alkali boroaluminosilicate glass and thread 11
They cannot be used together as an abrasive filler.

The following components (1 wound%) SiO340~45 A1□0,10~16 Ca, 02~1.0 BaO3~15 ZnO3~15 B2032~B 5n0□ 0. An alkali-containing lead borosilicate glass containing J~2Pb02~10 St)2030.1~10
It is known in the prior art (see USSR Inventor's Certificate No. 647,269 dated July 2, 1977).

This glass has a low coefficient of linear thermal expansion (44-46x Io-
Moreover, alkali metal oxides were present in this glass at f!(.V), and there were no defects for use with silicon carbide as an abrasive filler. Due to its properties, this glass is used in microelectronics to obtain a seal with silicon metal. However, this glass in powder form is not suitable for use within the temperature range used for firing abrasive tools. 800-1100
It will crystallize violently within the temperature range of 30°F. On top of that,
The viscosity of this glass is such that its fluidity at the firing temperature is 110
], 20%, while good lighting of cubic boron nitride particles by glass (wi
tting) and strong bonding of the glass therein can be achieved with glasses having an R, dynamic of at least 140 degrees.

The foregoing makes the glass unsuitable for use at abrasive tool firing temperatures formulated with cubic boron nitride bases.

The present invention has a viscosity that does not crystallize at abrasive tool firing temperatures and ensures sufficient glass fluidity at said temperatures and a low coefficient of linear thermal expansion close to that of cubic boron nitride and silicon metal, for example. The aim is to provide an alkali-free lead borosilicate glass with a sulfuric acid composition, and further incorporate said glass as a binder and ensure high strength and wear resistance in abrasive tools such as those that can be made therefrom. It is an object of the present invention to provide an abrasive tool composition having a proportion of components.

The purpose is S10□, B2O3, Al2O3, CaO
An alkali-free lead borosilicate glass consisting of 1Bad, ZnO1pbo, MgO and TlO2 is additionally prepared according to the invention with MnO and B20. The proportions of the components are as follows (jumochichi): 810236.0-42.0 B2039.0-11.5 A120313.0-I4.0 PbO24.5-30.0 ZnO3.0-5. 0 Mgo 1.5-2.5 0aOQ, 5-4.0 BaOO, 1-2.0 Tie□0.1-0.5'205 0.1-1.0 Mn00.1-2.0 This is achieved by doing so.

Furthermore, the objective is that an abrasive tool composition consisting of cubic boron nitride, an abrasive filler and a glass bond contains according to the invention a lead borosilicate glass containing the alkali as described above as a binder, The ratio is as follows (wt%)
) cubic boron nitride 37-5J abrasive filler 33-48 glass bond 13-23.

The proposed proportion of glass components is 33-40 X 10
"-71 deg O') linear thermal expansion coefficient and increased ml crystallinity (in powder form) at the abrasive tool firing temperature and said 1
It is ensured that a material is obtained which is characterized by a viscosity that gives a flowability of 140-150%.

Blending MnO into the glass composition according to the present invention increases the crystallization resistance of the glass and lowers the coefficient of linear thermal expansion of the material.

The inclusion of P2O5 in the glass formulation lowers the glass viscosity and thus increases its flowability within the firing temperature range of 800-1100C.

The previous month's selection of boundaries for the glass component content 11 indicates that the crystallization F'iA of the glass changes when the B2O3 content is greater than 11.5% and less than 9%, and the Al2O3 content is 13%.
and increases as the ZnO becomes larger than the 5th factor. If Ayu 203 ↓ 1 is increased to a greater extent than Section 4, it will increase the glass refining temperature. ZnO content is less than 1% (・
1. The contents of IgO, Ca, O, Ba, O and pbo are 2.5%, 4.0%, 2.0% and 30%, respectively.
．． If the linear thermal expansion coefficient is increased to 0 or higher than that of glass, it will have a coefficient of linear thermal expansion that is higher than that of glass.
The content of O and BaO is 1.5% and 0.5%, respectively.
and if the MnO content is increased above 2.0%, the glass will crystallize within the abrasive tool firing temperature range. pbo
If the total content is reduced to less than 24.5%, it will increase the degree of glass softening. When Mn01TiO□ and B2O5 are less than 0.1, the glass is suitable for use as a binder in abrasive tool composites based on the use of cubic boron nitride. Does not show rice activity. TiO2 inclusion is larger than Section 065 (
When C is increased and the r-'2o5 content is increased from +0 to 0, the strength and waxiness deteriorates the technical properties of the glass. S], 02 silk containing 42. (If increased by more than 1%, the glass composition will be higher than 11u).
N) Deaf. When the 5102 content is reduced to 36.0%, the crystallization of glass within the abrasive tool firing temperature range is reduced, and the glass production is reduced to 36.0%. Let's make it higher.

