KR100262695B1 - Method for producing high strength glass bead for dispersion - Google Patents
Method for producing high strength glass bead for dispersion Download PDFInfo
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- KR100262695B1 KR100262695B1 KR1019970037768A KR19970037768A KR100262695B1 KR 100262695 B1 KR100262695 B1 KR 100262695B1 KR 1019970037768 A KR1019970037768 A KR 1019970037768A KR 19970037768 A KR19970037768 A KR 19970037768A KR 100262695 B1 KR100262695 B1 KR 100262695B1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/006—Re-forming shaped glass by fusing, e.g. for flame sealing
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C12/00—Powdered glass; Bead compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
Abstract
Description
본 발명은 분산(分散)용 유리알을 제조하는 데 특히 적합한 조성을 갖는 유리 및 그를 이용한 분산용 고강도 유리알 제조 방법에 관한 것이다.The present invention relates to a glass having a composition which is particularly suitable for producing glass beads for dispersion and a method for producing high strength glass beads for dispersion using the same.
구상(球狀)의 유리알은 직경 수㎛에서 수mm로 형성되어, 직경이 약 1mm이하의 것은 도로표지용으로 사용되고, 직경 1mm~5mm의 것은 페인트, 잉크, 자기테이프, 약품, 식품 등을 만드는 공정에서 분체를 고점도의 액체에 균질하게 분산시키기 위한 분산용 메디아로 사용된다.Spherical glass pellets are formed from several micrometers in diameter to several millimeters in diameter, with diameters of less than about 1mm used for road marking, and those with diameters of 1mm to 5mm for making paints, inks, magnetic tapes, chemicals, foods, etc. In the process, it is used as a dispersion medium for homogeneously dispersing the powder in a high viscosity liquid.
분산용 유리알은 분산밀(Dispersion Mill)의 베셀(Vessel)내에서 고속으로 회전하는 디스크에 의해 충격력과 전단력을 받기 때문에 내마모성 및 내충격성이 특히 요구되며, 경우에 따라서는 특정의 화학성분이 배제되어야 하기도 한다.Dispersion glass pellets are particularly required for wear resistance and impact resistance because they are impacted and sheared by a disk rotating at high speed in a Vessel of a Dispersion Mill. Sometimes.
이와 같은 분산용 유리알은 적절한 크기로 분쇄된 유리입자와 탄소분을 혼합한 후, 유리의 연화점 부근까지 가열하여 유리의 표면장력에 의해 구상화시킴으로서 제조된다. 본래 유리파쇄물은 연화온도 부근까지 가열되면 표면장력에 의해 예각이 없어지고 구형이 되려는 경향이 있지만 자중이나 연화된 유리입자끼리의 부착에 의해 구형화가 방해된다. 탄소는 유리와의 젖음성(wettability)이 가장 나쁘기 때문에 젖음성이 나쁜 탄소분과 유리파쇄물의 혼합물을 연화점 부근까지 가열하므로서 구형으로의 성형이 가능하게 된다. 구형화된 유리의 표면에 생성된 탄소막은 약불산등으로 세척하여 제거하게 된다.Such glass grains for dispersing are prepared by mixing glass particles pulverized to an appropriate size and carbon powder, and heating them to the vicinity of the softening point of the glass to spheroidize by the surface tension of the glass. When glass fragments are heated to near the softening temperature, they tend to lose their acute angle due to surface tension and become spherical, but sphericalization is prevented by self-weighting or attachment of softened glass particles. Since carbon has the worst wettability with glass, it becomes possible to shape | mold to a spherical shape by heating the mixture of the carbon component and glass crushed product with poor wettability to the vicinity of a softening point. Carbon film formed on the surface of the spherical glass is removed by washing with weak hydrofluoric acid.
