KR900007425B1 - Mn-zn ferrite singlecrystal manufacturing method for ctr head - Google Patents

Mn-zn ferrite singlecrystal manufacturing method for ctr head Download PDF

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KR900007425B1
KR900007425B1 KR1019860010671A KR860010671A KR900007425B1 KR 900007425 B1 KR900007425 B1 KR 900007425B1 KR 1019860010671 A KR1019860010671 A KR 1019860010671A KR 860010671 A KR860010671 A KR 860010671A KR 900007425 B1 KR900007425 B1 KR 900007425B1
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single crystal
head
ferrite
manufacturing
mole
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KR1019860010671A
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KR880008239A (en
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조긍연
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삼성전자 주식회사
한형수
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/133—Structure or manufacture of heads, e.g. inductive with cores composed of particles, e.g. with dust cores, with ferrite cores with cores composed of isolated magnetic particles

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  • Manufacturing & Machinery (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

A method for mfg. a Mn-Zn ferrite single crystal for a VTR head comprises mixing 48058 mole % Fe2O3, 23-25 mole % MnO and 13-25 mole % ZnO with a pure water (wt. ratio of 1:1), plasticizing the mixt. at 1200-1300 deg.C for 8hr, and crystallizing the mixt. under the O2 atmosphere of the single crystal growth furnace.

Description

VTR 헤드용 Mn-Zn 페라이트 단결정의 제조방법Manufacturing method of Mn-Zn ferrite single crystal for VTR head

제1도는 본 발명에서 사용되는 단결정 성장로와 온도구배 표시도.1 is a diagram showing a single crystal growth furnace and a temperature gradient used in the present invention.

제2도는 본 발명의 제조공정도.2 is a manufacturing process diagram of the present invention.

제3도는 본 발명의 1실시예에 의한 잉고트(ingot)의 길이에 따른 각 구성원료의 함량의 변화상태도.3 is a state diagram of the change in the content of each member according to the length of the ingot (ingot) according to an embodiment of the present invention.

제4도는 본 발명의 주파수와 투자율의 관계도.4 is a relationship between frequency and permeability of the present invention.

제5도는 본 발명의 투자율 측정에 사용된 시편.5 is a test piece used to measure the permeability of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 가스인입구 2 : 성장로본체1: gas inlet 2: growth furnace body

3 : 도가니구동장치 4 : 온도구배3: crucible driving device 4: temperature gradient

5 : 도가니5: crucible

본 발명은 비데오 헤드의 소재로서 영상신호의 고주파 대역에서 투자율이 높고, 포화자속밀도가 높은 우수한 특성을 가진 VTR 헤드용 Mn-Zn 페라이트 단결정 제조방법에 관한것이다.The present invention relates to a method for producing Mn-Zn ferrite single crystal for a VTR head having high permeability and high saturation magnetic flux density in a high frequency band of a video signal as a material of a video head.

종래의 경우, 비데오 헤드의 소재로서 여러형태의 소재를 사용하여 왔으나 비데오 헤드로서의 소재가 갖춰야할 물성으로서, 영상신호를 재생시키거나 기록시키기 위해 고주파(5MHZ) 대역에서 재료의 투자율이 커야한다.In the related art, various types of materials have been used as materials of a video head, but materials having a material of a video head are required to have high magnetic permeability in a high frequency (5MHZ) band in order to reproduce or record a video signal.

ㅇ테이프에 기록시키기 위해서는 헤드의 포화자속밀도(Bs) 또는 포화자화(Ms)가 커야한다.The saturation magnetic flux density (Bs) or saturation magnetization (Ms) of the head must be large for recording on the tape.

ㅇ고주파대역에서 전기적 손실을 줄이기 위해서 전기저항이 커야한다.ㅇ In order to reduce electrical loss in high frequency band, the electrical resistance should be large.

ㅇ헤드의 잔류자화를 줄이기 위해서 헤드의 보자력(Hc)이 작아야 한다.The coercive force (Hc) of the head should be small to reduce the residual magnetization of the head.

o 내마모성 및 가공성이 좋아야한다.o Good wear resistance and processability

이와같은 특성을 지녀야만 비데오 헤드로서의 기능을 다할 수 있으나 센서스트(Sendust) 합금계 등의 종래의 소재는 특성을 만족시키는데 한계가 있는 결점이 있었다.Only having such characteristics can perform a function as a video head, but conventional materials such as a sensor alloy (Sendust) -based alloys had a disadvantage in that there is a limit in satisfying the characteristics.