For the bonding of 4f to i-θ) 111, the proposed glass introduction J) ν material was used as a bond in the Sen7nobu H compact j based on cubic neutralized balm γ. Seal and i7 can be effectively used, and when the material t1 is a material having a low coefficient of linear thermal expansion, such as metal silicon,
H, Can be used effectively to obtain Qi insulation prayer items 1)", 3
:(The proposed alkali-free borosilicate glass with a wire heat elongation of ~40 x 1010-7 de' or their Due to the balanced expansion VF3 temperature r!I-1, a high bonding strength between the cubic crystalline hollow particles and the binder and σ) can be achieved, making it possible to create a hole in the tool. degree and increase≠=guarantee wear resistance.

The proposed glass composition has an optimal combination of linear thermal expansion coefficient and viscosity and allows high strength abrasive tools to be manufactured.

The bending strength of the abrasive tool composition is i.
j, 1liiq of 430-450 kp/cm2
400 k for low hardness tools with internal tension,
g/cm2).

The mechanical strength of cubic boron nitride particles coated with a layer of the proposed glass composition is 1.5 to 167 times higher than the mechanical strength of uncoated cubic boron nitride. . The reinforcement of cubic boron grains improves their sharpening properties, thereby making the abrasive tools more resistant to wear.

The use of the proposed alkali-containing lead porosilicate glasses in abrasive tool formulations allows the effective use of not only synthetic corundum but also carbonaceous silicon as an abrasive filler. , thus greatly expanding the field of application for abrasive tools.

The composition components contained within the above limits can be used in a wide range of 7. d4 Abrasive tool force law with vibration).

In the two-piece composition (C), the combination of cubic boron 9ide and an abrasive filler ensures that an abrasive tool with the desired hardness and porosity is obtained. r1 knee 4-
stomach). When the cubic boron nitride content is increased to more than 51%, it makes the grinding cost higher without appreciably increasing the grinding efficiency, while when it is reduced to 37%, it is false. , which reduces the tool performance and also reduces the abrasive filler content by 1.
I'm going to grow up to be a dog from Section 8.

What are the required specifications such that the abrasive filler content is reduced/reduced to less than 33%? iJI machining 5 would require increased cubic boron monoxide content to obtain +1, thus increasing machining cost. Glass bond gold steel is 23DI
) if the glass bond content is decreased to less than 13%, it will cause a decrease in the tool porosity and worsen the heat removal properties in the grinding process; It will not ensure proper bonding of the abrasive grains on the glass.

The following description is a detailed description of the invention.

The proposed glass was prepared using conventional methods in quartz Rubbo.
It was synthesized from ordinary ingredients at f of 380 to 1400°C and Tq of 1 degree.

C) Coefficient of linear thermal expansion of glass (measured using standard 76 method).

Glass flow, T4+j+, was measured as a ratio (%) of the diameter of the tablets measured before firing.

The abrasive tool, according to generally accepted techniques, is applied to the polishing tools described herein.1. Manufactured from +ill composition.

Cubic boron neutralide and abrasive filler powders are mixed together, aged with liquid phenol-formaldehyde resin, and then mixed with glass bond, after which the mixture is molded and heated at a temperature of 800-1100 °C. It was fired in

Performance testing of the abrasive tool made from the proposed composition was carried out by using it under two-silk operating conditions for internal grinding of parts made from ball-bearing chisels (see Table I).

Table I The hardness of the polishing tool is 60 kg using -1N balls.
/Cm2 with a Rockwell tester.

The invention will now be described by specific examples of its embodiments.

Example 1 A formulation for glass preparation consists of the usual starting phase materials, such as quartz, boric acid, albous, lead, magnesium, zinc, titanium and manganese oxides, calcium and barium nitrate and ammonium phosphate, It was based on the following glass composition (manager).