상기와 같은 공정에 의해 구상화되어 제조되는 분산용 유리알은 전술한 바와같이 내마모성 및 내충격성이 특히 요구되나, 종래의 분산용 유리알은 비정질(非晶質) 구조를 갖고 있기 때문에, 그 화학조성을 단순 변화시킨다 하더라도, 내마모성이나 내충격성과 같은 기계적 물성의 향상을 기대하기는 어려웠다.Dispersion glass grains prepared by the above-described process are particularly required to have abrasion resistance and impact resistance as described above. However, since conventional dispersion glass grains have an amorphous structure, the chemical composition is simply changed. Even if it was made, it was difficult to expect improvement of mechanical properties such as wear resistance and impact resistance.
현재 가장 많이 사용되고 있는 소다석회유리로 만든 유리알, 장섬유용 E-glass로 만든 유리알, 이화학용 붕규산유리로 만든 유리알의 경도는 각각 547kgf/㎟, 580kgf/㎟, 560 kgf/㎟, 마모도는 각각 4.47%, 3.06%, 3.48%로, 화학조성의 차이에도 불구하고 그 기계적 물성에 큰 차이가 없는 것을 알 수 있으며, 저급용 자기 테이프나 페인트 제조용에만 용도가 한정되고 있는 실정이다.The glass balls made of soda-lime glass, glass balls made of long-fiber E-glass, and glass balls made of borosilicate glass for chemistry are respectively 547kgf / mm2, 580kgf / mm2, 560kgf / mm2, and wear levels are 4.47. %, 3.06%, 3.48%, despite the difference in chemical composition, it can be seen that there is no significant difference in the mechanical properties, the use is limited to the manufacture of low-grade magnetic tape or paint.
여기에서, 경도는 누프 경도값이며, 마모도는 샌드밀을 사용하여 유리알 500g, 탄소규소 #1000(16㎛) 5g, 증류수 300ml, 디스크 회전속도 650rpm, 회전시간 5시간의 조건에서 실험한 후, 마모감량을 측정한 것을 나타낸다.Here, the hardness is the Knoop hardness value, and the wear degree is tested by using a sand mill at the conditions of 500g of glass grains, 5g of silicon silicon # 1000 (16㎛), 300ml of distilled water, disk rotation speed 650rpm, rotation time 5hours, It indicates that the weight loss is measured.
한편, 유리의 조성변화 없이 후처리에 의해 유리의 기계적 물성을 증진시키는 방법이 있는 바, 그 대표적인 것으로 급랭법과 이온교환법이 있다.On the other hand, there is a method of improving the mechanical properties of the glass by the post-treatment without changing the composition of the glass, the typical examples are the quenching method and the ion exchange method.
급랭법이란 유리를 일정온도 이상으로 가열한 후 급격히 냉각시키므로서 유리표면에 잔류압축응력을 발생시켜 강도를 증진시키는 방법이다. 이 방법은 유리의 형상과 두께에 제한이 있고, 이렇게 처리된 유리가 파괴될 때에는 아주 작은 조각으로 전파(全破)되기 때문에 분산용 유리알 제조에는 적합하지 않다.The quenching method is a method of increasing the strength by generating residual compressive stress on the glass surface by rapidly cooling the glass after heating it to a predetermined temperature or more. This method has limitations on the shape and thickness of the glass, and is not suitable for dispersing glass grains because the glass thus treated propagates into very small pieces.
이온교환에 의한 강도 증진법은 특정 성분의 알칼리 용융조에 장시간 유리를 담가 놓으므로서 유리내부의 알칼리 성분과 용융조의 알칼리 성분(유리내부의 알칼리와는 다른 종류)이 자리를 바꿈으로서 표면에 아주 얇은 이온교환층이 생기고, 이. 층에 압축응력이 발생되어 강도가 증진되는 방법이다. 이 방법도 강도증진에는 효과가 있지만, 내마모성이 좋지 않아 분산용 유리알의 제조에 사용하면 표면이 서서히 마모되므로 분산용 용도에는 역시 적합하지 않다.The method of increasing the strength by ion exchange involves immersing the glass in the alkali melting tank of a certain component for a long time, thereby changing the alkali component inside the glass and the alkali component (different from the alkali inside the glass) of the melting tank, thereby making very thin ions on the surface. Exchange layer is formed, The compressive stress is generated in the layer to increase the strength. This method is effective in increasing strength, but is not suitable for dispersing applications because the surface is gradually worn out when used in the production of dispersing glass beads due to poor wear resistance.