따라서 본 발명은 이와같은 결점을 해소시키면서 비데오 헤드로서의 지녀야할 특성을 갖게하기 위해 새로운 소재의 제조방법으로써 그 실시예를 통하여 상세히 설명하면 다음과 같다.Therefore, the present invention will be described in detail through the embodiment as a method of manufacturing a new material in order to solve such a defect and to have a characteristic to have as a video head.

실시예Example

제1도에서 보는 바와같은 단결정 성장할 수 있도록한 적당한 온도구배를 가질수 있도록 정밀한 온도까지 조절 가능하게 가스인입구(1)가 형성된 성장로 본체(2), 도가니 구동장치(3)를 설계 제작한것으로 성장로의 분위기를 가스인입구(1)를 통해 조절하여 도시된 온도구배(4)를 가질 수 있게하여 단결정 성장시킬 수 있게된 설비로서 제2도에서 보는 바와같은 제조공정도에 따라 원하는 화학조성에 맞게 Fe2O3, MnCO3, ZnO를 정확하게 계량(計量) : weighing)한 원료를 볼밀(Ball Mill)에서 완전 혼합되도록 혼합 및 파쇄하여 이때 순수와 원료를 1 : 1의 비율정도로 혼합된 상태에서 실시한다.As shown in FIG. 1, the growth furnace in which the gas inlet 1 is formed to control the temperature precisely so as to have a proper temperature gradient for single crystal growth as shown in FIG. 1 is designed and manufactured by the main body 2 and the crucible driving device 3. It is a facility that can control the atmosphere of the gas through the inlet (1) to have a temperature gradient (4) shown to grow single crystals according to the manufacturing process as shown in Figure 2 according to the desired chemical composition Fe 2 Accurately weigh O 3 , MnCO 3 , and ZnO: Mix and crush the raw materials in a ball mill so that pure water and raw materials are mixed at a ratio of 1: 1.

혼합된 원료는 가압여과(Filter pressing)하여 입자의 충전율을 높여준후 150도 정도에서 건조시킨다. 건조된 상태에서 원료내부에 혼입된 불순물이나 MnCo3에서 CO2를 제거시키기 위해 1200-1300도에서 8시간정도 가소처리후 순수에 급냉시켜 소결된 원료를 쉽게 파쇄되도록 하여 파쇄한 원료는 종결정이 넣어진 도가니(5)에 장입하여 도가니 구동장치(3)를 이용해서 회전 및 상하이동으로 성장로 본체(2)내에서 종결정의이부와 원료를 용융시킨후 O2분위기에서 도가니의 회전속도는 0.5-3rpm으로하여 성장속도는 2-8㎜/hr정도로 하였다.The mixed raw materials are filtered to increase the filling rate of the particles by filter pressing and then dried at about 150 degrees. In order to remove impurities and CO 2 from MnCo 3 in the dried state, it is calcined at 1200-1300 ° C for 8 hours and then quenched in pure water so that the sintered raw materials are easily crushed. After charging into the crucible (5), and using the crucible drive device (3) to rotate and the shanghai copper melting part of the seed crystal and the raw material in the growth furnace body (2), the rotation speed of the crucible in O 2 atmosphere is 0.5 The growth rate was about 2-8 mm / hr at -3 rpm.

이와같은 제조공정에 따라 제조완료된 즉, 성장된 단결정은 결정면이 (001) (211) (111) 결정면이 되도록 결정방위를 측정하며, 그에따라 단결정블록을 가공하여 측정용시료 및 화학로성 측정용 시료등을 가공체취하여 화학조성 및 특성투자율(μ)포화자속밀도(Bs), 보자력(Hc) 전기저항등의 모든 특성을 검사하게되는데 성장된 단결정 잉고트에서 하단에서 상부로 갈수록 화학조성이 변화하게되는데 그 1실시예로 Fe2O3가 54mole%, MnCO3가 29mole%, ZnO가 17mole%인 원료에서 부터 성장된 단결정잉고트의 길이에 따른 화학조성 변화는 제3도에서 보는 바와같이 된다.The single crystal grown in accordance with this manufacturing process, ie, grown single crystal, measures the crystal orientation so that the crystal plane becomes the (001) (211) (111) crystal plane, and accordingly the single crystal block is processed to measure the sample and the chemical furnace The sample is processed to examine all properties such as chemical composition, characteristic permeability (μ), saturation flux density (Bs), and coercive force (Hc) electrical resistance.The chemical composition changes from the bottom to the top in the grown single crystal ingot. In one embodiment, the chemical composition change according to the length of the single crystal ingot grown from a raw material containing 54 mole% Fe 2 O 3 , 29 mole% MnCO 3 , and 17 mole ZnO is as shown in FIG. 3.

