CN110511033A - 一种解决常压烧结碳化硅大板变形问题的工艺方法 - Google Patents

一种解决常压烧结碳化硅大板变形问题的工艺方法 Download PDF

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CN110511033A
CN110511033A CN201910943521.3A CN201910943521A CN110511033A CN 110511033 A CN110511033 A CN 110511033A CN 201910943521 A CN201910943521 A CN 201910943521A CN 110511033 A CN110511033 A CN 110511033A
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silicon carbide
deformation
constant pressure
big plate
pressure sintering
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王汝江
于海培
张怀顺
刘同文
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Shandong Jinhong New Material Co ltd
Institute of Quartermaster Engineering Technology Institute of Systems Engineering Academy of Military Sciences
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/565Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64Burning or sintering processes
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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    • C04B2235/656Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562Heating rate
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    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567Treatment time

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Abstract

本发明公开了一种解决常压烧结碳化硅大板变形问题的工艺方法,包括制坯、排胶和温度控制等步骤;本发明的优点在于:解决了大板成型难的问题,通过排胶处理排除了胚体内的大量胶质,清除了坯体内的应力,解决了坯体在高温烧结时变形裂纹等难题,提高了产品质量。

Description

一种解决常压烧结碳化硅大板变形问题的工艺方法
技术领域
本发明涉及一种常压烧结碳化硅大板工艺,具体地说是一种解决常压烧结碳化硅大板变形问题的工艺方法,属于碳化硅大板常压烧结工艺领域。
背景技术
目前市场上销售的碳化硅平板规格一般在(400x400x6)以下,当需要更大尺寸(600x600x6)的板时就需要采取“2拼1”的方式解决,影响了产品质量和生产效率。随着客户产品要求的提升,开发一种更大尺寸规格,平面度满足要求的碳化硅平板就显得十分必要。但规格尺寸过大的板在烧结中易变形,且烧结过程不易控制,长期以来没有得到好的解决。
发明内容
本发明的目的在于,设计了一种解决常压烧结碳化硅大板变形问题的工艺方法,解决了大板成型难的问题,通过排胶处理排除了胚体内的大量胶质,清除了坯体内的应力,解决了坯体在高温烧结时变形裂纹等难题,提高了产品质量。
本发明的技术方案为:
一种解决常压烧结碳化硅大板变形问题的工艺方法,包括以下步骤:
(1)制坯:采用干压成型的方式,将制备好的造粒料放到压力机的布料装置内送到制坯的模具内进行压制,压坯采取二次排气的压制方式,即每压制一次后排一次气;
(2)排胶:将制备好的坯体装到预烧炉内升温至900℃,在升温过程中,通过引风排胶使坯体内的胶质排出,并清除了坯体在干压过程中的应力;
(3)温度控制:为了解决大尺寸板在烧结过程中因反应造成的收缩裂纹变形,除坯体通过预烧排胶及清除应力外,在高温烧结过程中从升温曲线上进行调节1400℃-1750℃减慢了升温速度,延长了升温时间,具体升温曲线为在正常产品的升温时间的基础上延长了30%,经上述步骤获得的制品大大的减少了变形量和裂纹,并且各项技术指标得到了打大大的提高。
进一步的,所述压力机的压力1200T。
进一步的,所述正常产品的升温时间为11-12小时。
本发明的优点在于:解决了大板成型难的问题,通过排胶处理排除了胚体内的大量胶质,清除了坯体内的应力,解决了坯体在高温烧结时变形裂纹等难题,提高了产品质量。
具体实施方式
以下对本发明的优选实施例进行说明,应当理解,此处所描述的优选实施例仅用于说明和解释本发明,并不用于限定本发明。
实施例,一种解决常压烧结碳化硅大板变形问题的工艺方法,包括以下步骤:
(1)制坯:采用干压成型的方式,将制备好的造粒料放到压力机(压力1200T)的自动布料装置(常规装置)内通过自动布料送到制坯的模具内进行压制,压坯采取二次排气压制方式;
(2)排胶:将制备好的坯体装到预烧炉内升温至900℃,在升温过程中,通过引风排胶使坯体内的胶质排出,并清除了坯体在干压过程中的应力;
(3)温度控制:为了解决大尺寸板在烧结过程中因反应造成的收缩裂纹变形,除坯体通过预烧排胶及清除应力外,在高温烧结过程中从升温曲线上进行调节1400℃-1750℃减慢了升温速度,延长了升温时间,具体升温曲线为在正常产品的升温时间(11小时)的基础上延长了30%,经上述步骤获得的制品大大的减少了变形量和裂纹,并且各项技术指标得到了打大大的提高,对比试验如下:
指标 单位 本实施例 传统做法
成品变形度 5 20
成品开裂 5 15
成品密度 g/m³ 6.05 3.0
折弯程序 Mpa/m³ 280 230
从以上两个数据可以看出采用本发明所得制品比采用传统方法所得制品在密度、变形、开裂、折弯强度等方面都有大的改进,达到了预期的目的。
本发明中所用原料均为本领域生产中常用原料,均可从市场中得到,且对于生产结果不会产生影响;本发明中所采用的各种设备,均为本领域生产工艺中使用的常规设备,且各设备的操作、参数等均按照常规操作进行,并无特别之处。

Claims (3)

1.一种解决常压烧结碳化硅大板变形问题的工艺方法,其特征在于:包括以下步骤:
(1)制坯:采用干压成型的方式,将制备好的造粒料放到压力机的布料装置内送到制坯的模具内进行压制,压坯采取二次排气的压制方式,即每压制一次后排一次气;
(2)排胶:将制备好的坯体装到预烧炉内升温至900℃,在升温过程中,通过引风排胶使坯体内的胶质排出,并清除坯体在干压过程中的应力;
(3)温度控制:在高温烧结过程中从升温曲线上进行调节1400℃-1750℃减慢升温速度,具体升温曲线为在正常产品的升温时间的基础上延长30%。
2.根据权利要求1所述的一种解决常压烧结碳化硅大板变形问题的工艺方法,其特征在于:所述压力机的压力1200T。
3.根据权利要求1或2所述的一种解决常压烧结碳化硅大板变形问题的工艺方法,其特征在于:所述正常产品的升温时间为11-12小时。
CN201910943521.3A 2019-09-30 2019-09-30 一种解决常压烧结碳化硅大板变形问题的工艺方法 Pending CN110511033A (zh)

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JPH1192225A (ja) * 1997-09-16 1999-04-06 Nippon Pillar Packing Co Ltd 炭化珪素焼結体及びその製造方法
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