따라서, 최근에는 분산용 유리알의 대용품으로 지르코니아질의 세라믹 구슬을 제조·사용하고 있지만, 고가이기 때문에 특정분야에서만 사용되고 있다.Therefore, in recent years, zirconia-based ceramic beads are manufactured and used as a substitute for dispersing glass beads, but are only used in specific fields because they are expensive.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 구상 성형성을 그대로 유지하면서도 결정화에 의해 내마모성 및 내충격성을 향상시킬 수 있는 조성을 갖는 분산용 유리알 제조용 유리를 제공함으로서, 저렴한 가격 분산용 고강도 결정화 유리알을 제조할 수 있도록 하는 데 그 목적이 있다.The present invention is to solve the above problems, by providing a glass for dispensing glass grains having a composition that can improve the wear resistance and impact resistance by crystallization while maintaining the spherical formability, high-strength crystallized glass beads for low price dispersion The purpose is to be able to manufacture.
본 발명의 또 다른 목적은, 본 발명에 따른 분산용 유리알 제조용 유리를 사용하여 분산용 고강도 결정화 유리알을 제조함에 있어서, 결정화도를 최대로 함으로서 내마모성 및 강도를 최대한 향상시킬 수 있는 고강도 결정화 유리알 제조방법을 제공하는 데 있다.Still another object of the present invention is to prepare a high-strength crystallized glass grain for dispersing using the glass-dispersion glass preparation for dispersing according to the present invention. To provide.
상기의 목적을 달성하기 위한 본 발명에 따른 분산용 고강도 결정화 유리알 제조용 유리는, 그 조성성분이, SiO232~63중량%, B2O34~18중량%, MgO와 CaO중 적어도 어느 한 성분 8~24중량%, Al2O38~24중량%, Na2O와 K2O중 적어도 어느 한 성분 4~23중량%, ZrO22~13중량%로 이루어지는 것을 특징으로 한다.The glass for producing the high-strength crystallized glass grains for dispersion according to the present invention for achieving the above object has a composition component of 32 to 63% by weight of SiO 2 , 4 to 18% by weight of B 2 O 3 , and at least one of MgO and CaO. It is characterized by consisting of 8 to 24% by weight of the component, 8 to 24% by weight of Al 2 O 3 , 4 to 23% by weight of at least one of Na 2 O and K 2 O, and 2 to 13% by weight of ZrO 2 .
일반적으로, 유리는 장시간 가열하면 비정질 상태에서 결정질 상태로 바뀌는데, 현재 상용화 되어 있는 판유리 등을 가열하여 결정질 상태로 만들려면 장시간의 가열이 필요하고, 이때 생기는 결정은 이질화 결정이기 때문에 강도 증간에는 기여하지 못한다. 본 발명에 따른 조성을 갖는 분산용 고강도 결정화 유리알 제조용 유리는 구상화와 동시에 유리의 결정화가 용이하게 이루어질 수 있으므로, 제조되는 유리알의 내마모도 및 내충격성이 현격히 향상된다.In general, the glass is changed from the amorphous state to the crystalline state when heated for a long time, but heating the currently commercialized plate glass, etc. to make the crystalline state requires a long time heating, and the crystals produced at this time do not contribute to the increase in strength because can not do it. Since the glass for producing a high-strength crystallized glass grain for dispersion having a composition according to the present invention can be easily crystallized and crystallized at the same time, the wear resistance and impact resistance of the glass grain to be produced are significantly improved.