5i02 40.9 A1203 13.7 B2039.8 ZnO4.5 Mgo 2 , 2 CaOL7 BaOO, 5 Pb0 24.5 Mn0 2.0 TiO 13 in the furnace
It was carried out for 2 hours at a temperature of 80-1390°C. The molten glass was fritted. Free throat is 100~
The dried flint was dried at a temperature of 110° C.
Grinded in an abrasive barrel. The ratio of ball to ball was 1:2.

Example 2 The following compositions were prepared to make abrasive tools.

Cubic boron 9ide (125/100) 44 Weight coefficient silicon carbide (80 mcm) 33'@, 9% glass bond (described in Example 1) 23'? I% cubic boron nitride was mixed with silicon carbide and liquid phenol-formaldehyde resin was added at 5% of the abrasive component. The required amount of glass bond powder was added to the mixture thus obtained and the whole was thoroughly mixed. The resulting hole has a diameter of 40 mcm.
sieved through a sieve with The sieved material is put into a mold and pressed into 1, then coarse (r)
aw) The I-shaped object was removed from the mold and 18
It was dried at 0°C. The molded article was then fired.

The humidity increase rate in the firing furnace is 200 and 7 o'clock.
Jy Fuchikame is 1000℃, and when fired)) old +,
It was 3:01.

Table 11C provides the properties of specific glass compositions prepared in accordance with the present invention and nine synthesized glass as detailed in Example 1.

Table 1 gives a specific example of the proposed abrasive tool formulation using the glass of description v as a bonding agent. Table 1
No. 11 also cites the strength properties of abrasive tools obtained from said formulation. The method used to make abrasive tools is
The 'f'L method as described in Example 2.

The consumption rate of cubic boron nitride used as a component of the ωF/:l process produced from the composition according to Examples 3 and 4 (Table 111) and used for internal grinding of ball bearing steel is: ■ 2.3 to 2 when sweeping under silk operating conditions.
6 mg/g, or 0.7-I, Omg/g, for the first case operated under 11 sets of operating conditions (
Heat-resistant ball (Yo 1 cup ground to camp 91).

Table II Table ■ (Continued) Line equal to 33-40 x 10 eLeg for clothes! The proposed alkali-free lead borosilicate glass with an expansion coefficient of 4 can be used as a bond in abrasive tool formulations and
Ensures strong bonding with cubic boron nitride particles and abrasive filler particles, as well as with gold in microelectronics.
It can be used to fry noodles in silicon and can be used to prepare paste-based products.

The proposed abrasive tool formulation incorporating the proposed alkali-free lead borosilicate glass as a bond provides high strength and wear resistance to cubic boron vacuole-based abrasive tools. Pace the proposed composition,
Abrasives can be made with a wide range of hardnesses.

Applicant Shiruto Inomata Kiyoshi

Claims (1)

[Claims] 1, 5in2, B2O3, A1□03, Ca, O, Ba
In the alkali-free lead borosilicate glass containing O1ZnO1pbo, MgO and TiO2, it additionally contains NnO and P2O5, and the proportion of the components is as follows: 42.0 B2039.0-11,5 A1203 13.0-4.0 PbO24,5-30.0 Zn0 3.0-5.0 Mg0 L5-2-5 CaOO,5-4.0 Ba0 0. 1 to 2.0 Tie20, 1 to 0.5 F20. An alkali-free lead borosilicate glass characterized in that it has an alkali content of 0.1 to 10 Mn0 O, 1 to 2.0. 2. In an abrasive tool composition containing cubic boron nitride, an abrasive filler, and a glass bond, the following component ratio (Xi-\t%) Sin□36.0 to 42.
0 B2039+0~11.5 Ayu,,03. 13.0 - 14.0PbO24,
5-30.0 Zn0 3. (1-5,0 MqO1,5-2.5 0aOQ, 5-4.0 I3aO0,1-2.0 Tie□0.1-0.5 B2O50,1-1,0 Mn0 0.1-2. Contains an alkal-free lead borosilicate glass having 0 and 2, and the proportions of the components are as follows (f-fi ratio): Cubic crystal thread ♀
An abrasive tool composition characterized in that: boron 37-51 abrasive filler 33-48 glass pond 13-23.