또한 제5도에서 보는 바와같은 투자율 측정용 시편을 사용하여 주파수 변화에 따른 투자율의 변화는 제4도에서 보는 바와같이 되며 이때 조성은 본 발명의 조성범위인바, Fe2O3가 48-58mole%, MnO은 23-35mole%, ZnO는 13-25mole%의 범위에서 화학조성을 변화시키며 투자율을 주파수 변화에 따라 도시한것이 되는것이다.In addition, the permeability change according to the frequency change using the permeability measurement specimen as shown in FIG. 5 is as shown in FIG. 4 and the composition is the composition range of the present invention, Fe 2 O 3 is 48-58mole% For example, MnO is 23-35mole% and ZnO is 13-25mole%, and the permeability is plotted according to the frequency change.

상기 조성범위로 한정하는 이유는 특히 Fe2O3가 48mole% 이하인 경우에는 저주파 특성이 낮고, 포화자속밀도가 낮게되며, Fe2O3가 58%이상이면 고주파에서의 투자율이 아주 낮아지게 되기때문이다.The reason for limiting the composition range is low frequency characteristics, low saturation magnetic flux density, especially when Fe 2 O 3 is less than 48mole%, and the permeability at high frequency becomes very low when Fe 2 O 3 is more than 58%. to be.

따라서 본 발명에 의해 제조된 Mn-Zn 페라이트 단결정은 (Mn1-x Znx) O Fe2O3로 나타낼 수 있는데 실제 Fe가 과잉으로 들어있는 소재가 좋은 특성을 갖는데 정량화학적인 상태로 가정하면(Mnx-y Znx Fey) O Fe2O3로 나타낼 수 있으며 또한 투자율은 450이상이고 전기저항은 0.2Ωcm이상이며, Ms는 4500G이상, Hx(보자력)은 0 02Oe이하인 소재를 얻게된 것이며 특히 Mn-Zn 페라이트 단결정으로 본 발명은 다결정 상태보다 우수한 특성을 갖게되는것으로 단결정은 결정입계(Grain boundary)가 없고 소재내부에 기공(Void)와 같은 내부결함이 없고 보자력(Hc)이 작으며 가공시에 깨지는 취성을 억제할 수 있게되며 크랙(Crack)이 발생하는 결함을 해소시키게 된것으로 가공성이 좋은 비데오 해드의 소재로 적합한 것이다.Therefore, the Mn-Zn ferrite single crystal prepared according to the present invention may be represented by (Mn 1- x Znx) O Fe 2 O 3 , but it is assumed that the material containing the excess Fe has good properties, but assumes a quantitative chemical state ( Mnx-y Znx Fey) O Fe 2 O 3 and the permeability is 450 or more, the electrical resistance is 0.2Ωcm or more, Ms is 4500G or more, Hx (magnetic coercivity) 0 02Oe or less, especially Mn- As Zn ferrite single crystal, the present invention has superior characteristics than polycrystalline state. Single crystal has no grain boundary, no internal defects such as voids in the material, small coercive force (Hc), and breaks during processing. It is possible to suppress the brittleness and to solve the defects that cause cracks, and it is suitable as a material of video head with good workability.

Claims (1)

원료로서 Fe2O3는 48-58 mole%, MnO는 23-25mole%, ZnO는 13-25mole%를 사용하여 순수와 1 : 1로 혼합한후 1200-1300도에서 8시간동안 가소 처리하여 단결정 성장로의 O2분위기에서 단결정 성장시키게됨을 특징으로 하는 VTR Mn-Zn 페라이트 단결정의 제조방법.As a raw material, Fe 2 O 3 was mixed with pure water and 1: 1 using 48-58 mole%, MnO 23-25mole%, and ZnO 13-25mole%, and then calcined at 1200-1300 ° C for 8 hours. A method for producing a VTR Mn-Zn ferrite single crystal characterized in that the single crystal is grown in the O 2 atmosphere of the growth furnace.
KR1019860010671A 1986-12-13 1986-12-13 Mn-zn ferrite singlecrystal manufacturing method for ctr head KR900007425B1 (en)

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