또한, 본 발명에 따른 고강도 결정화 유리알 제조방법은, 상기한 조성을 갖는 유리를 사용하여 분산용 고강도 결정화 유리알을 제조하는 방법에 있어서, 상기 유리를 파쇄하는 단계와; 상기 파쇄 유리를 탄소분과 혼합하여 870℃ 내지 970℃로 열처리하여 결정화 및 구형화시키는 단계와; 상기 열처리된 구형 유리를 860℃ 내지 900℃에서 30분 내지 2시간동안 재열처리하여 결정화도를 높이는 단계;를 구비하여 결정화도를 약 80%까지 향상시키는 것을 특징으로 한다.In addition, the high-strength crystallized glass grains manufacturing method according to the present invention, the method for producing a high-strength crystallized glass grains for dispersion using the glass having the above composition, the step of crushing the glass; Mixing the crushed glass with carbon powder and subjecting the mixture to heat treatment at 870 ° C. to 970 ° C. to crystallize and form a sphere; Reheating the heat-treated spherical glass at 860 ℃ to 900 ℃ for 30 minutes to 2 hours to increase the crystallinity; and characterized in that to improve the crystallinity up to about 80%.
이하 실시예를 통하여 본 발명을 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail through examples.
[실시예 1]Example 1
SiO243.7중량%, B2O314.6중량%, MgO 14.6중량%, Al2O314.6중량%, Na2O 7.7중량%, ZrO24.8중량%, 화학조성을 갖는 유리를 제조하였다. SiO2는 SiO2를, MgO는 4MgCO3·Mg(OH)2·5H2O를, Al2O3는 Al(OH)3를, Na2O는 NaCO3를, ZrO2는 ZrO2를, B2O3는 B2O3를 출발원료로 하였다. 출발원료를 칭량하고 모르타르 등을 이용하여 잘 혼합한 후 알루미나 도가니 혹은 백금 도가니에 담아 전기로에 넣고 약1500℃로 가열하여 용융시킨 후 용융물을 흑연판에 부어 투명한 유리를 만든다. 이 유리는 수십회의 실험을 통하여 찾아낸 조성의 유리로서, 유리화가 잘 되고 연화점 부근의 온도로 가열했을 때, 결정화도 잘 되는 조성의 유리이다. 용융된 유리를 4mm~5mm 크기로 파쇄한 후 유리파쇄물 50g과 탄소분말 50g을 잘 혼합하여 알루미나 도가니에 담아 박스형 전기로에 넣고 약 890℃에서 30분간 가열하여 구형의 결정화된 불투명 흰색 유리알을 제조하였다.43.7 wt% SiO 2 , 14.6 wt% B 2 O 3, 14.6 wt% MgO, 14.6 wt% Al 2 O 3 , 7.7 wt% Na 2 O, 4.8 wt% ZrO 2 , and a glass having a chemical composition were prepared. SiO 2 is SiO 2 , MgO is 4MgCO 3 · Mg (OH) 2 · 5H 2 O, Al 2 O 3 is Al (OH) 3 , Na 2 O is NaCO 3 , ZrO 2 is ZrO 2 , B 2 O 3 used B 2 O 3 as a starting material. The starting materials are weighed and mixed well using mortar, etc., put in an alumina crucible or platinum crucible, placed in an electric furnace, heated to about 1500 ° C, and melted. Then, the melt is poured on a graphite plate to form a transparent glass. This glass is a glass having a composition found through dozens of experiments, and is a glass having a composition that is well vitrified and crystallized when heated to a temperature near the softening point. After crushing the molten glass to 4mm ~ 5mm size, 50g glass crushed and 50g of carbon powder was mixed well, put in an alumina crucible, put into a box-type electric furnace and heated at about 890 ℃ for 30 minutes to prepare a spherical crystallized opaque white glass.
참고적으로, 유리의 연화점이란 유리점도가 4.5×107poise인 온도를 말하는 바, 유리조성에 따라 상이하다. 이 정도의 온도가 되면 결정화될 수 있는 유리는 쉽게 결정화가 일어난다. 즉, 유리파쇄물을 약 890℃에서 30분간 열처리를 하므로서 유리를 구형으로 만듬과 동시에 결정화를 시킬 수 있었다. 이렇게 제조된 결정화 유리알은 경도 630kgf/㎟, 마모도 2.7%, 압축강도 30N/㎟의 물성을 나타냈으며, 석출된 결정은 포스테라이트(MgO·SiO2)와 바델라이트(ZrO2) 결정이었다. 압축강도는 압축강도시험기로 1mm/min의 속도로 압력을 가하였을 때의 파괴하중을 측정하여 이것을 유리알 단면적으로 나누어 구한 값이다.For reference, the softening point of glass refers to a temperature at which the glass viscosity is 4.5 × 10 7 poise, which varies depending on the glass composition. At this temperature, the glass that can crystallize easily crystallizes. That is, the glass fragments were heat-treated at about 890 ° C. for 30 minutes, thereby making the glass spherical and crystallizing at the same time. The crystallized glass grains thus prepared exhibited physical properties of hardness 630 kgf / mm 2, wear level 2.7%, and compressive strength 30 N / mm 2, and the precipitated crystals were forsterite (MgO · SiO 2 ) and badelite (ZrO 2 ) crystals. Compressive strength is a value obtained by measuring the breaking load when a pressure is applied at a speed of 1 mm / min with a compressive strength tester and dividing it by the glass ball cross section.
이와 같이 제조된 결정화 유리는 유리를 가열하여 결정화된 상태로 만든 것이기 때문에 100% 결정질만 있는 상태가 아니고, 유리질과 결정질이 혼재하고 있는 상태이다. 결정질의 량은 열처리 온도와 시간에 의존하고, 또한 물성은 결정질량에 의존한다. 결정질의 량을 결정화도(結晶化度)라고 하는데, 위의 방법으로 제조된 결정화 유리알의 결정화도는 약 30%이다.Since the crystallized glass produced in this way was made into a crystallized state by heating the glass, the crystallized glass is not a state in which only 100% crystalline is present, but a state in which glass and crystalline are mixed. The amount of crystalline depends on the heat treatment temperature and time, and the physical properties also depend on the crystalline mass. The amount of crystalline is called crystallinity, and the crystallinity of the crystallized glass grains produced by the above method is about 30%.
[실시예 2]Example 2
SiO244.5중량%, B2O34.9중량%, MgO 17.9중량%, Al2O317.9중량%, Na2O 9.9중량%, ZrO24.9중량% 화학조성의 유리를 위의 제1실시예와 같은 방법으로 제조하였다. 제조된 유리를 4~5mm 크기로 파쇄한 후 유리파쇄물 100중량부에 탄소분 10중량부 비율로 혼합 한 후 로타리킬른을 통과 시키므로서 구형으로의 성형과 결정화가 동시에 일어나게 하였다. 로타리킬른이란 파이프형의 로가 회전될 수 있도록 만들어진 것으로 피가열물을 고르게 가열할 수 있고, 연속 생산이 가능한 장점을 갖고 있다. 이때의 제조조건은 온도 약 900℃, 회전속도 30rpm, 경사각도 4°이었다. 이렇게 하여 제조된 결정화 유리알의 물성도 위의 제1실시예에서 제조된 것과 비슷한 물성으로 625kgf/㎟, 마모도 2.9%, 압축강도 30N/㎟을 나타냈다. 다만 로타리킬른을 사용하였으므로 제조시간이 짧았고 연속제조가 가능하였다.44.5 wt% SiO 2 , 4.9 wt% B 2 O 3 , 17.9 wt% MgO, 17.9 wt% Al 2 O 3 , 9.9 wt% Na 2 O, 4.9 wt% ZrO 2. It was prepared in the same manner. After the prepared glass was crushed into 4 ~ 5mm size and mixed with 100 parts by weight of the carbon crushed to 10 parts by weight of carbon fraction and then passed through a rotary kiln, forming and crystallization into a spherical shape occurred simultaneously. Rotary kiln is designed to rotate the pipe-type furnace, and it has the advantage of being able to heat the heated object evenly and continuous production. The manufacturing conditions at this time were a temperature of about 900 ℃, rotation speed 30rpm, tilt angle 4 °. The physical properties of the crystallized glass grains thus prepared were 625 kgf / mm 2, abrasion of 2.9%, and a compressive strength of 30 N / mm 2 with similar properties to those of the first embodiment. However, the rotary kiln used a short manufacturing time and continuous manufacturing was possible.
[실시예 3]Example 3
SiO243.3중량%, B2O310.1중량%, MgO 16.2중량%, Al2O316.2중량%, Na2O 9.1중량%, ZrO 5.1중량% 화학조성의 유리를 위의 실시예 1와 같은 방법으로 제조하여, 위의 실시예 2에서와 같은 조건(온도 약 900℃, 회전속도 300rpm, 경사각 4°)으로 로타리킬른을 이용하여 성형과 결정화를 하였다. 이때의 물성은 620kgf/㎟, 마모도 2.8%, 압축강도 30N/㎟이었다. 물성을 더욱 증진시키기 위해서는 결정화도를 높이면 되는데, 이를 위해서 로타리킬른을 통과하여 나온 결정화 유리알을 다시 알루미나 도가니에 담아 880℃에서 2시간 동안 가열하였다. 이와같이 2차 열처리를 하므로서 경도는 670kgf/㎟, 마모도는 2.1%, 압축강도는 35N/㎟로 물성증진이 이루어졌다. 이는 결정질의 양이 늘어났기 때문인데, X-선회절법에 의한 결정화도 측정결과 약2차 열처리를 한 경우 결정화도는 약80%, 2차 열처리를 안하였을 경우 약 30%였다.43.3 wt% SiO 2 , 10.1 wt% B 2 O 3 , 16.2 wt% MgO, 16.2 wt% Al 2 O 3 , 9.1 wt% Na 2 O, 5.1 wt% ZrO glass, the same as in Example 1 above. It was prepared by the method, and molding and crystallization using a rotary kiln under the same conditions as in Example 2 (temperature about 900 ℃, rotation speed 300rpm, inclination angle 4 °). The physical properties at this time were 620kgf / mm 2, wear rate 2.8%, and compressive strength 30N / mm 2. In order to further improve the physical properties, the degree of crystallization may be increased. For this purpose, the crystallized glass pellets passed through the rotary kiln were placed in an alumina crucible and heated at 880 ° C. for 2 hours. As a result of the secondary heat treatment, the hardness was improved to 670kgf / mm2, the abrasion was 2.1%, and the compressive strength was 35N / mm2. This was due to the increased amount of crystallinity. The crystallinity was about 80% when the secondary heat treatment was performed and about 30% when the secondary heat treatment was not performed.
상기와 같이 구성되는 본 발명에 따른 분산용 고강도 결정화 유리알 제조용 유리 및 그를 이용한 고강도 결정화 유리알 제조방법에 의하면, 구상화와 동시에 유리의 결정화가 용이하게 이루어질 수 있으므로, 제조되는 유리알의 내마모도 및 내충격성을 효과적으로 향상시킬 수 있게 되며, 따라서, 고정도 자기 테이프나 약품등의 분산용 메디아로 사용되는 고가의 지르코니아질 세라믹 구슬을 대체할 수 있게 되므로 그 생산 원가를 현격히 낮출 수 있게 된다.According to the glass for producing high-strength crystallized glass grains for dispersion and the high-strength crystallized glass grains manufacturing method using the same according to the present invention configured as described above, crystallization of the glass can be easily performed simultaneously with the spheroidization, and thus the wear resistance and impact resistance of the glass grains produced are effectively As a result, it is possible to replace expensive zirconia-based ceramic beads used as high-definition magnetic tapes or medicines for dispersing media, so that the production cost can be significantly reduced.
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